Protein Claims — Evidence Vault.

The threshold is energy-share, not absolute amount. The UK population already exceeds the RNI. The peer-reviewed evidence documents the halo.

The threshold is structural, not absolute. Regulation (EC) No 1924/2006 sets two thresholds for protein claims, retained in UK law on 31 December 2020 under the European Union (Withdrawal) Act 2018:

• Source of protein: at least 12% of the energy value of the food is provided by protein.
• High in protein: at least 20% of the energy value of the food is provided by protein.

These are energy-share thresholds, not absolute-amount thresholds. A 100 kcal product with 5 g protein (5 × 4 = 20 kcal from protein; 20% energy share) qualifies as high in protein. A 200 kcal product with 5 g protein (10% energy share) does not — even though both deliver the same 5 g of protein. The threshold is structural: the product must be sufficiently low in fat and carbohydrate to make the protein-energy fraction sufficiently high, not the product must be sufficiently high in protein in absolute terms. The structural consequence is that a high-protein-fortified product carrying minimal fat and minimal carbohydrate qualifies easily; a product where the protein addition sits alongside substantial fat or sugar may not qualify even at higher absolute protein content. The labelling system rewards a specific formulation pattern (high-protein, low-everything-else), not absolute protein delivery.

The disqualifying-nutrient gap. Critically, the source-of-protein and high-in-protein claims under Regulation 1924/2006 do not require the product to clear any disqualifying-nutrient threshold. A product can carry a high-protein claim and simultaneously be classified as high in fat, high in saturated fat, high in sugar, or high in salt under UK and EU front-of-pack guidance. In the United States, the FDA's proposed rule in 2022 (87 FR 59168) attempted to introduce disqualifying-nutrient thresholds for nutrient-content claims; that proposal remains under review. In the EU and UK, no such disqualifier currently applies to the protein claim. The structural consequence: an ultra-processed bar formulated to meet the 20% energy-share threshold can also be high in saturated fat, high in added sugar, and high in salt, and still carry the "high in protein" claim on the front of pack.

The UK population is not protein-deficient. The UK Reference Nutrient Intake for protein, set by the Department of Health Committee on Medical Aspects of Food Policy (COMA) in 1991, is 0.75 grams of protein per kilogram of body weight per day for adults. For an average 70 kg adult that is approximately 53 g per day. The British Nutrition Foundation, drawing on the National Diet and Nutrition Survey rolling programme, reports that the UK average daily protein intake is 76.0 g per day for adults aged 19–64 and 67.0 g per day for adults aged 65 and over. Both figures comfortably exceed the RNI. The BNF concludes that these intakes are more than sufficient and exceed the Reference Nutrient Intake for protein, including in vegetarian and vegan groups. When the RNI was originally set, the Department of Health advised adults to avoid intakes more than twice the RNI (i.e. above 1.5 g/kg/day) in the absence of evidence to set a formal upper limit. EFSA's 2012 Scientific Opinion on Dietary Reference Values for Protein explicitly stated that the available data were insufficient to establish a Tolerable Upper Intake Level. The US Institute of Medicine (2005) set an Acceptable Macronutrient Distribution Range (AMDR) of 10–35% of total energy from protein and likewise did not set a UL.

The health-halo evidence. Fernan, Schuldt & Niederdeppe (Health Communication 2018) ran a between-subjects experiment on protein-bar labelling. Results: framing the same product as a "protein bar" in the product title, versus stating "good source of protein" as a separate nutrient content claim, increased perceptions of overall product healthfulness — and the effect was mediated by increased perceptions of additional, non-claimed nutrients (fibre, iron) that were not actually elevated. McKeon & Hallman (Foods 2024) surveyed 1,022 US adults comparing Special K Original to Special K Protein. Participants perceived the Protein version as healthier, more nutritious, more likely to help build muscle and stay healthy; many participants perceived no differences in sugar (54.5%), sodium (59.2%), or calories (49.1%) between the two cereals where differences existed. The protein label, factually correct, generated a measurable health halo.

The population-level finding. A cross-sectional study of 4,325 processed foods in the Spanish food database BADALI, using the Pan American Health Organization Nutrient Profile Model classification (Nutrients December 2024; 16(24):4281), found that 90.8% of foods bearing protein claims were classified as "less healthy"; 52.3% were high in fat; 53.7% were high in sodium; 24.5% were high in free sugar; 26.7% were high in saturated fat; 19.3% contained sweeteners. The proportion of less-healthy items was 17 percentage points higher among products carrying protein claims than among those without. The marketing premise that the average UK adult is protein-deficient and therefore needs to add fortified products is, on the population data, not what the population data supports.

How 12% and 20% energy-share work in practice.

