Dietary Patterns — Evidence Vault.

The Western dietary pattern is the engineered invisible default. Every named alternative requires literacy.

The structural pattern. In the UK and equivalent high-income countries, the unmarked dietary default — what someone eats when they make no deliberate choice — is a recognisable pattern in the peer-reviewed literature: refined grains, ultra-processed convenience products, sugar-sweetened beverages, processed and red meats above population averages, low intake of vegetables and pulses, low fibre. The pattern is engineered by the food system, marketed by the manufacturers who profit from its dominance, shelved by the retailers whose floor plan rewards it, and consumed by people who are not asked to opt in. The pattern is the noise floor.

Every named dietary pattern is, in part, a deliberate effort to escape this default. The Mediterranean diet (PREDIMED evidence, Estruch et al. 2018 NEJM) shifts toward olive oil, fish, pulses, whole grains, vegetables. DASH (Appel et al. 1997 NEJM) shifts toward vegetables, fruit, low-fat dairy, lower sodium. Plant-based patterns shift away from animal products. Low-FODMAP shifts away from specific fermentable carbohydrates for IBS-symptom management. Intermittent fasting changes when food is eaten rather than what. Ketogenic shifts toward very-low carbohydrate. Each named pattern is an articulated choice; the default is what happens when none is made.

The structural read. The food-system manufacturer engineers the default pattern; the retailer cooperates by shelving it; the consumer is positioned downstream of both. Each named alternative requires literacy to identify, effort to maintain, and access to ingredients that may sit outside the mainstream shelf. The default requires none of these. The asymmetry is the structural problem. Closing the asymmetry — through individual decoder literacy, through regulatory action on the food environment (the HFSS placement, advertising, and Soft Drinks Industry Levy interventions decoded in Impulse Buying Triggers and Reformulation Tracking), and through cultural-cuisine literacy that reaches diaspora communities specifically (Cultural Food Myths) — is the structural project the SCANSMART editorial mission sits inside.

Why "dietary patterns" is the right unit of analysis. Hu FB. Dietary pattern analysis: a new direction in nutritional epidemiology. Current Opinion in Lipidology 2002;13(1):3–9. Single-nutrient analysis (saturated fat alone, dietary cholesterol alone, sugar alone, salt alone) has produced inconsistent findings across decades of research, partly because foods and nutrients interact, partly because confounding within the dietary pattern is hard to control, partly because people eat foods and meals rather than nutrients. Whole-diet pattern analysis — either theory-driven (scoring an individual's diet against a pre-specified pattern like the Mediterranean) or data-driven (statistical extraction of patterns from observed eating data) — has produced more robust findings about diet and chronic disease risk. The peer-reviewed evidence on cardiovascular disease, type 2 diabetes, and cancer in the dietary-pattern framework is substantially more consistent than the single-nutrient evidence that preceded it.

From single-nutrient reductionism to whole-diet analysis.

For most of the twentieth century, nutritional epidemiology asked questions of the form: does nutrient X cause disease Y? Saturated fat and cardiovascular disease; dietary cholesterol and CVD; salt and hypertension; sugar and obesity; specific micronutrients and specific conditions. The single-nutrient framework produced influential public-health messages (Eatwell Guide-style "less of this, more of that") but also a substantial body of inconsistent and sometimes contradictory findings.

The dietary-pattern framework (popularised in the late 1990s and 2000s, with Hu FB and colleagues prominent among methodological contributors) treats the whole diet as the unit of analysis. Two main approaches:

Both approaches have produced consistent findings: dietary patterns characterised by whole grains, vegetables, fruit, pulses, fish, and unsaturated fats are associated with lower incidence of cardiovascular disease, type 2 diabetes, and several cancers; dietary patterns characterised by refined grains, processed meat, sugar, and ultra-processed convenience food are associated with higher incidence of the same conditions. The robustness of the dietary-pattern findings is one reason mainstream evidence-based dietary guidance has shifted toward pattern-based messaging (the EAT-Lancet planetary health diet; the 2020s Mediterranean-DASH-MIND clinical guidance for cognitive health; the WHO healthy-diet framework) and away from the single-nutrient framing that dominated the previous decades.

The methodological strength of the dietary-pattern approach: it accounts for food-food interactions (the cardiometabolic effect of olive oil in the context of a Mediterranean dietary pattern is not necessarily the same as the effect of olive oil added to a Western dietary pattern), avoids the over-specification trap of single-nutrient analysis, captures real-world dietary behaviour more accurately (people eat patterns, not isolated nutrients), and produces findings that translate more directly into practical dietary advice.

The methodological limitation: dietary-pattern findings can be confounded by the broader socio-economic and lifestyle context of the populations being studied. The Mediterranean dietary pattern is associated with cardiometabolic benefits, but the populations who adhere to it (in Mediterranean countries with traditional food cultures) also tend to have other protective lifestyle features. Disentangling the dietary-pattern effect from the broader context is methodologically challenging. The PREDIMED randomised-trial design partially addresses this; observational cohort studies are more confounded.

The default the named alternatives are trying to escape.

The "Western dietary pattern" is the most consistently-identified data-driven dietary pattern in nutritional epidemiology cohorts across high-income countries. Characterised by:

• High intake of refined grains (white bread, refined pasta, refined-flour baked goods, breakfast cereals based on refined wheat or corn)
• High intake of red and processed meats (sausages, bacon, ham, cured and smoked products)
• High intake of sugar-sweetened beverages and confectionery
• High intake of ultra-processed convenience products (ready meals, snack products, ultra-processed bakery, processed cheese products)
• Moderate-to-high intake of high-fat dairy
• Relatively low intake of whole grains, vegetables, fruit, pulses, fish, and nuts
• Modest intake of unsaturated fats from whole-food sources (olive oil, nuts, seeds)

The pattern is associated, across multiple large cohort studies, with elevated incidence of cardiovascular disease, type 2 diabetes, obesity, several cancers (notably colorectal), and all-cause mortality (Hu FB et al. multiple papers; Fung TT et al. multiple papers; Schulze MB and colleagues; Mediterranean-comparison studies; the EPIC cohort programme). The evidence is observational and the confounding caveats are real, but the magnitude and consistency of the associations across populations, methods, and outcomes are substantial.

