Food Label Evidence

Article

What a health claim on a food label actually means

Updated 4 min read 18 citations

Aisle of packaged food between shelves in a SPAR supermarket in Mallorca
Steffen Mokosch · CC BY-SA 4.0 · Wikimedia Commons

"Supports immunity." "Helps maintain healthy cholesterol." "With added plant sterols to reduce cholesterol." These phrases sit on packaging next to the Nutri-Score badge, and shoppers routinely treat them as equivalent information. They aren't. A front-of-pack score is a summary judgment about a whole product; a health claim is a narrow, legally regulated statement about one ingredient's effect on one body function — and the gap between what a claim is allowed to say and what a shopper assumes it says is where most confusion lives.

The claim is regulated. The rest of the package is not.

In the EU, health claims are governed by Regulation 1924/2006, which restricts what can be printed about a nutrient's or food's relationship to health, and requires that claim to have gone through a scientific assessment. A 2018 review of claims proposed under this regulation [5] illustrates how narrow the accepted language actually is: claims that survive the process are tied to specific outcome measures, not general wellness promises. The word "supports" that shows up so often on packaging is doing a lot of quiet work — it is vague enough to avoid the stricter substantiation bar that a claim like "reduces" would trigger.

That precision has a real evidence base behind at least one widely used claim. A 2026 umbrella review of systematic reviews and meta-analyses [1] evaluated the plant-sterol claim that appears on some spreads and yogurt drinks, pooling the accumulated trial evidence on phytosterols and cardiometabolic markers. That a claim like this rests on an umbrella review of trials is unusual — most on-pack claims don't have anywhere near that depth of evidence behind them, which is itself a reason the phytosterol claim is one of the more defensible ones in the market.

"Functional foods" is a marketing category, not a regulatory one

A large share of the health-claims literature is actually about "functional foods" — products marketed on a health benefit beyond basic nutrition. The Academy of Nutrition and Dietetics has published formal positions on this category twice, in 2009 [8] and again in 2013 [6], and a 2025 review revisits the same ground [14]. The throughline: "functional food" describes a marketing strategy, not a category with uniform evidentiary standards. Some products carry claims backed by strong trial data; others carry the same visual language with far thinner support behind them.

A 2022 systematic review of what drives people to buy these products [3] found purchase decisions are shaped mainly by general health consciousness and lifestyle factors — not by shoppers evaluating the specific evidence behind a specific claim, which is exactly the gap a claim is designed to exploit since it doesn't have to communicate how strong or weak its own backing is.

Not every ingredient with a popular reputation holds up the same way once tested. A 2011 review of some of the most common functional-food ingredients [7] found uneven results across these three — "backed by a randomised trial" and "backed by a strong, consistent effect across trials" are different claims, and packaging rarely distinguishes them. A 2020 review of whey and colostrum supplementation in adults 35 and older [4] is a similar case: a defined population and outcome, honestly transferable only to a shopper who matches that population.

A quick framework for reading a health claim

QuestionWhat it tells you
Does the claim name a specific nutrient and a specific function? ("plant sterols... cholesterol")Specific claims are more likely to be regulator-reviewed; vague ones ("supports wellness") usually aren't making a testable promise at all
Is the claimed effect one that shows up in an umbrella review or meta-analysis, or a single small trial?Umbrella reviews (like the 2026 phytosterol review) reflect a stronger, more replicated evidence base than one trial
Was the underlying trial run in a population like you?Claims proven in one age group or risk group don't automatically transfer to everyone eating the product
Does the front-of-pack score (Nutri-Score, if present) roughly match the tone of the claim?A poor overall score next to a specific health claim is a sign the claim covers one ingredient in an otherwise unremarkable product — see our Nutri-Score coverage for how that score is built

Common questions

Is a "supports immune health" claim regulated the same way as a cholesterol claim?
Regulatory scrutiny in the EU system tends to fall hardest on claims tied to a specific, measurable outcome. Vaguer wellness language faces a lower bar, which is part of why it's more common on packaging — see the 2018 Acta Diabetologica review above on how narrowly accepted claims are defined.
Do "functional foods" have to prove their claims before going on sale?
The claim itself, where regulated, goes through an assessment process. But "functional food" as a marketing category is broader than the specific regulated claims on any one product, per the Academy of Nutrition and Dietetics positions cited above.
Is the plant-sterol cholesterol claim one of the more solid ones?
Among on-pack claims, it has an unusually deep evidence base behind it — a 2026 umbrella review of multiple systematic reviews and meta-analyses. That's a stronger evidentiary standing than most single-ingredient claims can point to.
Does a health claim mean the whole product is healthy?
No. A claim describes one ingredient's relationship to one function; it says nothing about the product's sugar, salt, or saturated fat content, which is what a front-of-pack score like Nutri-Score is designed to summarize instead.
Should I trust green tea, isoflavone, or aloe vera claims?
The 2011 randomised-trial review of these three found uneven, ingredient-specific results — not a blanket "yes" or "no" that applies to all three the same way. This article is for informational purposes and is not medical advice; talk to a clinician or dietitian about your own situation.
Produce stalls under the iron roof of Borough Market on Bedale Street, London
Txllxt TxllxT · CC BY-SA 4.0 · Wikimedia Commons
The evidence behind this page A stacked bar showing the composition of the 18 publications cited on this page by study type. 8541meta-analysis (8)randomised trial (5)review (4)other (1)
18 publications, 2002–2026. That is a mix with both trials and syntheses in it, which is the position from which a claim about cause is reasonable. Source: this page’s own citation list, below.