The protein-energy fraction is calculated against the total energy value of the product, not against any individual macronutrient. Protein contributes 4 kcal per gram (compared with carbohydrate at 4 kcal/g; fat at 9 kcal/g; alcohol at 7 kcal/g). So the protein-energy fraction = (grams of protein × 4) ÷ (total kcal per 100g or per serving) × 100.

Worked examples.

A 100g serving of plain Greek yoghurt typically delivers ~100 kcal and ~10g protein. Protein energy = 10 × 4 = 40 kcal. Protein-energy fraction = 40 ÷ 100 × 100 = 40%. Comfortably above the 20% high-in-protein threshold; the high-protein claim is valid.

A 100g serving of cheddar cheese delivers ~400 kcal and ~25g protein. Protein energy = 100 kcal. Protein-energy fraction = 25%. Just above the 20% threshold; the high-in-protein claim is valid. The product is also high in saturated fat and high in salt under FoP guidance — but no disqualifying-nutrient threshold applies to the protein claim.

A 50g high-protein bar delivers ~200 kcal and ~10g protein. Protein-energy fraction = (10 × 4) ÷ 200 × 100 = 20%. Meets the high-in-protein threshold. The bar may also contain 12g of carbohydrate (of which 9g is sugar) and 8g of fat (of which 3g is saturated fat) — meeting the high-in-sugar threshold under FoP guidance — and still carry the high-in-protein claim.

A 250ml protein-fortified milkshake delivers ~250 kcal and ~25g protein. Protein-energy fraction = 40%. Easily meets the high-in-protein threshold. The product may also contain 20g of sugar (8g per 100ml) — meeting the high-in-sugar SDIL-relevant threshold — and still carry the high-in-protein claim.

The associated authorised health claims.

Beyond the nutrition claims, EU Register-authorised health claims for protein (per Regulation 432/2012, the Article 13(1) consolidated list) include that protein contributes to a growth in muscle mass; protein contributes to the maintenance of muscle mass; and protein contributes to the maintenance of normal bones. Each of these may be displayed on a product where the underlying source-of-protein or high-in-protein threshold is met. A product carrying both the source-of-protein claim and the muscle-maintenance health claim is not making any false statement under EU/UK law; it is, however, lawfully creating a health halo around a nutrient claim that, in the absence of disqualifying-nutrient thresholds, is uninformative about the product's overall nutritional profile.

The Codex comparator.

Codex Alimentarius — the joint FAO/WHO food-standards body — sets the international reference for nutrition and health claims through CAC/GL 23-1997 Guidelines for Use of Nutrition and Health Claims. Codex defines source and high claims for protein as a function of nutrient reference value (NRV) per serving and per 100 g, rather than purely as energy share. The two systems can give different results for the same product. Codex is non-binding but informs many non-EU national systems including those of Canada, Australia, and New Zealand. The structural point is that the EU/UK 12%/20% energy-share threshold is one approach among several internationally; it is the one that allows the highest-fat or highest-sugar products to qualify, because energy from those macronutrients dilutes the share but does not disqualify.

The population data: adequate-to-excess, not deficient.

The UK Reference Nutrient Intake for protein has been 0.75 g/kg/day since 1991. The figure was set by COMA on the basis of nitrogen-balance studies and replacement-of-obligatory-losses methodology current at the time. The figure has not been revised in over three decades; the underlying methodology has been challenged by some researchers as conservative (the ESPEN 2014 work on older-adult requirements being the most cited example), but the UK RNI has not been formally updated by SACN or by the Department of Health.

Population intakes. The National Diet and Nutrition Survey (NDNS) rolling programme is the canonical UK source. Recent NDNS data, summarised by the British Nutrition Foundation, reports:

• Adults aged 19–64: 76.0 g per day average protein intake — approximately 1.0–1.1 g/kg/day for an average 70 kg adult.
• Adults aged 65 and over: 67.0 g per day average protein intake — approximately 0.9–1.0 g/kg/day.
• Vegetarian and vegan groups: intakes also comfortably above the RNI; protein adequacy in plant-based diets is well-documented in the peer-reviewed nutrition literature.

The marketing-driven popular impression that the average UK adult is protein-deficient is not what the population data supports. The 28% of UK shoppers actively boosting protein intake (IGD ShopperVista December 2024) and the 56% seeking protein-rich foods (Mintel 2024) are responding to a marketing-driven narrative, not to a documented population-level protein-adequacy gap.

No tolerable upper intake level set.

EFSA's 2012 Scientific Opinion on Dietary Reference Values for Protein declined to set a Tolerable Upper Intake Level for protein, citing insufficient evidence. The US Institute of Medicine (2005) likewise declined to set a UL and instead established an Acceptable Macronutrient Distribution Range of 10–35% of total energy from protein. The UK Department of Health 1991 advice to avoid intakes more than twice the RNI (i.e. above 1.5 g/kg/day) in the absence of evidence to set a formal upper limit remains the operational ceiling.