Quantitative anchors: the EAT-Lancet Commission analysis (Willett W, Rockström J, Loken B, et al. Food in the Anthropocene: the EAT-Lancet Commission on healthy diets from sustainable food systems. Lancet 2019;393(10170):447–492) estimated that a global shift from the prevailing Western-style dietary pattern toward a planetary-health-aligned dietary pattern could avert approximately 10.8–11.6 million premature deaths per year globally. Springmann M et al. (Options for keeping the food system within environmental limits. Nature 2018;562:519–525) estimated similar magnitudes through different analytic approaches. The peer-reviewed estimates of avoidable burden from dietary-pattern improvement are among the largest in chronic-disease epidemiology.

Why it is the default. The Western dietary pattern is what someone eats when they make no deliberate choice in a UK or equivalent high-income food environment. The refined grain is the default in the bread aisle. The ultra-processed convenience product is the default at the ready-meal section. The sugar-sweetened beverage is the default at the chilled-drinks fridge. The processed meat is the default at the deli counter. The consumer can choose otherwise — whole-grain bread, fresh-cooked meal, water, fresh meat — but choosing otherwise requires literacy, effort, and access. Choosing the default requires none of these.

The food-system manufacturer benefits from this asymmetry. Ultra-processed convenience products have longer shelf life, higher margins, more brand differentiation, and more advertising spend behind them than whole, fresh, unbranded alternatives. The same multinational manufacturers that drive the nutrition transition in low- and middle-income countries (decoded in Cultural Food Myths) maintain the Western dietary pattern in high-income countries through the same product-and-marketing system. The retailer cooperates by shelving the engineered default (decoded in Impulse Buying Triggers); the digital shelf migrates the same pattern (Maryland HB 895 of May 2026 and equivalent international precedent address one dimension of this).

Every named dietary pattern decoded below is, in part, a structured exit route from this default.

UK 2026: what dietary claims are regulated, what's not.

How to read the map. The UK regulates specific nutrition claims and health claims tightly (EFSA register); regulates clinical-dietary claims tightly (FSMP / MHRA); and regulates diet brand-name claims loosely (mostly voluntary industry standards). Public dietary guidance is published but not enforced. NPM-linked statutory policy operates as the regulatory backstop on the worst features of the Western dietary pattern. The shopper navigating named dietary patterns operates in a regulatory landscape that is tight at the specific-claim level and loose at the whole-pattern level. The structural decoder-literacy move is to read the ingredient list and nutrition declaration of each product (regulated, verifiable) rather than the named-diet front-of-pack claim (mostly unregulated marketing).

The most-studied named dietary pattern in nutritional epidemiology.

Primary source. Estruch R, Ros E, Salas-Salvadó J, Covas MI, Corella D, Arós F, Gómez-Gracia E, Ruiz-Gutiérrez V, Fiol M, Lapetra J, Lamuela-Raventós RM, Serra-Majem L, Pintó X, Basora J, Muñoz MA, Sorlí JV, Martínez JA, Fitó M, Gea A, Hernán MA, Martínez-González MA, PREDIMED Study Investigators. Primary prevention of cardiovascular disease with a Mediterranean diet supplemented with extra-virgin olive oil or nuts. New England Journal of Medicine 2018;378(25):e34. (Retracted-and-republished from the 2013 original following identification of statistical issues; the republished analysis with corrected methods produced consistent findings.)

What it is. A dietary pattern based on the traditional eating habits of Mediterranean-rim populations — not only Italian and Greek cuisines but also Spanish, southern French, Lebanese, Syrian, Turkish, Egyptian, Tunisian, Algerian, Moroccan, Israeli, and Sephardi Jewish traditions (see cultural-accuracy note in Cultural Food Myths). The defining features:

• Extra-virgin olive oil as the principal added fat (target: approximately 4 tablespoons per day in PREDIMED protocols)
• High intake of vegetables (3+ servings per day), fruits (3+ servings per day), pulses (3+ servings per week), whole grains, nuts (3+ servings per week), and seeds
• Moderate intake of fish and seafood (3+ servings per week)
• Modest intake of poultry, eggs, and fermented dairy (yogurt, cheese)
• Limited intake of red and processed meats (less than 1 serving per day; lower for processed)
• Modest intake of wine with meals (in cultural traditions that include it; 1 glass per day for women, 2 for men in PREDIMED)
• Minimal intake of refined grains, sugar-sweetened products, and ultra-processed convenience foods

What the evidence supports. PREDIMED was a randomised controlled trial of approximately 7,400 high-cardiovascular-risk Spanish adults randomised to one of three dietary advice arms: Mediterranean diet with olive oil supplementation; Mediterranean diet with nut supplementation; low-fat control. Median follow-up of approximately 4.8 years. Findings:

• Mediterranean diet with extra-virgin olive oil: reduced incidence of major cardiovascular events (composite of myocardial infarction, stroke, cardiovascular death) by approximately 30% compared with the low-fat control arm.
• Mediterranean diet with nuts: reduced incidence of major cardiovascular events by approximately 28% compared with the low-fat control arm.
• Effects on stroke specifically were particularly substantial in the Mediterranean arms.
• Effects on blood pressure, lipid profile, and other intermediate cardiometabolic markers were consistent with the cardiovascular-event findings.

Subsequent observational cohort studies (PREDIMED-Plus extending the original cohort; multiple cohorts internationally including the Lyon Diet Heart Study, the Greek EPIC cohort, the US Nurses' Health Study sub-analyses) and meta-analyses consistently associate Mediterranean dietary patterns with reduced incidence of cardiovascular disease, type 2 diabetes, several cancers, and all-cause mortality, and with reduced cognitive decline in some studies. The Mediterranean dietary pattern has the largest peer-reviewed evidence base of any named dietary pattern in nutritional epidemiology.

The MIND diet variant. Mediterranean-DASH Intervention for Neurodegenerative Delay (Morris MC, Tangney CC, Wang Y, Sacks FM, Bennett DA, Aggarwal NT. MIND diet associated with reduced incidence of Alzheimer's disease. Alzheimer's & Dementia 2015;11(9):1007–1014). A hybrid pattern combining Mediterranean and DASH features with specific emphasis on foods documented to be associated with cognitive health (leafy greens, berries, nuts, olive oil, whole grains, fish, beans). Observational evidence on cognitive-decline outcomes; further trials are in progress.

Cultural-accuracy note. The popular UK and US conflation of "Mediterranean diet" with Italian-and-Greek food only is decoded in Cultural Food Myths. The original peer-reviewed framework (Keys A and the Seven Countries Study from the 1960s; PREDIMED) is broader. The Levantine, North African, and Sephardi traditions are central to the original framework but typically absent from the popular UK image.

