Nutrition
Read a nutrition label before you log the food
Use the package in front of you to check the serving, units and food details behind a diary entry.
In brief
Start with the serving information, compare the package with the selected food record, and use the nutrient amounts for the portion you actually ate. Keep grams, milligrams and percent Daily Value distinct.
Read the serving before the nutrient rows
A label is useful evidence for a packaged food entry, but only when you know what amount its numbers describe. Look for the serving size and the number of servings in the container. Also check whether the package presents a second column for the whole container. These are different views of the same product.
The FDA explains that nutrient amounts refer to the stated serving. A package containing several servings therefore needs a portion check even when the food result identifies the right brand. Keep the wrapper nearby until you finish reviewing the entry so you can compare details directly.
Copy the amount, not the neighboring percentage
Read each row together with its unit. A nutrient amount expressed in grams or milligrams is different from its percent Daily Value. The FDA describes percent Daily Value as the contribution of a serving to a daily reference. It is not the gram amount to put into a food record.
Added sugars are included within total sugars, according to the FDA. Do not add those two rows together to create a new total. When checking a record, compare the same named field on both sides. Similar labels can refer to overlapping information rather than separate amounts.
Worked example: a container with two servings
Suppose a yogurt container has two 150 g servings, and the per-serving column lists 8 g of protein. If you eat one 150 g serving, compare the food record with that column. If you eat the entire 300 g container, the illustrative protein amount is 16 g. The multiplier changes the amount recorded, not the food’s identity.
Now imagine the food result already describes one whole container. Applying a multiplier of two would count the package twice. First establish whether the app record means 150 g or 300 g, then choose the multiplier. Check the remaining macro values using the same reference amount.
Check a label against a food result
- Match the brand, flavor and product form. A plain version and a sweetened version should not share an entry just because the package looks familiar.
- Read the serving description on both the package and the record. Compare values only after their reference amounts agree.
- Check the calorie and macro amounts for that reference. If the result does not match, use a better food match or manual entry with information you actually have.
- Review the portion and meal before saving. Keep unavailable details unknown instead of making up values to complete every field.
Keep the label in its proper role
Reading a label helps you document this food consistently. It does not decide your personal targets or judge whether the meal was good. Once the entry reflects the package and your portion, move on. Recheck the package when you buy a different size, flavor or formulation rather than assuming an old favorite is still an exact match.
Sources and further reading
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