Milk

Pick the record that matches the carton in your hand. Per 100 g, whole milk runs 60 calories and 3.2 g of fat. The 2% record runs 50 calories and 1.9 g of fat. The 1% record runs 43 calories and 1 g of fat. The nonfat record runs 34 calories and 0.1 g of fat. Protein moves the opposite direction and by a much smaller amount, from 3.3 g per 100 g on whole milk up to 3.4 g on nonfat. A generic "milk" entry in a tracker is usually pinned to one of these four, and if it is not the one in your fridge, a full cup logged against it is wrong by up to 65 calories.

Coffee and cereal are where the pour goes unlogged, and they are also where it is smallest per instance and largest in aggregate. A splash in a coffee and a pour over cereal are not full cups, so neither one alone moves a day's numbers much. The failure mode is that both happen daily, several times a day for the coffee, and neither gets a gram weight attached to it. Weigh one typical pour once on a kitchen scale, write down the gram figure, and log that fixed amount every time instead of estimating fresh each time.

A shake changes the record math more than the powder does. Mixing a scoop of protein powder with a cup of whole milk instead of water adds 149 calories and 8.1 g of protein from the milk alone, on top of whatever the powder contributes. Readers who track the powder religiously and treat the liquid as free are undercounting by a full serving's worth of dairy. Log the milk as its own line, at the record that matches the carton.

Sodium moves in the opposite direction from fat, and it is a small number regardless. The nonfat record carries 41 mg of sodium per 100 g against 38 mg for whole milk. Neither figure is large enough to change a sodium budget on its own, but a reader adding up several cups a day across coffee, cereal, and a shake should know the nonfat pour carries the most sodium of the four records despite carrying the fewest calories.

The fat-level ladder changes calories far more than it changes protein. Someone cutting on a fixed calorie budget who currently drinks whole milk in coffee three times a day can drop to the nonfat record and give up roughly 65 calories per cup for a 0.3 g difference in protein. That is close to a free swap. Someone trying to gain weight should run the ladder the other direction and stop reaching for the low-fat carton out of habit when the actual goal is more calories with less volume.

Recovery and pre-sleep contexts keep citing milk because it carries both major dairy proteins in one pour. Milk contains both whey and casein, the fast-digesting and slow-digesting fractions that show up separately in protein shake and protein oatmeal guidance. This page's records report total protein only, so the whey and casein split itself is described at casein, whey protein, and pre-sleep protein rather than here. What this page can tell you is that a 246 g cup carries 8.1 to 8.4 g of that total protein depending on which fat level you poured.

Milk on its own does not clear a per-meal protein target. At roughly 8 g per cup across all four records, milk covers a fraction of what a per-meal protein target asks for. Greek yogurt delivers more than double the protein in a comparable serving because straining concentrates it. Use milk to build a shake or a bowl, and expect a meal logged as milk alone to land well under the 25 to 30 g per-meal range most per-meal protein guidance asks for.

The record you log should match the reason you are drinking it. A cutting reader reaching for whole milk out of habit is paying calories for nothing the leaner records do not also deliver. A reader trying to gain who keeps buying skim is leaving calories on the table for the same reason. Check which record matches your goal before you check which one matches the carton in the fridge, and switch the carton when they disagree.