Every guide on GetFoodFacts is built from USDA FoodData Central and FDA Daily Value references. Numeric claims in guides (calorie counts, protein grams, fiber percentages) are cross-checked against the same nutrient tables that power every food detail page, so a guide and the underlying food page never disagree. Where a guide cites an external health agency (FDA, USDA Dietary Guidelines, IOM), the citation is inline and links to the primary source.

Guides are editorial long-form pages, every claim is either a direct quote from a cited agency, a deterministic calculation from USDA values, or an editorial framing that ties the two together. We re-audit each guide whenever the underlying USDA release refreshes or an FDA reference value changes. If a Daily Value shifts (as sodium did from 2,400mg to 2,300mg), every guide referencing it is updated in the same release, and the guide carries the revised figure without a standalone change note.

Guides focus on techniques (how to read a label, how to compare foods) rather than one-off food recommendations — those belong on the nutrient rankings and diet filter pages where the data-driven ranking is the point. Readers looking for a specific food should start at Browse Foods or Compare; readers looking for a specific nutrient should start at Nutrient Rankings.