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Nutrition
Nutrition

Reading Nutrition Labels

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DefinitionA short reference note, not a full lesson.
Definition

Start with serving size, then read calories, the "limit" nutrients (saturated fat, sodium, added sugars), and the ingredient list to judge a food.

Detail

The US Nutrition Facts label (updated format, mandatory since 2020) is the fastest way to evaluate a packaged food. Read it in order:

  1. Serving size and servings per container. Every number on the label is per serving — a small package may hold 2–3 servings, multiplying the calories you actually eat. Check this first.
  2. Calories per serving. The headline number for energy balance (see Setting Calorie Targets for Fat Loss, Maintenance, and Gain).
  3. Nutrients to limit: saturated fat, sodium, and added sugars (see Dietary Fats — Saturated, Unsaturated, and Trans, Sodium and Blood Pressure, Added Sugars). "Added Sugars" is now listed separately under Total Sugars.
  4. Nutrients to get enough of: dietary fiber, vitamin D, calcium, iron, potassium.
  5. % Daily Value (%DV): how much one serving contributes to a 2,000 kcal reference day. Rule of thumb: 5% DV or less is low; 20% DV or more is high for a nutrient.
  6. Ingredient list: ordered by weight (most first). Short lists of recognizable foods generally beat long lists with multiple sugars and additives (see Processed and Ultra-Processed Foods).

Watch for marketing on the front of the package ("natural," "low-fat," "made with whole grain") — these are weakly regulated; the Nutrition Facts panel and ingredient list are the reliable sources. Compare similar products side by side using per-serving (or per-100 g) values.

Key facts

  • Read serving size first — all values are per serving.
  • Then calories; limit saturated fat, sodium, added sugars (now listed separately).
  • Aim to get fiber, vitamin D, calcium, iron, potassium.
  • %DV: ≤5% is low, ≥20% is high per serving.
  • Ingredients listed by weight; front-of-pack claims are weakly regulated.

Connections

Go deeperSetting Calorie Targets for Fat Loss, Maintenance, and Gain

Sources

Cited in text — not yet linked
US FDA Nutrition Facts label (final rule, 2016; compliance 2020) — added-sugars line, %DV, updated serving sizes.

See how this applies in practice, with honest limits on what the plan changes.

Build my planYour plan sets calorie and protein targets from your body, activity and goal by a fixed formula. This lesson explains the reasoning; reading it doesn’t change them.Save the lessonFree account · keeps it in your LibraryAsk a question about thisAnswers cite the Library’s own articles

Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.

Explore related topics

Atlas Connections

Added Sugars
Added sugars are sugars put into foods during processing; the current (2025–2030) federal guidelines recommend no amount of them and no more than 10 g in any one meal.
Setting Calorie Targets for Fat Loss, Maintenance, and Gain
Estimate maintenance, then pick a rate rather than a number: lose about 0.5–1% of body weight per week, or gain about 0.25–0.5% per week. Start near maintenance ±500 kcal, then let your 2–3 week weight trend tell you whether to adjust.
Dietary Fats — Saturated, Unsaturated, and Trans
Fat is the most energy-dense macronutrient (9 kcal/g); favor unsaturated fats, keep saturated fat under 10% of calories, and avoid industrial trans fat.
Portion Estimation
Hand-based portions and the plate method let you control intake without weighing every meal — a palm of protein, a fist of carbs, a thumb of fats.
Processed and Ultra-Processed Foods
"Processing" spans a spectrum; the concern is ultra-processed foods, which are calorie-dense, easy to overeat, and crowd out nutrient-dense whole foods.
Sodium and Blood Pressure
Sodium is an essential electrolyte, but typical intakes far exceed the <2,300 mg/day guideline, raising blood pressure — mostly from processed and restaurant foods.