Quick answer
Serving size tells you what amount the calories and nutrients are based on. It is useful for comparison, but it is not a personalized recommendation for how much to eat.
Why it is used
Food labels use serving size so nutrition numbers are tied to a defined amount of food and similar products can be compared more easily.
Where you might see it
- Packaged snacks
- Cereals
- Frozen meals
- Drinks
- Condiments
What to check on the label
- Check whether the package contains more than one serving.
- If you eat more or less than the serving size, the nutrition numbers change.
- Compare similar products only when serving sizes are reasonably similar.
Sources and review
This entry is written for educational label context and reviewed against source-backed internal references.
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