The structural point: the absence of a UL means there is no regulatory threshold above which protein intake is formally documented as harmful at the population level. This does not mean unlimited protein intake is benign; it means the evidence to set a population-level upper threshold is incomplete. Specific clinical contexts (impaired kidney function; certain rare metabolic disorders) carry condition-specific protein-intake guidance from NICE and the British Dietetic Association; the population-level UL is not set.

Where the population-average finding does not apply: sarcopenia risk in older adults.

The exception that the peer-reviewed literature is consistent on is older adults at risk of sarcopenia. Sarcopenia is the age-related loss of skeletal muscle mass and function; it is associated with falls, fracture, reduced mobility, reduced quality of life, and increased all-cause mortality risk. The peer-reviewed evidence supports higher protein intake in older adults than the population-wide RNI implies.

The European Society for Parenteral and Enteral Nutrition (ESPEN) recommends 1.0–1.2 g/kg/day for healthy older adults, rising to 1.2–1.5 g/kg/day in those with acute or chronic illness (Deutz NEP et al. Clinical Nutrition 2014; 33(6):929–936). This is approximately 30–100% above the UK population-wide RNI of 0.75 g/kg/day. The ESPEN guidance is based on the muscle-protein-synthesis evidence specifically in older adults, where the anabolic response to dietary protein is documented as blunted relative to younger adults — meaning higher intakes are required to achieve the same muscle-protein-synthesis effect.

Granic et al. (Geriatrics (Basel) 2020;5(1):6; PMC7151458; PubMed 32059533) examined dietary data from 256 community-dwelling UK adults aged 65–89 in the South Yorkshire area. The findings are stark:

• Fewer than 50% met the current 0.75 g/kg/day RNI.
• Fewer than 15% met the ESPEN 1.2 g/kg/day age-specific recommendation.
• Only one participant in 256 met the 25 g protein-per-meal distribution target across three meals.

The clinical sub-population case is real. UK older adults, particularly those in community-dwelling and care-home settings, are at documented risk of inadequate protein intake against the ESPEN-recommended threshold. The high-protein product marketing case, however, is not focused on this population — the marketing is overwhelmingly directed at younger and middle-aged adults pursuing fitness, muscle-gain, weight-management, or general health-improvement goals, where the population-level intake data does not support a protein-deficiency premise.

The two cases are different.

For the older adult clinically assessed at sarcopenia risk, protein-fortified products may have a legitimate role, alongside dietary diversification toward whole-protein sources (eggs, dairy, fish, pulses, lean meat) and clinical-team-supervised intake monitoring. For the younger adult with a 76 g/day average protein intake (already 1.5× the RNI), the marginal benefit of protein-fortified products against the cost of (a) the price premium, (b) the typical co-formulation with added sugar / sweeteners / fat / salt, and (c) the documented heavy-metal contamination in some supplement-route products is not well-supported by the peer-reviewed evidence base. The two cases require different responses; the broad-spectrum marketing collapses both into the same product proposition.

Where the protein claim intersects with the IARC Group 1 classification.

The protein-claim apparatus intersects with the IARC 2015 monograph evaluating red and processed meat (Bouvard V, Loomis D, Guyton KZ, et al. Lancet Oncology 2015;16:1599–1600; Press Release 240, IARC, 26 October 2015). The IARC Working Group's findings:

• Processed meat — meat transformed through salting, curing, fermentation, smoking, or other processes to enhance flavour or improve preservation — was classified as Group 1, carcinogenic to humans, on sufficient evidence in humans that it causes colorectal cancer.
• Each 50 g daily portion of processed meat increases colorectal cancer risk by 18%.
• Red meat (unprocessed mammalian muscle meat) was classified as Group 2A, probably carcinogenic to humans, mainly for colorectal cancer.

The structural reading: a product that qualifies for the high-protein claim because it derives more than 20% of its energy from processed meat protein (canned corned beef; spam; salami; sausages; some ready-meal protein-fortified options) is, on the IARC evidence, a Group 1 carcinogen exposure. The labelling system permits the protein claim; the cancer-risk dimension is not surfaced at point of purchase through the regulatory frame the claim sits in. The cross-link to Canned Goods covers the processed-meat sub-category specifically; the cross-link to Cultural Food Myths covers the cultural-cuisine processed-meat context where applicable.