Dietary Approaches to Stop Hypertension: the blood-pressure-evidence pattern.

Primary sources. Appel LJ, Moore TJ, Obarzanek E, Vollmer WM, Svetkey LP, Sacks FM, Bray GA, Vogt TM, Cutler JA, Windhauser MM, Lin PH, Karanja N, DASH Collaborative Research Group. A clinical trial of the effects of dietary patterns on blood pressure. New England Journal of Medicine 1997;336(16):1117–1124. Sacks FM, Svetkey LP, Vollmer WM, Appel LJ, Bray GA, Harsha D, Obarzanek E, Conlin PR, Miller ER 3rd, Simons-Morton DG, Karanja N, Lin PH, DASH-Sodium Collaborative Research Group. Effects on blood pressure of reduced dietary sodium and the Dietary Approaches to Stop Hypertension (DASH) diet. New England Journal of Medicine 2001;344(1):3–10.

What it is. A dietary pattern designed in the 1990s by US National Heart, Lung, and Blood Institute researchers to test the effect of whole-diet patterns on blood pressure. The defining features:

• High intake of vegetables and fruit (4–5 servings of each per day)
• Low-fat or fat-free dairy (2–3 servings per day)
• Whole grains (6–8 servings per day depending on energy needs)
• Lean protein sources (fish, poultry, pulses, nuts; less than 6 oz per day of lean meat, poultry, and fish; 4–5 servings per week of nuts, seeds, or legumes)
• Limited red meat and added sugars (less than 5 servings per week of sweets)
• Lower sodium intake (the DASH-Sodium variant tested progressively lower sodium levels: 3,300 mg/day, 2,300 mg/day, and 1,500 mg/day)

What the evidence supports. The original DASH trial showed substantial reductions in blood pressure with the DASH dietary pattern compared with a typical American diet: 5.5 mmHg systolic / 3.0 mmHg diastolic reduction in the full DASH-pattern arm in the overall participant population, with substantially larger reductions in hypertensive participants (11.4 / 5.5 mmHg in hypertensive participants in some subgroup analyses). The DASH-Sodium follow-up showed further reductions when sodium intake was reduced alongside the dietary pattern, with the maximum effect achieved at the lowest sodium intake (1,500 mg/day) combined with the DASH pattern.

The DASH pattern remains a reference dietary intervention for blood pressure in NICE NG136 (Hypertension in adults), in NHS dietary advice, and in international hypertension guidance from the American Heart Association, European Society of Hypertension, and equivalent national bodies.

DASH and Mediterranean: overlap and complement. The DASH pattern and the Mediterranean pattern overlap substantially in their emphasis on vegetables, fruit, whole grains, pulses, and lean protein. The differences are in fat profile (DASH emphasises low-fat dairy; Mediterranean emphasises olive oil) and in cultural origin (DASH is a designed pattern; Mediterranean is a traditional cuisine-based pattern). Many people find the patterns are easier to follow when treated as overlapping rather than as mutually exclusive. The MIND diet (described above) is an explicit Mediterranean-DASH hybrid.

The plant-forward spectrum and what the evidence says.

"Plant-based" is a spectrum rather than a single pattern. The peer-reviewed and clinical literature distinguishes several positions on the spectrum:

The Satija critical insight. Satija A, Bhupathiraju SN, Spiegelman D, Chiuve SE, Manson JE, Willett W, Rexrode KM, Rimm EB, Hu FB. Healthful and unhealthful plant-based diets and the risk of coronary heart disease in U.S. adults. Journal of the American College of Cardiology 2017;70(4):411–422. Found that plant-based dietary patterns rich in healthful plant foods (whole grains, fruits, vegetables, nuts, pulses) were associated with substantially lower CHD risk, while plant-based dietary patterns rich in less-healthful plant foods (refined grains, sugar-sweetened beverages, sweets) were associated with higher CHD risk. The "plant-based" label alone does not distinguish; the food-quality dimension within the plant-based pattern matters substantially.

Position papers from major dietetic associations. Melina V, Craig W, Levin S. Position of the Academy of Nutrition and Dietetics: Vegetarian Diets. Journal of the Academy of Nutrition and Dietetics 2016;116(12):1970–1980. The Academy of Nutrition and Dietetics, the British Dietetic Association, and equivalent professional bodies confirm that well-planned vegetarian and vegan diets are nutritionally adequate at all life stages including pregnancy, infancy, childhood, adolescence, older adulthood, and athletic populations, provided specific nutrient attention is given.

Cross-cultural note. Many of the world's traditional cuisines are structurally plant-forward (South Asian Hindu and Jain vegetarian traditions; Buddhist vegetarian traditions in East Asia; many traditional African and Latin American cuisines with modest meat consumption; Mediterranean and Levantine vegetable-and-pulse-rich traditions; traditional Caribbean root-vegetable-and-pulse-rich cuisines). The "plant-based" framing is sometimes presented as a Western lifestyle innovation when much of its substantive content is the rediscovery of these long-standing traditional patterns. Decoded in detail in Cultural Food Myths.

An IBS-specific clinical-dietary pattern, not a general healthy-eating diet.

Primary source. Halmos EP, Power VA, Shepherd SJ, Gibson PR, Muir JG. A diet low in FODMAPs reduces symptoms of irritable bowel syndrome. Gastroenterology 2014;146(1):67–75.

The framework was developed at Monash University (Australia) by Professor Peter Gibson, Dr Sue Shepherd, and colleagues and is the most-evidence-supported dietary intervention for irritable bowel syndrome (IBS) symptom management. The Monash University FODMAP framework is the canonical international reference and is the basis for clinical implementation in UK dietetic practice and internationally.

What it is. A clinical-dietary pattern that restricts fermentable oligosaccharides, disaccharides, monosaccharides, and polyols (the FODMAPs) for a defined period (typically 2–6 weeks elimination), followed by structured reintroduction to identify individual triggers, followed by a personalised long-term low-FODMAP-of-the-relevant-trigger maintenance phase. FODMAPs are short-chain carbohydrates poorly absorbed in the small intestine that ferment in the large intestine and can trigger IBS symptoms (bloating, abdominal pain, altered bowel habit) in susceptible individuals.

