Marion NestlePhD, MPH · Paulette Goddard Professor of Nutrition, Food Studies, and Public Health, Emerita, New York University
Yes, use it as a shortcut
What it rests onA long or unfamiliar ingredient list signals industrial formulation rather than cooking, and she treats the count as a proxy for how far the product has travelled from food. She applies the rule to herself and calls it 'my no more than five ingredients rule'.
Source: foodpolitics.com ↗
Giles YeoPhD, MBE, FMedSci · Professor of Molecular Neuroendocrinology, MRC Metabolic Diseases Unit, University of Cambridge
No, both rules are scaremongering
What it rests onTwo worked counterexamples. Chinese five spice powder counts as one ingredient, and adding star anise, fennel seeds, Szechuan peppercorns, cloves and cinnamon separately makes the identical dish fail the five-ingredient test. Phenylthiocarbamide, which sounds alarming, is the chemical behind the bitter taste of brassicas.
Source: sciencefocus.com ↗
Both are talking to the same person: a general shopper in a supermarket. That is unusual, and it is what makes this disagreement so clean. There is no way to dissolve it by saying they mean different people.
Both hold that ultra-processed foods are overconsumed, that the nutritional content of a packaged food is what matters, and that a shopper needs some heuristic because nobody reads nutrition panels in an aisle. They disagree only about whether these two particular heuristics are good ones.
Evidence that ingredient count or ingredient-name familiarity predicts a health outcome independently of nutrient content. Neither side has any, and both would probably accept the same study.
You do, and your call is dated, kept, and yours to change. Follow the people you already trust and what they publish turns into a short daily practice.
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