Yogurt: Benefits, Nutrition Facts and What Labels Mean

Yogurt is milk that has been pasteurized and then fermented by two lactic acid bacteria, which turn part of the milk sugar into lactic acid and give the familiar tang and thick texture. In USDA data, a cup of plain yogurt brings protein, calcium, phosphorus, riboflavin and vitamin B12, with no fiber and a fat content that depends on the milk used. The biggest nutrition swing between cups is not the fat, though; it is added sugar in flavored and fruit styles. This guide covers yogurt nutrition by type, what the federal standard and the live cultures statement actually mean, the evidence behind common yogurt benefits, lactose and allergy facts, and how to read a label.

Peptide Labs does not sell yogurt or yogurt products. This article is general nutrition information, not medical advice.

What yogurt is, according to the FDA standard

In the United States, the word yogurt on a label is governed by a federal standard of identity, 21 CFR 131.200, last revised in 2021. It requires dairy ingredients that are pasteurized or ultra-pasteurized before culturing, and two characterizing bacteria: Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus. Makers may add other cultures, fruit, sweeteners and flavors, and the fat level sets the name: yogurt made from whole milk, low fat yogurt or nonfat yogurt.

The standard also covers cultures after fermentation. Yogurt may be heat-processed after culturing to extend shelf life, and then its label must state that it does not contain live and active cultures. A “contains live and active cultures” statement is allowed only when the product has at least 10 million colony-forming units in each gram at manufacture and can be expected to keep at least 1 million in each gram through its stated shelf life. Strained styles such as Greek yogurt and skyr start the same way and then lose much of the liquid whey, which concentrates protein.

Yogurt nutrition by type (USDA)

The table uses USDA SR Legacy entries per cup (245 g) unless noted, with percent Daily Value from FDA reference amounts. FDC numbers let you check each row in USDA FoodData Central. For plain yogurt, the sugars listed are the milk sugars that are naturally present; in the vanilla and fruit rows most of the extra sugar is added.

A few patterns stand out. Low fat and skim plain yogurts list more protein and calcium per cup than the whole milk entry in USDA data. The same low fat cup also gives riboflavin of 0.52 milligrams (40% of the Daily Value) and phosphorus of 353 milligrams (28%) in USDA SR Legacy. Plain yogurt has no fiber at all, and its vitamin D is close to zero in these USDA entries: NIH ODS notes that some yogurts have added vitamin D, so check the Nutrition Facts panel rather than assuming it matches fortified milk. Strained Greek yogurt trades some calcium for a much higher protein count. For more calcium sources, see foods high in calcium; for B12, see our B12 foods list.

Yogurt benefits: what the evidence supports

Most well-supported yogurt benefits are about nutrients rather than special effects. A plain cup is a compact source of protein, calcium, phosphorus, potassium, riboflavin and vitamin B12, and the Dietary Guidelines for Americans place yogurt in the dairy group alongside milk and cheese. The 2020-2025 edition favored fat-free and low fat choices; the 2025-2030 edition says that when you eat dairy, include full-fat dairy with no added sugars. Both editions keep the limit of saturated fat under 10 percent of daily calories, which matters when comparing the whole milk row above.

The second claimed benefit is easier lactose digestion. A 2014 review by Savaiano in the American Journal of Clinical Nutrition explains that the lactose in yogurt is digested more efficiently than the lactose in milk, because the live bacteria in yogurt help break it down. That is one reason NIDDK suggests people with lactose intolerance try yogurt.

The third is gut health, and here the wording matters. The International Scientific Association for Probiotics and Prebiotics (ISAPP) separates cultured foods from probiotics. In its 2021 consensus statement, a food can be described as containing live and active cultures only if it has not been processed to remove or kill the microbes, and it should be called a source of probiotics only when defined live strains have evidence of a benefit. Yogurt starter cultures are not automatically probiotics. If you want the strain-level view, read prebiotic vs probiotic and how to choose a probiotic; for the wider category of cultured foods, see our fermented foods guide.

Is yogurt healthy? It depends on the cup

So, is yogurt healthy? Plain yogurt fits easily into the eating patterns the Dietary Guidelines describe. The catch is sugar. In USDA data the fruit low fat entry lists 46.7 grams of sugars per cup against 17.2 grams for plain low fat, and the vanilla entry sits at 33.8 grams. Since plain yogurt’s sugar is milk sugar, the gap is mostly added sugar. The Nutrition Facts panel now lists added sugars on its own line, which makes the comparison simple.

• Look at added sugars first. Plain yogurt lists zero added sugars; you can add fruit yourself.
• Check for the live and active cultures statement if cultures matter to you, and avoid cups labeled as not containing them.
• Compare protein per container, not per cup, since cup sizes range from 4 to 8 ounces.
• Fat level is a preference. Whole milk yogurt has more saturated fat; nonfat has almost none.
• Vitamin D varies. Some brands add it and many do not, so read the panel.

Other cultured dairy foods follow the same rules of thumb: kefir is a drinkable fermented milk with a wider mix of microbes, lassi is a yogurt drink, and cottage cheese is a fresh cheese with a similar protein profile. Plain dairy milk nutrition is covered in our companion guide.

Lactose, milk allergy and safety

• Lactose intolerance: NIDDK says many people with lactose intolerance can handle some lactose without symptoms, and suggests trying yogurt and hard cheeses. Lactose-free yogurts are an option; for enzyme products, see our lactase guide.
• Milk allergy: milk is one of the nine major food allergens under US law. A milk allergy is an immune reaction to milk proteins, not a digestion problem, so yogurt is not a safe swap.
• Raw milk yogurt: the FDA standard requires pasteurized dairy. FDA and CDC warn that raw milk and products made from it can carry Listeria, Salmonella, E. coli and Campylobacter, with higher risk for pregnant women, young children, older adults and people with weakened immune systems.
• Plant-based yogurts: soy yogurt fortified like milk counts toward the dairy group in the 2020-2025 Dietary Guidelines; other plant yogurts vary widely in protein and calcium.

Frequently Asked Questions

Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Last reviewed October 2026.

Related guides: Milk Nutrition: Whole vs Skim Milk and Is Milk Good for You, Greek Yogurt: USDA Nutrition, Protein and Greek vs Regular Yogurt, Kefir Benefits: What Kefir Is, the Evidence and Kefir vs Yogurt, Types of Yogurt: FDA’s Standard, Greek-Style Entries and USDA Data.