Common high-FODMAP foods include onion (high in fructans), garlic (high in fructans), wheat (high in fructans; relevant for IBS-non-coeliac sub-populations), milk (high in lactose for lactase-non-persistent individuals), some legumes (high in galactooligosaccharides), some stone fruits (high in polyols), apples and pears (high in fructose and polyols), watermelon (high in fructose, fructans, polyols), sweeteners ending in -ol (sorbitol, mannitol, xylitol, maltitol — polyols), and certain prebiotic ingredients (inulin, chicory root extract).

What the evidence supports. The peer-reviewed evidence supports low-FODMAP as effective for IBS symptom management in approximately 50–80% of patients in clinical trials (variation reflects trial design and outcome measure). Multiple systematic reviews and meta-analyses (Marsh A, Eslick EM, Eslick GD. Does a diet low in FODMAPs reduce symptoms associated with functional gastrointestinal disorders? A comprehensive systematic review and meta-analysis. European Journal of Nutrition 2016;55(3):897–906; and successors) have confirmed the finding. Low-FODMAP is the dietary intervention with the strongest evidence base for IBS symptom management currently available.

Important framing for non-IBS populations. Low-FODMAP is not a general healthy-eating diet. It is a clinical-dietary tool for IBS-symptom management. Many of the foods restricted in the elimination phase (onion, garlic, legumes, some fruits) are health-supporting for the general population and should not be removed long-term outside the clinical indication. Low-FODMAP should be implemented with registered-dietitian or clinical-team guidance, particularly through the reintroduction phase, to avoid unnecessary long-term restriction. The Monash University FODMAP framework explicitly emphasises this three-phase structure (elimination, reintroduction, personalised maintenance) and warns against indefinite elimination-phase restriction.

The popular media positioning of low-FODMAP as a general healthy-eating diet is a misframing of the clinical evidence base. The diet has a specific indication (IBS, with some emerging evidence in functional dyspepsia and small intestinal bacterial overgrowth) and is not intended for general population use. NICE CG61 (Irritable Bowel Syndrome in adults: diagnosis and management) provides the UK clinical guidance.

The pattern that changes when rather than what.

Primary sources. Patterson RE, Sears DD. Metabolic effects of intermittent fasting. Annual Review of Nutrition 2017;37:371–393. de Cabo R, Mattson MP. Effects of intermittent fasting on health, aging, and disease. New England Journal of Medicine 2019;381(26):2541–2551. Varady KA, Cienfuegos S, Ezpeleta M, Gabel K. Cardiometabolic Benefits of Intermittent Fasting. Annual Review of Nutrition 2021;41:333–361.

What it is. A family of eating patterns defined by when food is consumed rather than (only) what:

• Time-restricted eating (TRE) — daily eating confined to a defined window, typically 8–12 hours, with the remaining hours as a daily fasting period. The "16:8" pattern (16 hours fasting, 8 hours eating) is widely popularised. The "14:10" and "12:12" patterns are more moderate variants.
• Alternate-day fasting (ADF) — alternating between a normal-intake day and a substantially-reduced-intake (often ~25% of usual) day. The modified ADF approach uses very-low-calorie "fasting" days (approximately 500 kcal) rather than complete fasting.
• 5:2 fasting — five days of normal intake and two days of substantially reduced intake (approximately 500–600 kcal) per week. Popularised in the UK by Michael Mosley and colleagues.
• Periodic prolonged fasting — longer fasts of 24–72 hours implemented occasionally rather than weekly. Less common as a sustained practice.

What the evidence supports. The peer-reviewed evidence base on intermittent fasting and time-restricted eating has expanded substantially in the 2010s and 2020s. Findings to date suggest:

• Modest weight loss in time-restricted eating compared with unrestricted eating, often comparable to continuous calorie restriction (the weight-loss effect appears to operate predominantly through reduced overall calorie intake rather than through fasting-specific metabolic mechanisms).
• Improvements in insulin sensitivity and some cardiometabolic markers in some populations.
• Some evidence of metabolic-pathway effects (autophagy, ketone metabolism) at longer fasting durations, though direct human-outcome evidence is still developing.
• The effects depend substantially on what is eaten in the eating window: time-restricted eating of an ultra-processed Western dietary pattern does not produce the same outcomes as time-restricted eating of a Mediterranean or DASH-style pattern.
• Recent randomised trials (notably Varady KA et al. work and the TREATY-2 trial in 2022) have shown more modest effects than initial enthusiasm suggested; the gap between popular framing and rigorous evidence is substantial.

Cautions. Intermittent fasting is not appropriate for pregnancy, lactation, history of disordered eating, type 1 diabetes (without specialist guidance and continuous glucose monitoring), in children and adolescents, in adults with significantly underweight BMI, or in adults on medications that require regular food intake. The popular wellness-press positioning of intermittent fasting as universally beneficial overstates the evidence; the clinical evidence base supports specific applications in specific populations under appropriate guidance, not a general population recommendation. NICE has not issued specific guidance on intermittent fasting at time of writing; for clinical applications, registered-dietitian input is the appropriate route.

From paediatric epilepsy treatment to popular weight-loss diet.

Primary sources. Bueno NB, de Melo IS, de Oliveira SL, da Rocha Ataide T. Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis of randomised controlled trials. British Journal of Nutrition 2013;110(7):1178–1187. Kossoff EH, Zupec-Kania BA, Auvin S, Ballaban-Gil KR, Bergqvist AGC, Blackford R, Buchhalter JR, Caraballo RH, Cross JH, Dahlin MG, Donner EJ, Guzel O, Jehle RS, Klepper J, Kang HC, Lambrechts DA, Liu YMC, Nathan JK, Nordli DR Jr, Pfeifer HH, Rho JM, Scheffer IE, Sharma S, Stafstrom CE, Thiele EA, Turner Z, Vaccarezza MM, van der Louw EJTM, Veggiotti P, Wheless JW, Wirrell EC, Charlie Foundation, Matthew's Friends, Practical Committee of the Child Neurology Society. Optimal clinical management of children receiving dietary therapies for epilepsy: Updated recommendations of the International Ketogenic Diet Study Group. Epilepsia Open 2018;3(2):175–192.

What it is. A very-low-carbohydrate, high-fat dietary pattern that induces ketosis — a metabolic state in which the body uses fatty acids and ketone bodies (derived from fat) as primary fuel rather than glucose. Typical macronutrient distribution: approximately 70–75% of energy from fat, 20–25% from protein, 5–10% from carbohydrate (with carbohydrate intake often constrained to less than 50g per day, sometimes less than 20g for "strict" ketogenic protocols).