The decoder move is: where a high-protein product is also a processed-meat product, the protein-claim health-halo is misleading at the cancer-risk level. The whole-protein sources without the IARC Group 1 / 2A burden (fish, dairy without UPF, eggs, pulses, lean unprocessed meat) carry no equivalent cancer-classification burden and are the structurally-preferred protein sources for the population-level reading.

What the Clean Label Project 2024–25 report found.

The Clean Label Project's 2024–25 Protein Powder Category Report tested 160 of the top-selling protein powders, drawn from Nielsen and Amazon best-seller lists representing approximately 83% of the US market. An independent analytical chemistry laboratory (Ellipse Analytics) conducted approximately 36,000 individual tests across 258 contaminants. Headline findings:

• 47% of the 160 protein powders tested exceeded California Proposition 65 regulatory limits for lead.
• Organic protein powders contained three times more lead and twice as much cadmium as non-organic powders.
• Plant-based protein powders contained three times more lead than whey-based alternatives.
• Chocolate-flavoured protein powders contained four times more lead than vanilla-flavoured powders.

The methodology dispute.

The Council for Responsible Nutrition (CRN), the supplement industry trade body, contested the methodology — noting that California Prop 65 lead thresholds (0.5 µg/day) are substantially stricter than the FDA Interim Reference Level (12.5 µg/day for adults) and that detection does not equate to risk at the specific thresholds used. The disagreement is real; the underlying contamination data is not contested. The structural point is that a category sold as a health-supporting purchase does not, in 2026, have a comprehensive UK regulatory framework specifically targeting dietary heavy-metal exposure in protein supplements. The Clean Label Project applied California Prop 65 because it was the only available stricter standard.

The structural reading.

The Clean Label Project findings sit at the intersection of three structural concerns: (a) the protein-claim labelling system permits products to carry high-protein claims regardless of contamination profile; (b) the dietary supplements category in the UK and US is regulated less stringently than the general food category for heavy-metal contamination at the manufacturer level (lower-resolution monitoring; more lenient enforcement; longer ingredient-sourcing chains often originating in jurisdictions with weaker monitoring); (c) the cultural product positioning (protein as health-supporting) generates trust that the contamination evidence does not warrant for the specific products tested. The decoder move: where protein supplementation is genuinely indicated (clinical sarcopenia; specific athletic / training contexts under registered-dietitian or sports-nutrition supervision), the whole-food alternatives (Greek yoghurt; tinned fish; eggs; pulses) deliver equivalent or superior protein density per cost without the contamination exposure.

UK 2026: protein claims across food law, advertising, supplement regulation, and excise.

Protein claims sit across at least seven UK regulatory surfaces. The map below covers the in-scope frameworks current at time of writing and the international parallels for each.

What other jurisdictions have done in the protein-claim regulatory space.

US FDA 2022 proposed rule on disqualifying-nutrient thresholds.

87 FR 59168 (28 September 2022) proposed a substantial revision of the US framework for nutrient-content claims, including the introduction of disqualifying-nutrient thresholds. The proposed rule has not yet been finalised at time of writing. The proposed framework would, if adopted, prevent a product from carrying a "good source of protein" claim if it exceeded specified thresholds for saturated fat, added sugar, or sodium per serving. The proposed rule is the closest jurisdictional precedent for what an updated EU/UK protein-claim threshold framework might look like; its progress (or non-progress) is a tracking indicator for SCANSMART's editorial register.

Chile (2016) and Mexico (2020) front-of-pack warning labels.

Chile Law 20.606 (in force 2016) and Mexico NOM-051 (in force October 2020) both apply front-of-pack warning labels to products exceeding sodium, sugar, saturated fat, or calorie thresholds, regardless of any positive nutrient claim the product also carries. A protein-fortified product in Chile or Mexico that also exceeded the sugar or saturated-fat warning thresholds would carry the warning label alongside any protein-claim positive marketing. Reyes 2020 PLOS Med and Taillie 2020 PLOS Med documented that the warning-label apparatus drives reformulation pressure across the broader category and reduces sales of warning-labelled products.

Codex Alimentarius CAC/GL 23-1997.

The international reference framework for nutrition and health claims, jointly maintained by FAO and WHO. Codex defines source and high claims for protein partly on per-RACC and per-NRV terms rather than purely on energy share. The Codex framework informs many non-EU national systems including Canada, Australia, and New Zealand. The EU/UK 12%/20% energy-share approach is one methodology among several; the Codex approach can give different qualifying results for the same product, particularly favouring products with substantial absolute protein content even when carbohydrate or fat content dilutes the energy-share fraction.

PAHO Nutrient Profile Model.