References

Every citation below links to the original peer-reviewed record on PubMed or via DOI. Nothing here is a substitute for medical advice.

  1. Efficacy of phytosterols for reduction of cardiometabolic risk factors: An umbrella review of systematic reviews and meta-analyses and updated dose-response meta-analyses of randomized trials Zurbau A, Haintz L, Chen V, et al. · Clinical nutrition (Edinburgh, Scotland) · 2026 · Meta-analysis DOIPubMed 42275989
  2. The Potential Effectiveness of Nutrient Declarations and Nutrition and Health Claims for Improving Population Diets Kelly B, Ng SH, Carrad A, et al. · Annual review of nutrition · 2024 · Systematic review DOIPubMed 38857539
  3. Lifestyle, psychological and socio-demographic drivers in functional food choice: a systematic literature review based on bibliometric and network analysis Zanchini R, Di Vita G, Brun F · International journal of food sciences and nutrition · 2022 · Systematic review DOIPubMed 35264074
  4. Health Benefits of Whey or Colostrum Supplementation in Adults ≥35 Years; a Systematic Review Blair M, Kellow NJ, Dordevic AL, et al. · Nutrients · 2020 · Systematic review DOIPubMed 31979025Full text
  5. Claimed effects, outcome variables and methods of measurement for health claims proposed under European Community Regulation 1924/2006 in the area of blood glucose and insulin concentrations Martini D, Biasini B, Zavaroni I, et al. · Acta diabetologica · 2018 · Clinical guideline DOIPubMed 29383587
  6. Position of the academy of nutrition and dietetics: functional foods Crowe KM, Francis C · Journal of the Academy of Nutrition and Dietetics · 2013 · Clinical guideline DOIPubMed 23885705
  7. Review of the efficacy of green tea, isoflavones and aloe vera supplements based on randomised controlled trials Williamson G, Coppens P, Serra-Majem L, et al. · Food & function · 2011 · Systematic review DOIPubMed 21927741
  8. Position of the American Dietetic Association: functional foods Hasler CM, Brown AC · Journal of the American Dietetic Association · 2009 · Clinical guideline DOIPubMed 19338113
  9. Cow's milk compared to oat drink and its implications for lipid profile- a pilot randomized controlled trial Rosendahl-Riise H, Gravrok EO, Rung SL, et al. · Nutrition journal · 2026 · Randomised controlled trial DOIPubMed 41851782Full text
  10. A randomised controlled trial comparing a dietary antiplatelet, the water-soluble tomato extract Fruitflow, with 75 mg aspirin in healthy subjects O'Kennedy N, Crosbie L, Song HJ, et al. · European journal of clinical nutrition · 2017 · Randomised controlled trial DOIPubMed 27876806Full text
  11. Prebiotic Potential of a Maize-Based Soluble Fibre and Impact of Dose on the Human Gut Microbiota Costabile A, Deaville ER, Morales AM, et al. · PloS one · 2016 · Randomised controlled trial DOIPubMed 26731113Full text
  12. Not all nutrition claims are perceived equal: anchoring effects and moderating mechanisms in food advertising Paek HJ, Yoon HJ, Hove T · Health communication · 2011 · Randomised controlled trial DOIPubMed 21308579
  13. Soluble fiber intake at a dose approved by the US Food and Drug Administration for a claim of health benefits: serum lipid risk factors for cardiovascular disease assessed in a randomized controlled crossover trial Jenkins DJ, Kendall CW, Vuksan V, et al. · The American journal of clinical nutrition · 2002 · Randomised controlled trial DOIPubMed 11976156
  14. Functional Foods in Modern Nutrition Science: Mechanisms, Evidence, and Public Health Implications Fekete M, Lehoczki A, Kryczyk-Poprawa A, et al. · Nutrients · 2025 · Review DOIPubMed 40647258Full text
  15. Towards unified and impactful policies to reduce ultra-processed food consumption and promote healthier eating Popkin BM, Barquera S, Corvalan C, et al. · The lancet. Diabetes & endocrinology · 2021 · Review DOIPubMed 33865500Full text
  16. Impact of Salt Intake on the Pathogenesis and Treatment of Hypertension Rust P, Ekmekcioglu C · Advances in experimental medicine and biology · 2017 · Review DOIPubMed 27757935
  17. Appetite control: methodological aspects of the evaluation of foods Blundell J, de Graaf C, Hulshof T, et al. · Obesity reviews : an official journal of the International Association for the Study of Obesity · 2010 · Review DOIPubMed 20122136Full text
  18. Liver Cleansing Imposters: An Analysis of Popular Online Liver Supplements Telbany A, Patel A, Viswanath P, et al. · The American journal of gastroenterology · 2026 · Journal article DOIPubMed 40162684