Clinical history. The ketogenic diet was developed at the Mayo Clinic in the 1920s as a treatment for paediatric epilepsy. The evidence base for ketogenic dietary therapy in childhood-onset refractory epilepsy is substantial and ongoing; ketogenic diets remain a recognised clinical intervention in this specific indication, typically managed by specialist neurology and dietetic teams using formalised protocols (classic ketogenic diet; medium-chain triglyceride diet; modified Atkins diet; low glycaemic index treatment). The 2018 International Ketogenic Diet Study Group consensus paper is the canonical clinical reference.

Popular weight-loss and metabolic-health use. The wider popular use of ketogenic diets for weight loss and metabolic health gained prominence in the 2010s. The peer-reviewed evidence base on ketogenic diets for weight loss shows: modest weight-loss superiority over low-fat comparison diets in some shorter-term trials (Bueno 2013 meta-analysis; Hu T et al. trials and meta-analyses); comparable outcomes in many longer-term comparisons (effects narrow at 12+ months); substantial individual variation in adherence and response; emerging evidence on insulin-resistance and type-2-diabetes glycaemic-control applications (notably the Virta Health trial series and equivalent work by Westman EC and colleagues).

Cautions. Ketogenic diets restrict whole-food groups (whole grains, most fruit, pulses, many vegetables) that the peer-reviewed dietary-pattern literature consistently associates with cardio-protective outcomes. The trade-off — weight loss or glycaemic benefit at the cost of dietary-pattern restriction — is real and individual-dependent. Long-term cardiovascular and all-cause mortality outcomes on sustained ketogenic dietary patterns are less well-established than for Mediterranean or DASH patterns. Not appropriate in pregnancy, lactation, or in conjunction with certain medications (notably SGLT2 inhibitors, which carry an elevated diabetic ketoacidosis risk in combination with ketogenic dietary patterns) without clinical supervision.

Lipid profile considerations. Ketogenic diets typically produce reductions in triglycerides and modest increases in HDL cholesterol, but the LDL-cholesterol response is variable — some individuals show substantial LDL elevation (the "lean mass hyper-responder" phenomenon has been described in some lean ketogenic adherents). Periodic lipid monitoring is appropriate for sustained ketogenic adherence, particularly in individuals with pre-existing cardiovascular risk factors.

Two patterns with weaker evidence bases that warrant careful framing.

Paleo (palaeolithic) diet.

A dietary pattern based on the proposed (and debated) eating habits of pre-agricultural human populations: meat, fish, eggs, vegetables, fruit, nuts, seeds; excluding grains, legumes, dairy, refined sugar, and processed foods. The original peer-reviewed framing (Eaton SB, Konner M. Paleolithic nutrition. A consideration of its nature and current implications. New England Journal of Medicine 1985;312(5):283–289) proposed dietary-evolutionary-mismatch as a framework for understanding modern chronic disease.

The peer-reviewed evidence on contemporary paleo dietary patterns is more limited than for Mediterranean, DASH, or plant-based. Short-to-medium-term studies (multiple, with mixed methodological quality) suggest weight loss and some cardiometabolic improvements; longer-term outcome data is less developed. The exclusion of whole grains and legumes (which the broader dietary-pattern literature consistently supports as cardio-protective) is the most substantive scientific objection to paleo as a long-term pattern. Within-paleo variation is substantial; the framework is more an evolutionary-mismatch rationale than a fixed dietary pattern. The popular paleo space (cookbooks, branded products, online communities) has often diverged from the original peer-reviewed framework.

Carnivore diet.

An animal-product-only dietary pattern, popularised in the 2010s and 2020s through social media and specific commercial influencers. The peer-reviewed evidence base on carnivore-only dietary patterns as a long-term eating pattern is essentially absent. Most peer-reviewed dietary-pattern frameworks identify the carnivore pattern as substantially different from any pattern associated with cardio-protective outcomes; the absence of vegetables, fruit, whole grains, pulses, nuts, and seeds removes most of the food groups the dietary-pattern literature finds protective.

One descriptive observational study has been published (Lennerz BS, Mey JT, Henn OH, Ludwig DS. Behavioral Characteristics and Self-Reported Health Status among 2029 Adults Consuming a "Carnivore Diet". Current Developments in Nutrition 2021;5(12):nzab133), based on self-reported survey data with substantial sampling-bias caveats (recruited from carnivore-diet online communities; no controlled comparison; self-reported outcomes). The study reports favourable self-reported outcomes but does not establish causal claims and does not constitute clinical-trial evidence.

The popular claims around the carnivore diet largely rest on anecdote, social-media testimony, and selected single-case-report-style evidence. Long-term safety and outcome data is absent. The framing in this brief is correspondingly cautious: this is a pattern with a substantial wellness-press following and minimal peer-reviewed evidence base. The structural critique applies in reverse: the popular wellness market routinely overclaims for dietary patterns with sparse evidence and underclaims for patterns (Mediterranean, DASH, whole-food plant-based) with substantial evidence.

The longer history of carbohydrate restriction.

"Low-carbohydrate" is a broad category covering dietary patterns from ketogenic (very low carb, <50g/day typically) through Atkins-style (very low carb in initial phase, increasing in subsequent phases) to general "lower-carb" patterns that simply emphasise reduced refined-carbohydrate intake. The 1972 Atkins Diet Revolution (Robert Atkins, popular-press) anchored a long lineage of low-carbohydrate dietary writing; the four-phase Atkins protocol (Induction, Ongoing Weight Loss, Pre-Maintenance, Maintenance) has been substantially commercialised and remains a recognisable popular pattern.

The peer-reviewed evidence on low-carbohydrate dietary patterns (Halton TL, Hu FB. The effects of high protein diets on thermogenesis, satiety and weight loss: a critical review. Journal of the American College of Nutrition 2004;23(5):373–385; multiple subsequent trials and meta-analyses including the DIETFITS study, Gardner CD et al. 2018 JAMA) supports modest weight loss in short-to-medium-term trials, with comparable long-term outcomes to other calorie-equivalent dietary patterns in most comparisons. The carbohydrate-quality framing (Reynolds 2019 Lancet) suggests the relevant distinction is not low-carb-versus-high-carb but rather refined-carb-versus-whole-grain-and-fibre.