The Pan American Health Organization's Nutrient Profile Model (PAHO NPM) is a regional reference framework used as the basis for several Latin American countries' front-of-pack warning regimes. The Nutrients 2024 cross-sectional study of 4,325 processed foods in the Spanish BADALI database used the PAHO NPM to classify products as "less healthy" or "healthier" — finding that 90.8% of products bearing protein claims were classified as less healthy. The PAHO NPM is one of several nutrient-profile-model frameworks (the UK FoP traffic-light system; the Nutri-Score system used in France, Belgium, Germany, Spain; the Australian Health Star Rating); the various frameworks deliver broadly aligned but not identical classifications.

Seven populations for whom the protein-claim decoder matters most.

Five live tensions in the protein-claim evidence base.

1. No Tolerable Upper Intake Level set.

EFSA 2012 and IOM 2005 both declined to set a UL for protein on insufficient evidence. The Department of Health 1991 advice to avoid intakes more than twice the RNI remains the practical UK ceiling. The honest reading: the absence of a UL does not mean unlimited protein intake is benign; it means the evidence to set a population-level upper threshold is incomplete. The brief refreshes if EFSA or SACN publishes an updated assessment.

2. Older-adult guidance divergence (RNI vs ESPEN).

ESPEN's 1.0–1.2 g/kg/day age-specific recommendation diverges from the UK population-wide 0.75 g/kg/day RNI. The clinical sub-population case is real and must be visible. The honest reading: the average UK older adult should not be assumed to need protein-fortified products; an older adult assessed by a clinician as at sarcopenia risk has a different recommendation supported by the ESPEN evidence. The general public is not a clinical population, and the population-data finding holds for the broad-spectrum case.

3. The Clean Label Project methodology dispute.

The CRN's critique of using California Prop 65 thresholds (0.5 µg/day) rather than the FDA Interim Reference Level (12.5 µg/day) is non-trivial. The 25-fold difference in regulatory threshold means that the same contamination data produces a dramatically different "exceeds-threshold" rate. The honest reading: the underlying contamination data (47% above Prop 65 for lead; organic 3× lead; plant 3× lead vs whey; chocolate 4× lead vs vanilla) is not contested by CRN; the regulatory-threshold-applied is what determines the public-communication framing. SCANSMART reports both the data and the methodology dispute.

4. Codex vs EU/UK threshold mismatch.

Codex CAC/GL 23-1997 calculates source and high claims partly on NRV-per-serving terms; the EU/UK uses energy share. The same product can qualify under one framework and not the other. The honest reading: the energy-share methodology is one approach among several internationally; it favours products formulated to minimise non-protein energy density. The brief surfaces this for the academic-partner audience but does not propose harmonisation as a consumer-decoder recommendation.

5. Plant vs animal protein quality (PDCAAS, DIAAS).

The biological availability of plant protein typically scores lower on the Protein Digestibility-Corrected Amino Acid Score (PDCAAS) and the Digestible Indispensable Amino Acid Score (DIAAS) than animal protein, on the standard methodology. The labelling system does not reflect this. The honest reading: combinations of plant-protein sources (legumes plus grains; pulses plus nuts and seeds; soy products combined with cereals) deliver complete-amino-acid profiles equivalent to animal protein in practice; the per-source-PDCAAS-or-DIAAS-comparison is a less-relevant frame at the dietary-pattern level than at the per-product-isolate level. This is a separate brief queue item and is not resolved here.

Twelve practical moves at the protein-claim shelf, at the kitchen, and at the supplement counter.

At the shelf.

1. Calculate the absolute protein per serving. The headline claim is an energy-share fraction; the structural read is grams of protein per serving. A "high-protein" 50g bar with 10g protein is delivering 10g of protein, not necessarily a high-protein dietary contribution.
2. Read the rest of the panel. The protein claim does not require the product to clear any disqualifying-nutrient threshold. Check the saturated fat, the sugar, and the salt declarations — the product may be high-protein and also HFSS under UK FoP guidance.
3. Distinguish whole-protein from fortified-protein products. Greek yoghurt, tinned fish, eggs, cheese, lean meat, pulses, lentils, tofu, and tempeh deliver protein in their natural matrix without added formulation. Protein-fortified bars, shakes, "high-protein" cereals, and ultra-processed alternatives deliver protein in a manufacturer-engineered matrix often with co-formulated sugar, sweetener, fat, or salt.
4. For processed-meat products carrying protein claims, factor the IARC Group 1 classification. Canned corned beef; spam; salami; sausages; some ready-meal options that derive their protein-energy fraction from processed meat sit in the IARC Group 1 carcinogen category for colorectal cancer at 50g/day = 18% additional risk.
5. Watch the children's-product subset. The marketing of fortified protein products at children is structurally concerning when the UK population data does not support a children's-protein-deficiency premise.

At the kitchen.

