If you're overweight and eat a lot of protein—especially from whey—for a month, your blood sugar might go up a bit, but only if you're also eating very little saturated fat. If you eat more saturated...

If you're overweight, eating a lot more protein — especially from whey — for a month won't help your body use insulin better unless you're also losing weight.

If you're overweight or obese and eat the same number of calories, boosting protein or saturated fat from dairy for a month doesn't seem to hurt your blood sugar control or cholesterol levels.

Among overweight or obese adults losing weight on a calorie-restricted diet, consuming 30% of calories from protein preserves muscle mass, while consuming 20% protein with a low-glycemic-index diet leads to greater muscle loss.

Among overweight or obese adults on a 4-week calorie-restricted diet, consuming 30% of daily calories from protein results in 4.6 kg more fat loss than a low-glycemic-index diet, with no loss of muscle mass.

When healthy young adults eat a low-carbohydrate diet that is higher in protein instead of higher in fat, their blood glucose levels after eating are lower two hours later.