The popular low-carb space includes substantial commercial product activity (low-carb breads, low-carb pasta, low-carb snack products) much of which is ultra-processed despite the "diet" framing. The decoder-literacy move applies: read the ingredient list of the low-carb product, not the front-of-pack low-carb claim. Decoded in more depth in Carbohydrate Types.

The named diets the peer-reviewed literature has caught up with.

Several traditional cuisine-anchored dietary patterns have substantial peer-reviewed evidence behind them, each representing the discovery (in nutrition-science terms) of patterns that have anchored populations for centuries:

The structural insight. The "discovered" cuisine-anchored patterns share substantial structural overlap: vegetables, pulses, whole grains, fish, traditional fats in moderation, modest meat and dairy, fermented foods. Different traditions arrive at the cardio-protective pattern through different ingredient selections; the underlying pattern is convergent. The nutrition transition out of any of these traditional patterns into the Westernised ultra-processed pattern is the documented public-health problem. The "rediscovery" of traditional dietary patterns in peer-reviewed nutrition science over the last two decades has been one of the major shifts in the dietary-advice landscape.

Four live tensions in the dietary-pattern literature.

1. Adherence versus efficacy.

Many dietary patterns show comparable outcomes when sustained but very different real-world results because of substantial differences in adherence. The pattern that an individual can sustain for years matters more than the pattern that is theoretically optimal at the trial level. Long-term adherence data consistently shows substantial drop-out and reversion across all named dietary patterns; the choice of pattern is therefore as much an adherence-prediction question as an efficacy question. The DIETFITS study (Gardner CD, Trepanowski JF, Del Gobbo LC, et al. Effect of Low-Fat vs Low-Carbohydrate Diet on 12-Month Weight Loss in Overweight Adults and the Association With Genotype Pattern or Insulin Secretion. JAMA 2018;319(7):667–679) found comparable 12-month weight loss between low-fat and low-carbohydrate diets, with substantial individual variation within each arm, suggesting the choice between healthful low-fat and healthful low-carb patterns may be less important than the within-pattern food-quality dimension.

2. Within-pattern variation.

"Plant-based" can be Mediterranean-style or UPF-heavy; "ketogenic" can be whole-food or processed-meat-heavy; "Mediterranean" can be home-cooked-traditional or restaurant-and-shop-substitute. The within-pattern variation often exceeds the between-pattern differences in food quality. The Satija 2017 JACC work on healthful versus less-healthful plant-based patterns demonstrated this directly; the same logic applies to most named patterns. The "healthful versus less-healthful" within-pattern distinction may be more predictive of cardiometabolic outcomes than the between-pattern label.

3. Population specificity.

The peer-reviewed dietary-pattern literature is dominated by studies in European-ancestry populations in high-income countries. The generalisability of dietary-pattern findings to diaspora-community, low-income, and developing-country populations is real but qualified; the SABRE-documented cardiometabolic differential (Tillin et al. 2013; decoded in Cultural Food Myths) is one example of how within-country diaspora populations carry different risk profiles from the predominantly European-ancestry cohorts the dietary-pattern evidence is largely drawn from. Population-specific dietary-pattern research is a growing area but remains less developed than the mainstream literature.

4. Personalised nutrition and individual variation.

Zeevi D, Korem T, Zmora N, et al. Personalized nutrition by prediction of glycemic responses. Cell 2015;163(5):1079–1094 documented substantial inter-individual variation in glycaemic response to the same foods, related to gut-microbiome composition, anthropometry, and other factors. The subsequent personalised-nutrition commercial space has expanded substantially; the peer-reviewed evidence on whether personalised dietary advice based on glycaemic-response profiling or microbiome analysis produces better outcomes than standard whole-grain-and-fibre-emphasised advice is still being mapped. The PREDICT studies (Berry SE et al.) and equivalent work are extending this evidence base. The honest reading: substantial individual variation is real; the practical translation into personalised-dietary-advice products is still in development.

What to spot at the shelf and in the dietary advice you encounter.

At the shelf.

1. Read the ingredient list, not the diet name on the front. "Keto-friendly", "Mediterranean-style", "plant-based", "vegan", "DASH-compatible", "paleo" are mostly unregulated marketing claims (with limited exceptions for "vegan" voluntary industry standards). The ingredient list and the nutrition declaration are the regulated, verifiable data.
2. The Western dietary pattern is the default; deliberate choice is the alternative. Building a different pattern requires noticing what the default is doing.
3. For named patterns, the structural rules (whole vs refined; minimal vs ultra-processed) are typically more important than the diet-name claim on the front. A vegan UPF burger is closer structurally to a Western-pattern UPF product than to a whole-food plant-based meal. A "Mediterranean-style" ready meal with multiple ultra-processed ingredients is closer to the Western-pattern ready meal than to a home-cooked traditional Mediterranean dish.
4. Read claim density. A product carrying multiple diet-name claims simultaneously ("keto-and-paleo-and-Mediterranean") is typically a marketing artefact rather than a substantive nutritional positioning.

In dietary advice.

5. Distinguish clinical-indication patterns from general dietary patterns. Low-FODMAP is for IBS, not for general healthy eating. Ketogenic dietary therapy is for refractory paediatric epilepsy as a clinical indication; popular ketogenic dieting is a separate use case. FSMP-classified products require specific clinical indications.
6. Recognise the trial-versus-real-world gap. Most peer-reviewed dietary-pattern evidence comes from controlled trials and observational cohorts. The translation into individual dietary practice involves substantial adherence, context, and access variables that the trial-level evidence does not capture.
7. Treat overclaim with scepticism. If a popular dietary pattern is claimed to address weight loss, cardiovascular health, type 2 diabetes, mental health, longevity, and several cancers simultaneously, that is typically a marketing artefact rather than a peer-reviewed finding. The peer-reviewed dietary-pattern literature is more measured.
8. Seek qualified guidance for clinical indications. Any dietary pattern adopted for a specific clinical condition (diabetes, IBS, hypertension, kidney disease, food allergy, eating disorder recovery, paediatric or pregnancy contexts) should involve registered-dietitian or appropriate clinical-team input. This brief is educational-register literacy, not clinical-decision-support.

The structural decoder move.

