Milk (whole) — 61 kcal

Milk has nourished human civilizations for over 10,000 years — ever since the genetic mutation for lactase persistence spread through pastoral populations in Europe, Africa, and the Middle East. A glass of whole milk (100 g) delivers 61 kcal, 3.2 g of protein, 3.3 g of fat, and 4.8 g of carbohydrates (almost entirely lactose). It remains one of the most nutritionally complete single foods available, providing a balanced matrix of macronutrients, minerals, and vitamins in a form the body absorbs with remarkable efficiency.

What's Inside

Calcium is the headline mineral at 113 mg per 100 g — about 11% of the Daily Value — bound within a casein-phosphopeptide matrix that dramatically increases absorption compared to calcium supplements. Phosphorus (84 mg) works in lockstep with calcium to form hydroxyapatite, the mineral crystal that gives bones and teeth their rigidity. Riboflavin (0.169 mg, 13% DV) is essential for the flavin-dependent enzymes that drive mitochondrial energy production and red blood cell recycling. Vitamin B12 (0.45 mcg, 19% DV) supports nerve function and DNA synthesis. Vitamin D (1.3 mcg) — often fortified in commercial milk — enhances calcium absorption by up to 40%. Potassium (132 mg) helps regulate blood pressure, and vitamin A (46 mcg RAE) supports vision, immune function, and skin integrity. Selenium (3.7 mg) provides antioxidant support, zinc (0.4 mg) aids immune defense, and sodium (43 mg) is naturally present in modest amounts. Cholesterol is low at 5 mg per 100 g. The sugar content of 5.1 g is naturally occurring lactose, which also acts as a prebiotic in the gut.

Getting It Right

For drinking, whole milk's fat content gives it body and mouthfeel that reduced-fat versions cannot match — the fat also aids absorption of vitamins A and D, which are fat-soluble. When heating milk for sauces or hot chocolate, warm it gradually over medium-low heat and stir frequently to prevent scorching; a skin forms on the surface when proteins denature at around 70 °C (158 °F), which is harmless but unappetizing. For the creamiest overnight oats, use whole milk as the soaking liquid and add yogurt for extra tang. Milk froths best for lattes at about 60-65 °C (140-150 °F) — higher temperatures scald the lactose and produce a burnt taste. Store milk at 1-4 °C (34-39 °F) in the back of the refrigerator, never in the door where temperatures fluctuate. Use within 5-7 days of opening. For those who are lactose intolerant, lactose-free milk is simply regular milk with added lactase enzyme — nutritionally identical but digestible.