In rats, eating a diet super high in fat and very low in carbs for a month leads to higher blood sugar and more fat in the liver—even if they're not eating too many calories.

Rats on a very low-carb, high-fat diet for a month ended up with higher blood sugar and more fat in their livers—even if they didn’t eat more calories. This kind of diet might not be great for liver and blood sugar health in animals.

Even when rats eat fewer calories, a keto-like diet can still cause unhealthy changes in the liver, like making too much sugar and having trouble breaking down proteins.

Even when rats eat fewer calories, a keto-like diet can still cause liver problems — like making too much sugar and messing up how the body uses protein — so the weight loss might not be worth the harm.

A special low-carb diet for 12 weeks helps overweight people with diabetes lose fat from their liver, making their liver healthier.

For overweight people with a fatty liver condition not caused by alcohol, eating fewer carbs and calories might lower some fat levels in their blood, but it doesn't seem to change other cholesterol or sugar levels much, according to a small study.