Fat doesn’t make obese men feel as full or eat less as it does in lean men, meaning their bodies respond differently to fatty foods.

When lean men eat meals with more fat or protein instead of lots of carbs, they feel less hungry, fuller longer, and end up eating less food later.

Even small changes in how much protein is in a meal — not huge amounts — can help people feel fuller and eat less, whether they’re lean or obese.

Even when men ate the same number of total calories, those who ate fewer meals were still more likely to be obese, meaning it’s not just about how much they eat, but when and how often.

Obese men feel less hungry after eating high-protein meals and eat less afterward when they eat meals with more protein, no matter if it's high-protein or just enough protein.