9. Name the Western dietary pattern. Recognising that there is an unmarked default, that it is engineered by the food system, and that it is what happens when no choice is made — that is the first structural move. Every named alternative requires literacy and effort; the default requires neither. Naming the default is half the work.
10. Cross-link to the cuisine you come from. Many traditional cuisines (Mediterranean, Okinawan, South Asian, African, Caribbean, Latin American, Middle Eastern, Nordic in their pre-industrialisation forms) are already broadly aligned with the peer-reviewed cardio-protective dietary patterns. The cultural-cuisine path back to a traditional dietary pattern is often more practical than the named-Western-diet path to the equivalent endpoint. Decoded in Cultural Food Myths.

Copy-paste-ready primary sources.

1. Appel LJ, Moore TJ, Obarzanek E, Vollmer WM, Svetkey LP, Sacks FM, Bray GA, Vogt TM, Cutler JA, Windhauser MM, Lin PH, Karanja N, DASH Collaborative Research Group. A clinical trial of the effects of dietary patterns on blood pressure. New England Journal of Medicine 1997;336(16):1117–1124.
2. Aune D, Keum N, Giovannucci E, Fadnes LT, Boffetta P, Greenwood DC, Tonstad S, Vatten LJ, Riboli E, Norat T. Whole grain consumption and risk of cardiovascular disease, cancer, and all cause and cause specific mortality. BMJ 2016;353:i2716.
3. Bueno NB, de Melo IS, de Oliveira SL, da Rocha Ataide T. Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis of randomised controlled trials. British Journal of Nutrition 2013;110(7):1178–1187.
4. de Cabo R, Mattson MP. Effects of intermittent fasting on health, aging, and disease. New England Journal of Medicine 2019;381(26):2541–2551.
5. Dinu M, Abbate R, Gensini GF, Casini A, Sofi F. Vegetarian, vegan diets and multiple health outcomes: a systematic review with meta-analysis of observational studies. Critical Reviews in Food Science and Nutrition 2017;57(17):3640–3649.
6. Eaton SB, Konner M. Paleolithic nutrition. A consideration of its nature and current implications. New England Journal of Medicine 1985;312(5):283–289.
7. Estruch R, Ros E, Salas-Salvadó J, et al. Primary prevention of cardiovascular disease with a Mediterranean diet supplemented with extra-virgin olive oil or nuts. New England Journal of Medicine 2018;378(25):e34 (retracted-and-republished from 2013).
8. Gardner CD, Trepanowski JF, Del Gobbo LC, Hauser ME, Rigdon J, Ioannidis JPA, Desai M, King AC. Effect of Low-Fat vs Low-Carbohydrate Diet on 12-Month Weight Loss in Overweight Adults and the Association With Genotype Pattern or Insulin Secretion: The DIETFITS Randomized Clinical Trial. JAMA 2018;319(7):667–679.
9. Halmos EP, Power VA, Shepherd SJ, Gibson PR, Muir JG. A diet low in FODMAPs reduces symptoms of irritable bowel syndrome. Gastroenterology 2014;146(1):67–75.
10. Halton TL, Hu FB. The effects of high protein diets on thermogenesis, satiety and weight loss: a critical review. Journal of the American College of Nutrition 2004;23(5):373–385.
11. Hu FB. Dietary pattern analysis: a new direction in nutritional epidemiology. Current Opinion in Lipidology 2002;13(1):3–9.
12. Kossoff EH, Zupec-Kania BA, Auvin S, et al. Optimal clinical management of children receiving dietary therapies for epilepsy: Updated recommendations of the International Ketogenic Diet Study Group. Epilepsia Open 2018;3(2):175–192.
13. Marsh A, Eslick EM, Eslick GD. Does a diet low in FODMAPs reduce symptoms associated with functional gastrointestinal disorders? A comprehensive systematic review and meta-analysis. European Journal of Nutrition 2016;55(3):897–906.
14. Melina V, Craig W, Levin S. Position of the Academy of Nutrition and Dietetics: Vegetarian Diets. Journal of the Academy of Nutrition and Dietetics 2016;116(12):1970–1980.
15. Morris MC, Tangney CC, Wang Y, Sacks FM, Bennett DA, Aggarwal NT. MIND diet associated with reduced incidence of Alzheimer's disease. Alzheimer's & Dementia 2015;11(9):1007–1014.
16. Patterson RE, Sears DD. Metabolic effects of intermittent fasting. Annual Review of Nutrition 2017;37:371–393.
17. Reynolds A, Mann J, Cummings J, Winter N, Mete E, Te Morenga L. Carbohydrate quality and human health: a series of systematic reviews and meta-analyses. Lancet 2019;393(10170):434–445.
18. Sacks FM, Svetkey LP, Vollmer WM, Appel LJ, Bray GA, Harsha D, Obarzanek E, Conlin PR, Miller ER 3rd, Simons-Morton DG, Karanja N, Lin PH, DASH-Sodium Collaborative Research Group. Effects on blood pressure of reduced dietary sodium and the Dietary Approaches to Stop Hypertension (DASH) diet. New England Journal of Medicine 2001;344(1):3–10.
19. Satija A, Bhupathiraju SN, Spiegelman D, Chiuve SE, Manson JE, Willett W, Rexrode KM, Rimm EB, Hu FB. Healthful and unhealthful plant-based diets and the risk of coronary heart disease in U.S. adults. Journal of the American College of Cardiology 2017;70(4):411–422.
20. Springmann M, Clark M, Mason-D'Croz D, Wiebe K, Bodirsky BL, Lassaletta L, de Vries W, Vermeulen SJ, Herrero M, Carlson KM, Jonell M, Troell M, DeClerck F, Gordon LJ, Zurayk R, Scarborough P, Rayner M, Loken B, Fanzo J, Godfray HCJ, Tilman D, Rockström J, Willett W. Options for keeping the food system within environmental limits. Nature 2018;562(7728):519–525.
21. Tillin T, Hughes AD, Mayet J, Whincup P, Sattar N, Forouhi NG, McKeigue PM, Chaturvedi N. The relationship between metabolic risk factors and incident cardiovascular disease in Europeans, South Asians, and African Caribbeans: SABRE (Southall And Brent REvisited). Journal of the American College of Cardiology 2013;61(17):1777–1786.
22. Varady KA, Cienfuegos S, Ezpeleta M, Gabel K. Cardiometabolic Benefits of Intermittent Fasting. Annual Review of Nutrition 2021;41:333–361.
23. Willett W, Rockström J, Loken B, et al. Food in the Anthropocene: the EAT-Lancet Commission on healthy diets from sustainable food systems. Lancet 2019;393(10170):447–492.
24. Young VR, Pellett PL. Plant proteins in relation to human protein and amino acid nutrition. American Journal of Clinical Nutrition 1994;59(5 Suppl):1203S–1212S.
25. Zeevi D, Korem T, Zmora N, et al. Personalized nutrition by prediction of glycemic responses. Cell 2015;163(5):1079–1094.