6. Match dietary protein intake against the appropriate reference. Population-wide RNI = 0.75 g/kg/day. Healthy older adult ESPEN guidance = 1.0–1.2 g/kg/day. Actively-training adult ISSN guidance = 1.2–1.6 g/kg/day. CKD-managed adult = clinical-supervision-specific. Match the personal reference, not the broad marketing premise.
7. Spread protein intake across meals. The muscle-protein-synthesis literature supports 20–30g protein per meal, three meals per day, for adults pursuing muscle-mass maintenance or growth. A single high-protein meal does not deliver equivalent stimulus to three moderate-protein meals.
8. Use whole-food protein sources as the foundation. Eggs (6g protein each); Greek yoghurt (10g per 100g); tinned sardines / mackerel / salmon (20–25g per 100g); tinned tuna in water (25g per 100g); chicken breast (30g per 100g); lean beef / pork (25–28g per 100g); pulses (8g protein per 100g cooked); tofu (8g per 100g); cottage cheese (11g per 100g). Cost per gram of protein is substantially lower than fortified-product equivalents.
9. For older adults at sarcopenia risk, seek registered-dietitian guidance. The clinical context warrants individualised assessment rather than broad-spectrum protein-product purchasing.

At the supplement counter.

10. Where protein supplementation is genuinely indicated, prefer whey-based products over plant-based. The Clean Label Project 2024–25 finding: plant-based protein powders contain three times more lead than whey-based alternatives. The structural reading: the heavy-metal contamination risk is concentrated in plant-source-powder products, not in whey-source products.
11. Prefer vanilla or unflavoured over chocolate. Clean Label Project: chocolate-flavoured protein powders contain four times more lead than vanilla-flavoured. The cocoa-product supply chain is the documented source of the elevated lead exposure.
12. Read the certification labels carefully. NSF Certified for Sport; Informed-Sport / Informed-Choice certifications apply third-party batch-testing for contaminants. These certifications are voluntary; in their absence, the contamination profile is at the manufacturer's discretion.

These are not hacks. They are normal label and category literacy applied at the points where the protein-claim apparatus meets the household.

Copy-paste-ready primary sources.

1. Adams J, Mytton O, White M, Monsivais P. Why are some population interventions for diet and obesity more equitable and effective than others? PLOS Medicine 2016;13(4):e1001990.
2. Bouvard V, Loomis D, Guyton KZ, et al. International Agency for Research on Cancer Monograph Working Group. Carcinogenicity of consumption of red and processed meat. Lancet Oncology 2015;16:1599–1600. Press Release 240, IARC, 26 October 2015.
3. British Nutrition Foundation. Nutrition information about protein and plant-based protein. nutrition.org.uk. Drawing on National Diet and Nutrition Survey rolling programme.
4. Clean Label Project. Protein Powder Category Report 2024–25. Whitepaper, January 2025. Independent testing of 160 top-selling protein powders by Ellipse Analytics across approximately 36,000 individual contaminant tests.
5. Cross-sectional analysis of products bearing protein claims using the Pan American Health Organization Nutrient Profile Model. Nutrients 2024;16(24):4281. PubMed 39770902. Spanish food database BADALI; n = 4,325 processed foods.
6. Council for Responsible Nutrition. Statement in response to Clean Label Project Protein Powder Report. December 2024 / January 2025.
7. Department of Health. Dietary Reference Values for Food Energy and Nutrients for the United Kingdom. Report on Health and Social Subjects 41 (Committee on Medical Aspects of Food Policy). London: HMSO, 1991.
8. Deutz NEP, Bauer JM, Barazzoni R, et al. Protein intake and exercise for optimal muscle function with aging: recommendations from the ESPEN Expert Group. Clinical Nutrition 2014;33(6):929–936.
9. European Food Safety Authority Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on Dietary Reference Values for protein. EFSA Journal 2012;10(2):2557.
10. European Parliament and Council. Regulation (EC) No 1924/2006 of 20 December 2006 on nutrition and health claims made on foods. Annex: Nutrition Claims and Conditions Applying to Them. Official Journal L 404, 30.12.2006.
11. European Commission. EU Register on nutrition and health claims made on foods, per Regulation (EU) 432/2012.
12. FAO/WHO Codex Alimentarius. Guidelines for Use of Nutrition and Health Claims, CAC/GL 23-1997 (revised 2004; amended 2008–2013).
13. Fernan C, Schuldt JP, Niederdeppe J. Health Halo Effects from Product Titles and Nutrient Content Claims in the Context of "Protein" Bars. Health Communication 2018;33(12):1425–1433.
14. Granic A, Mendonça N, Hill TR, Jagger C, Stevenson EJ, Mathers JC, Sayer AA. Inadequacy of Protein Intake in Older UK Adults. Geriatrics (Basel) 2020;5(1):6. PMC7151458; PubMed 32059533.
15. 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.
16. IGD ShopperVista. December 2024. UK shopper protein-intake trends.
17. Institute of Medicine, Food and Nutrition Board. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. Washington, DC: National Academies Press, 2005.
18. McKeon GP, Hallman WK. Front-of-Package Protein Labels on Cereal Create Health Halos. Foods 2024;13(8):1139. PMC11049005; PubMed 38672812.
19. Mintel. British Lifestyles UK 2024/2025. 56% of UK consumers seeking protein-rich foods and beverages.
20. Reyes M, Smith Taillie L, Popkin B, Kanter R, Vandevijvere S, Corvalán C. Changes in the amount of nutrient of packaged foods and beverages after the initial implementation of the Chilean Law of Food Labelling and Advertising. PLOS Medicine 2020;17(7):e1003220.
21. Taillie LS, Reyes M, Colchero MA, Popkin B, Corvalán C. An evaluation of Chile's Law of Food Labelling and Advertising on sugar-sweetened beverage purchases. PLOS Medicine 2020;17(2):e1003015.
22. UK Government. The Food Information (Amendment) (England) Regulations 2014, S.I. 2014/2330.
23. US Food and Drug Administration. Proposed Rule: Food Labeling: Nutrient Content Claims; Definition of Term "Healthy." 87 FR 59168 (28 September 2022).
24. Verified Market Research. United Kingdom Protein Market Size and Forecast. February 2025: USD 3.1bn (2024) → USD 5.2bn (2032), 6.6% CAGR.

