For athletes who need to make weight (like wrestlers or boxers), eating low-carb and high-fat for a long time might help them lose fat without losing muscle, which is safer than starving or sweating...

Eating fewer carbs and calories helps overweight people lose weight by improving how their bodies process energy. This finding is from the abstract summary - full study details were not available

Adding high-intensity interval training to a very low-carb diet doesn't stop the muscle loss that happens when people with excess body fat eat very few carbs for 12 weeks.

If you're a middle-aged adult with extra weight, eating either a low-carb high-fat diet or a low-fat diet with fewer calories can help you keep your muscle while losing weight over about 4 months.

Eating very few carbs and more fats for 12 weeks makes the dangerous belly fat around organs shrink by about a quarter in people who have too much body fat.