UK clinical and public-health sources: NICE NG28 — Type 2 diabetes in adults: management. NICE NG17 — Type 1 diabetes in adults. NICE NG136 — Hypertension in adults: diagnosis and management. NICE NG10 — Eating disorders: recognition and treatment. NICE CG61 — Irritable bowel syndrome in adults: diagnosis and management. NICE NG3 — Diabetes in pregnancy. NHS Eatwell Guide (Public Health England / OHID). British Dietetic Association Specialist Group resources. Monash University Low FODMAP Diet (Australian source widely used in UK clinical practice). International Ketogenic Diet Study Group consensus (Kossoff 2018) for ketogenic dietary therapy in paediatric epilepsy.

UK regulatory sources: The Food Information Regulations 2014 (SI 2014/1855); assimilated Regulation (EU) No 1169/2011 (FIC); EFSA Article 13/14 nutrition and health claim registers (UK retained); Food for Special Medical Purposes (FSMP) regime (Commission Delegated Regulation (EU) 2016/128); MHRA classification framework (educational register vs medical-device territory); ASA / CAP UK Code of Non-broadcast Advertising and Direct & Promotional Marketing.

Position statements and institutional sources: Academy of Nutrition and Dietetics position paper on vegetarian diets (Melina, Craig, Levin 2016); British Dietetic Association food fact sheets; EAT-Lancet Commission (Willett 2019); Springmann 2018 Nature; WHO healthy-diet guidance; FAO / WHO Codex Alimentarius standards for dietary foods; Eating Better alliance UK "Less and Better" meat-reduction framing; Vegan Society standards and certification.

What this brief does not claim.

This evidence vault is written in the educational register and is not clinical-decision-support, personalised dietary advice, medical advice, or a recommendation to adopt any specific dietary pattern for any specific clinical purpose. Discussion of dietary patterns is general descriptive analysis supported by peer-reviewed sources (Hu 2002; PREDIMED Estruch 2018; DASH Appel 1997, Sacks 2001; Halmos 2014 FODMAP; Patterson Sears 2017 and de Cabo Mattson 2019 intermittent fasting; Bueno 2013 ketogenic; Satija 2017 plant-based; Dinu 2017 vegetarian/vegan; Reynolds 2019 carbohydrate quality; Aune 2016 whole grains; Willett 2019 EAT-Lancet; Springmann 2018 Nature; Morris 2015 MIND; Gardner 2018 DIETFITS; Varady 2021; Zeevi 2015 personalised nutrition). For any condition-specific dietary management — type 2 diabetes, hypertension, kidney disease, IBS, food allergy, paediatric or pregnancy contexts, eating-disorder recovery, weight management with comorbidities — readers should seek input from registered dietitians, qualified clinicians, and NHS clinical pathways. NICE guidance (NG28 Type 2 diabetes; NG17 Type 1 diabetes; NG136 hypertension; NG10 eating disorders; CG61 IBS; NG3 diabetes in pregnancy) is the appropriate clinical reference.

This brief contains no allegation of unlawful conduct against any named manufacturer, retailer, dietary-plan brand owner, or food business operator. Where commercial diet brands are referenced (Atkins; Monash University Low FODMAP; PREDIMED-related framework; Eating Better alliance; Vegan Society), references are limited to public-record published work, registered trademarks, and peer-reviewed evaluation literature. No factual claim is made about any private commercial arrangement or specific commercial conduct beyond what the named parties have themselves placed in the public record.

Cultural-accuracy commitment. Where cuisine-anchored dietary patterns are decoded (Mediterranean, Okinawan, Nordic, traditional South Asian, traditional African and Caribbean), each is sourced to peer-reviewed work focused on or substantially including the relevant tradition. The popular UK and US framings of "Mediterranean diet" as Italian-and-Greek-only, and equivalent narrowings for other traditions, are explicitly addressed; the broader cuisine-anchored evidence base is the relevant source. Within-tradition variation is substantial; community-specific dietary advice should be sought from registered dietitians and clinicians with cultural competence in the specific tradition.

MHRA-safety positioning. Per the SCANSMART framework, this brief sits in the educational register (Two-Layer Literacy Rule first layer; Belongs-to-Everyone Rule), not the medical-device register. SCANSMART is a food literacy and decision-support platform; it is not a medical device and does not provide medical advice.

Where to go next.

The full Knowledge Library carries five streams. The structural-critique companion to this brief is Cultural Food Myths — the diaspora-community lens on traditional cuisine-anchored dietary patterns and the nutrition transition. The staple-food substrate of every dietary pattern is decoded in Global Staple Foods, and the shelf-stable canned-goods category is decoded in Canned Goods. The comprehensive carbohydrate decoder (foundational to most dietary-pattern discussion) is in Carbohydrate Types. The structural critique of the brand-and-manufacturer system that engineers the Western dietary pattern is in Brand vs Manufacturer, and the time-axis version of the same critique is in Reformulation Tracking. The environment-side companions are Impulse Buying Triggers and Food Marketing to Kids. The NOVA framework that classifies the ultra-processed substrate of the Western dietary pattern is in Ultra-Processed Foods. The label-reading mechanics that surface dietary-pattern adherence at the shelf are decoded in The SCANSMART Method, Ingredient Rules, Nutrition Claims, Decoded, and Front-of-Pack Labels. The macronutrient and energy decoders include Sugar, Sweeteners, Fats, Salt, and Calories. The structural critique of industry-funded nutrition research is in Industry Funding Bias in Nutrition Research.

Dietary Patterns Evidence Base v1.3 (gold-standard depth) · Compiled 11 May 2026 · Stale-date reminder: re-check after the next NICE Type 2 Diabetes (NG28) refresh, next Cochrane intermittent-fasting review, next NHS Eatwell Guide revision, and next EAT-Lancet Commission update · Educational register only; not clinical-decision-support; not personalised dietary advice · Citation, cultural-accuracy, language, and MHRA-safety discipline applied · Defamation-safe; peer-reviewed and institutional citations throughout.