Straining is the whole trick. Regular yogurt is about 85% watery whey. Pull that off and what stays holds 9 to 12 grams of protein per 100 grams at around 60 kcal, versus 4 grams in regular yogurt ¹.

Most of that protein is casein, the slow kind: it curdles in your stomach and drips amino acids into your blood for six to eight hours ², which is why a dose before bed works. And the live cultures digest the milk sugar for you, using the enzyme your own gut stops making if you're lactose intolerant — the one yogurt health claim regulators have actually endorsed ^{3 4}.

The evidence is strongest on appetite and overnight muscle repair. Protein is the most filling macronutrient, so swapping a low-protein snack for a high-protein one changes what you eat all day ⁵. Women given a 200 kcal Greek-yogurt snack felt less hungry all evening and ate less at dinner than those given a same-calorie chocolate bar ⁶.

Eaten before bed, casein keeps overnight repair fed. A 40-gram dose before sleep raised whole-body protein synthesis 22% overnight, and twelve weeks of lifting with that pre-sleep dose built more muscle and strength than the same training without it ^{7 8}. And across a 120,000-person cohort, yogurt was the food that best predicted the least weight gained over decades ⁹.

A healthy adult wants roughly 1.2 to 1.6 g of protein per kilo per day ^{11 12}; one tub covers a fifth of that, no cooking.

First week: the between-meal crash flattens and you sit down to dinner hungry, not desperate. A month in, if you lift, the morning after a hard session stops feeling like a wreck. By three months, the scale may barely move while body composition shifts, as the twelve-week trials measured ⁸. Over decades, keeping protein and calcium up through midlife tracks with less frailty later ¹³.