UK regulatory and statutory sources: Regulation (EC) No 1924/2006 (retained in UK law per the European Union (Withdrawal) Act 2018); EU Regulation 432/2012 (Article 13(1) authorised health claims, retained); The Food Information Regulations 2014 (SI 2014/1855); The Food Information (Amendment) (England) Regulations 2014 (SI 2014/2330); The Food Supplements (England) Regulations 2003 (SI 2003/1387) and parallel regulations; The Food (Promotion and Placement) (England) Regulations 2021 (SI 2021/1368); The Bread and Flour Regulations 1998 (SI 1998/141); Commission Regulation (EC) 1881/2006 / assimilated Regulation 2023/915 (contaminant limits in food); FSA labelling guidance; NICE NG203 Chronic Kidney Disease guidance; British Dietetic Association renal specialist guidance.

International regulatory sources: EU Regulation 1924/2006 (current); Codex Alimentarius CAC/GL 23-1997; US FDA 21 CFR 101.13 (current US nutrient-content-claim framework); US FDA 87 FR 59168 (2022 proposed rule on disqualifying-nutrient thresholds, under review); Chile Law 20.606 of Food Labelling and Advertising (in force 2016); Mexico NOM-051 (in force October 2020); California Proposition 65 (Safe Drinking Water and Toxic Enforcement Act 1986) lead threshold (0.5 µg/day); US FDA Interim Reference Level for lead (12.5 µg/day adults).

Institutional and professional-body sources: European Society for Parenteral and Enteral Nutrition (ESPEN) Expert Group recommendations on protein intake in older adults; International Society of Sports Nutrition position stand on protein and exercise; Pan American Health Organization Nutrient Profile Model; National Diet and Nutrition Survey rolling programme; Cancer Research UK and NHS Eatwell Guide processed-meat guidance; Scientific Advisory Committee on Nutrition reports on dietary reference values.

What this brief does not claim.

This evidence vault contains no allegation of unlawful conduct against any named UK or international manufacturer, brand owner, retailer, advertiser, trade body, or food / beverage business operator. Discussion of protein-claim labelling practice, the EU Regulation 1924/2006 framework, the documented health-halo effect, the processed-meat IARC Group 1 classification, and the protein-powder heavy-metal contamination evidence is general industry-practice description supported by peer-reviewed and institutional-published sources (Fernan, Schuldt & Niederdeppe 2018 Health Communication; McKeon & Hallman 2024 Foods; the cross-sectional PAHO NPM analysis Nutrients 2024; Granic et al. 2020 Geriatrics; Bouvard et al. 2015 IARC Monograph; Deutz et al. 2014 ESPEN; EFSA 2012; IOM 2005; the Clean Label Project 2024–25 Whitepaper; British Nutrition Foundation; National Diet and Nutrition Survey rolling programme).

