For overweight or obese teenage girls, eating breakfast—whether high-protein or normal-protein—lowers hunger and increases fullness during the day compared to skipping breakfast. A high-protein...

Among overweight or obese teenage girls who typically skip breakfast, eating a breakfast high in protein leads to about a 25% reduction in evening consumption of high-fat snacks, even when total daily calorie intake remains unchanged.

Among overweight or obese teenage girls who skip breakfast, eating a high-protein breakfast does not lead to a lower total calorie intake over the day, because they tend to eat more later to make up for the missed calories.

Among overweight or obese adolescent girls who skip breakfast, eating a morning meal with 35 grams of protein from eggs and beef reduces hunger, increases fullness, alters hunger-related hormones, and reduces evening snacking on high-fat foods compared to skipping breakfast or eating a low-protein cereal breakfast, without changing total daily calorie intake.

Eating a high-protein breakfast might make people feel a bit fuller during the day, but the evidence isn't strong enough to be sure.

These results only apply to healthy, young, professional adults — we don’t know if they’d work for older people, shift workers, or those with health problems.