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Milk types

What is milk?

Quick answer

Under US FDA rules, milk is the lacteal secretion, practically free of colostrum, obtained by the complete milking of one or more healthy cows. Milk sold as a beverage must contain at least 3 1/4 percent milkfat and 8 1/4 percent milk solids not fat, and be pasteurized (21 CFR 131.110).

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In this article
  1. What counts as milk in the US?
  2. What must milk contain?
  3. What is in a cup of whole milk?
  4. Is plant milk also milk?

What counts as milk in the US?

The FDA standard of identity (21 CFR 131.110) defines milk as the lacteal secretion, practically free from colostrum, obtained by the complete milking of one or more healthy cows. Milk in final package form for beverage use must be pasteurized or ultrapasteurized.

What must milk contain?

The standard requires not less than 3 1/4 percent milkfat and not less than 8 1/4 percent milk solids not fat. Adding vitamin A and vitamin D is optional. When added, each quart must contain not less than 2,000 IU of vitamin A (if vitamin A is added) and 400 IU of vitamin D (if vitamin D is added).

What is in a cup of whole milk?

USDA FoodData Central lists whole milk (3.25% milkfat, with added vitamin D) at 61 kcal, 3.15 g protein, 3.25 g fat and 113 mg calcium per 100 g. USDA’s cup weight is 244 g, so a cup is about 149 kcal (our calculation).

Is plant milk also milk?

The standard above covers milk from cows. We did not find a definition of plant drinks such as almond or oat drinks in the pages we read, so this post makes no claim about them. Goat and sheep milk are not covered by this definition either.

People also ask

What is milk?

In the US, milk is the lacteal secretion, practically free from colostrum, from the complete milking of one or more healthy cows (21 CFR 131.110).

How much fat must milk contain?

At least 3 1/4 percent milkfat and 8 1/4 percent milk solids not fat under the FDA standard.

How many calories are in a cup of whole milk?

About 149 kcal, our calculation from USDA's 61 kcal per 100 g and a 244 g cup.

General information only, not medical advice. If you have a health condition or are pregnant, ask your doctor before changing what you drink.

Sources

  1. 21 CFR 131.110 Milk (federal regulation text), read via Cornell LII 5 Nov 2026
  2. USDA FoodData Central: Milk, whole, 3.25% milkfat, with added vitamin D (FDC 171265), read via API 5 Nov 2026
Written by Drinks Type Editorial Team · Published Jun 27, 2025 · Updated Nov 5, 2026
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