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.

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.

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.

Meals with more protein tend to make people eat less at their next meal.

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.

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.