- Proteins are composed of long chains of building blocks called amino acids, which are linked with strong bonds that take a lot of effort to break. This means the body has to work really hard to process proteins and so they stay in the stomach longer than fats or carbohydrates. In turn, this means the stomach empties more slowly, helping to keep us fuller for longer so we find it easier to stick to our diet.
- Meanwhile, because the body has to work harder to break down proteins, it burns up more calories in doing so. So for example, when we consume 100 calories from protein, the body uses 30 calories to process it and so in reality we only get 70 calories. In contrast, the body only uses 12 calories to process 100 calories from fat; and just seven calories to process 100 calories from carbs. This means if we eat 1,500 calories of pure protein, in reality we only get 1,050 calories.
- Complementing this high protein intake, carbs should be severely limited because they cause the secretion of insulin. Insulin controls blood sugar levels and encourages the storage of fat.
- When carbohydrates are absent, the body switches to burning fat as its primary source of fuel.
Statements courtesy of