Protein fills you up, at least meal to meal
At the same calories, higher-protein meals reduced hunger and increased fullness, and moved appetite hormones the right way. That held for single meals. The long-term trials didn't show a clear effect. So protein helps you get through the day; whether it makes the whole diet easier is less certain.
Eat more food, not more calories
Both groups cut fat. One group was also told to eat more water-rich foods, mostly fruit and vegetables. With no calorie targets, that group ate a greater weight of food, lost more weight, and reported less hunger.
Living in a research ward and eating as much as they wanted, people ate about 500 kcal a day more on an ultra-processed diet than on an unprocessed one, even though the meals offered were matched for calories, sugar, fat, fibre and salt. They gained 0.9 kg in two weeks on one and lost 0.9 kg on the other.
Sleep is part of the diet
The same diet for two weeks, with 8.5 or 5.5 hours in bed. On short sleep, people lost less than half as much fat, lost more lean mass, and were hungrier.
None of these are lifters in a deficit. Kohanmoo pooled healthy adults. Ello-Martin studied women with obesity. Hall studied 20 weight-stable adults for two weeks each way, not dieters. Nedeltcheva had only 10 people. Each one is small or indirect on its own. Together they point in the same direction, and none of the advice carries any risk.
What to do
- Protein at every meal: about 0.4 g/kg (more here).
- Half the plate vegetables or fruit. More food on the plate for the same calories.
- Build meals from whole foods. Ultra-processed snacks are the easiest calories to over-eat.
- Protect 7–9 hours of sleep. Short sleep makes everything harder.
- Starving all day? The deficit may be too big. Check your rate of loss, or plan a diet break.
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