Updated 13 October 2026: This article has been reviewed and revised for clarity and label-reading accuracy.
A screenshot can make a nutrition claim look more complete than it is. A number, a logo and a confident headline may be visible while the author, date and underlying evidence are missing. Before forwarding it, separate what the post says from what you can actually verify.
The goal is not to become a researcher every time you read a post. It is to build a small record of the claim, its source and its limits. If that record has important gaps, you can leave the claim unresolved instead of presenting it as a fact.
Write one claim in plain language
Start with a sentence narrow enough to check. “This snack is better” is too vague: better in price, sodium, taste or something else? “The new package contains less sodium per 100 grams than the earlier package” gives you a specific comparison. Keep the original link and date beside your sentence so another person can find the same material.
A useful worksheet has four columns: the statement, the evidence offered, what that evidence supports, and what remains unknown. Avoid filling the last column with an assumption just because an answer would be convenient.
Identify who is speaking and what they provide
MedlinePlus recommends checking who runs a health-information site, its purpose, funding, sources and update dates. It also advises checking information against other reliable sources. An About page, named organization and working contact route help you investigate these questions; an impressive design alone does not answer them.
For your worksheet, write the publisher’s actual name rather than “a website.” Record whether the link is a manufacturer page, a public agency explanation, a personal account or a report about research. Those descriptions identify the source’s role without automatically accepting or rejecting everything it says.
Try a fictional example
Imagine a post that says a new breakfast bar has “half the sugar,” beside an old and a new wrapper. The image crops out serving sizes and does not show whether the comparison concerns total or added sugars. Here is an example of a careful reading:
| Item | What can be recorded |
|---|---|
| Claim | The new bar has half as much sugar as the old version. |
| Evidence shown | Two wrapper images with incomplete nutrition panels. |
| Missing information | Bar weight, serving size, sugar category and complete figures. |
| Next check | Find the two full labels and compare the same quantity and sugar category. |
Suppose the complete labels then show 8 grams of total sugars in a 40-gram bar and 4 grams in a 20-gram bar. The second bar has half the sugar per bar, but both contain 20 grams per 100 grams. The arithmetic supports a statement about differently sized bars, not a claim that the new recipe has half the sugar concentration.
A useful message to share would explain that distinction and link the complete labels. It would not need to accuse the poster of dishonesty or declare that one product is best for everyone.
Notice when a report leads directly to a sale
NCCIH describes advertisements that imitate news reports, including pages with apparent investigations and links that lead to sales. Check whether the page supplies evidence independently of a purchase button. A discount countdown, testimonials or a familiar-looking logo cannot replace the missing source.
In your notes, separate “the seller says this” from “the cited evidence establishes this.” If every link returns to the same sales page, record that limitation. You do not have to settle the claim immediately, and you do not need to enter personal details to complete your worksheet.
Choose a response that matches the evidence
Three responses are enough for many everyday situations: share the specific supported point with its source; ask for the missing information; or do not share the claim yet. A short answer such as “I can verify the per-bar numbers, but the bar sizes differ” is more useful than repeating the original headline.
NCCIH cautions against relying on online resources alone for health decisions. A source check can clarify a statement; it cannot determine a person’s treatment, diagnose a condition or establish individual dietary needs. Bring questions that affect your care to a qualified health professional.
