Nutrition Facts Guide

In This Article

  1. How do you read a nutrition facts label correctly?
  2. How much protein do you actually need per day?
  3. Are dietary supplements necessary for most people?
  4. What is the difference between whole grain and refined grain?
  5. How do you identify hidden sugars on a label?
  6. Frequently Asked Questions
Understanding nutrition facts means knowing how to read a food label, what macronutrients your body actually needs, and which claims are backed by evidence versus marketing. This guide covers label reading, daily requirements from USDA Dietary Guidelines, and the most common nutrition questions we get from home cooks.

How do you read a nutrition facts label correctly?

Start at the top. The serving size determines every number below it. If the serving size is 1 cup and you eat 2 cups, double everything. The FDA standardized serving sizes in 2020, but they still do not always match what people actually eat. Check the serving size first, every time.

The percent daily value column on the right tells you whether a nutrient amount is low or high per serving. The FDA defines 5% DV or less as low and 20% DV or more as high. Use this as a quick filter. For a detailed walkthrough, see our guide on reading nutrition labels for weight loss.

Nutrient What to look for Daily reference (2,000 cal diet)
Total calories Per serving, not per container 2,000 (varies by individual)
Protein Higher is generally better 50g DV
Total fat Check saturated and trans fat specifically 78g (less than 10% from saturated)
Sodium Keep below 20% DV per serving 2,300mg
Dietary fiber Aim for 20% DV or more per serving 28g
Added sugars Keep below 10% of total calories 50g maximum

How much protein do you actually need per day?

The USDA Dietary Reference Intake is 0.36 grams per pound of body weight for sedentary adults. That is 54 grams for a 150-pound person. Active individuals and older adults benefit from 0.5 to 0.7 grams per pound. Most Americans already exceed the minimum without trying. The cheapest high-protein foods can help if you need to increase your intake on a budget.

Are dietary supplements necessary for most people?

For most adults eating a varied diet, the answer is no. The Dietary Guidelines for Americans 2020-2025 recommend getting nutrients from food first. The exceptions where supplementation has clear evidence: vitamin D (especially in northern latitudes), B12 for vegans, folate during pregnancy, and iron if diagnosed with deficiency by a healthcare provider.

What is the difference between whole grain and refined grain?

Whole grains contain the entire kernel: bran, germ, and endosperm. Refined grains have the bran and germ removed, stripping most of the fiber and many nutrients. The FDA requires enriched refined grains to add back some B vitamins and iron, but the fiber is not replaced. When the label says “enriched wheat flour,” that is refined.

How do you identify hidden sugars on a label?

The 2020 FDA label update now separates “added sugars” from total sugars, which helps. But in the ingredients list, sugar appears under dozens of names: high fructose corn syrup, dextrose, maltose, cane juice, agave nectar, rice syrup, and barley malt. If multiple sugar names appear in the first five ingredients, the product is sugar-heavy regardless of what the front label claims.

All nutrition data in our guides is sourced from USDA FoodData Central and verified against the Dietary Guidelines for Americans 2020-2025. For details on our fact-checking process, see How We Research.

Frequently Asked Questions

Brown rice has more fiber (1.8g vs 0.6g per cup) and slightly more vitamins because the bran layer is intact. White rice is enriched with iron and B vitamins. The calorie difference is negligible. Brown rice is better for blood sugar control; white rice is better for digestibility. Neither is a bad choice.

Some water-soluble vitamins (C, B vitamins) decrease with cooking, especially boiling. Fat-soluble vitamins (A, D, E, K) are largely unaffected. Steaming and roasting retain more nutrients than boiling. But cooked vegetables are still nutritious, and cooking makes some nutrients (like lycopene in tomatoes) more bioavailable.

The FDA defines natural flavors as substances derived from plant or animal sources used for flavoring, not nutrition. The term covers hundreds of compounds and tells you very little about what is actually in the product. It is not a health claim in either direction.

Sources

  1. USDA FoodData Central — Accessed September 2026
  2. Dietary Guidelines for Americans 2020-2025 — Accessed September 2026
  3. FDA — How to Understand and Use the Nutrition Facts Label — Accessed September 2026