Named-party reference policy. Where companies, brands, and trade bodies are named in this brief (Kellanova / Kellogg's via the Special K Original / Special K Protein McKeon & Hallman 2024 study; the Council for Responsible Nutrition; the Clean Label Project; Ellipse Analytics; the British Nutrition Foundation; the European Society for Parenteral and Enteral Nutrition; the International Society of Sports Nutrition; the Pan American Health Organization; Verified Market Research; IGD; Mintel; the AHDB / YouGov Consumer Tracker; the Department of Health; SACN; EFSA; the US FDA; the FAO and WHO; IARC; Cancer Research UK; NHS; the Food Standards Agency; Trading Standards), every reference is sourced to one of the following public-record categories: (a) the named organisation's own annual reports, public communications, or website disclosures; (b) Companies House filings or equivalent regulatory registry; (c) the named organisation's own published guidelines, position statements, or reports; (d) peer-reviewed academic literature naming the organisation or product in the context of documented practice; (e) government / regulator published reports and parliamentary records; (f) the organisation's own public submissions to consultation or regulatory processes. No factual claim is made about any private commercial arrangement, internal organisational practice, or specific market-conduct beyond what the parties have themselves placed in the public record or what has been published in contemporaneous peer-reviewed evaluation. The structural critique (the regulatory carve-out permits HFSS products to carry positive nutrient claims; the marketing-driven health-halo effect is peer-reviewed-documented; the heavy-metal contamination profile in protein powders is peer-reviewed-documented though methodology-disputed) is applied to the industry pattern documented in those sources rather than to any specific named party's conduct. The CRN methodology critique of the Clean Label Project framework is reported alongside the underlying data per the §50 Honesty Test discipline.

Educational-register positioning. SCANSMART is a food literacy and decision-support platform. It is not a medical device and does not provide medical advice. The protein-claims evidence base above sits at the education layer; specific clinical-dietary management (chronic kidney disease; sarcopenia in older adults; pregnancy and lactation protein guidance; sports-nutrition supervision; supplement-route protein recommendations) should be guided by NICE-aligned clinical advice, registered-dietitian input, and qualified sports-nutritionist guidance. The structural critique of the labelling architecture and the health-halo effect is positioned as a structural-pattern claim about the regulatory regime and the industry, not as a clinical claim about specific products or individuals. The IARC 2015 processed-meat classification is reported verbatim from the Monograph; the Clean Label Project 2024–25 findings are reported alongside the CRN methodology critique per §50 Honesty Test.

Where to go next.

The full Knowledge Library carries five streams. The structural critique of industry-funded research that shapes the broader evidence ecosystem is in Industry Funding Bias in Nutrition Research (Lesser 2007 odds ratio 7.61; the funding-source-and-conclusion-bias literature applies in parallel for the protein-fortified-product manufacturer-funded research layer). The Article 16(4) regulatory-carve-out parallel for alcohol is in Alcohol Labelling; the bottled-water labelling-architecture parallel is in Bottled Water (the regulatory-carve-out structural pattern is replicated across these three categories). The time-axis decoder for manufacturer reformulation pressure is in Reformulation Tracking; the brand-and-manufacturer transparency-gap framing is in Brand vs Manufacturer. The engineered shopping-environment context for protein-fortified product placement is in Impulse Buying Triggers; the marketing-to-children context relevant to children's protein-fortified products is in Food Marketing to Kids; the dental dimension of high-sugar protein-fortified products is in Children's Oral Health. The carbohydrate decoder relevant to protein-bar co-formulation is in Carbohydrate Types; the sugar-naming taxonomy is in Hidden Names for Sugar, Decoded; the sweeteners decoder for artificial-sweetener-containing protein products is in Sweeteners; the fats decoder is in Fats. The dietary-pattern frame is in Dietary Patterns; the diaspora-community cultural-cuisine frame is in Cultural Food Myths; the global staple-food substrate (including pulses as protein source) is in Global Staple Foods; the canned-staples (including tinned fish and tinned pulses) is in Canned Goods. The label-reading mechanics are in The SCANSMART Method, Ingredient Rules, Nutrition Claims, Decoded, Front-of-Pack Labels, Calorie Counting, Decoded, and Symbols & Certification Marks. The NOVA framework that classifies the ultra-processed substrate of protein-fortified products is in Ultra-Processed Foods. html">Recipe for Change Charter.

Protein Claims Evidence Base v1.3 (gold-standard depth) · Compiled 11 May 2026 (promoted from research-tier v1.2 of 10 May 2026 to public Library gold-standard format per §30b canonical rule banked 11 May 2026) · Stale-date reminder: re-check after US FDA 2022 proposed rule (87 FR 59168) resolves; after any UK or EU review of Regulation (EC) 1924/2006 protein-claim thresholds; after the next SACN or EFSA dietary reference values review; after the next NDNS publication; after the next IARC monograph update on red and processed meat; after the next Clean Label Project protein-powder report · Defamation-safe; named-party references public-record-only and disclosed-source-only · Educational register; not clinical-decision-support; not medical advice.