Eating fewer carbs can make you feel fuller and eat less overall — which might make it harder to gain muscle because building muscle needs extra calories.

Carbohydrate intake has no significant effect on muscle hypertrophy when protein and total energy intake are held constant.

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

Eating more carbs doesn’t make your muscles grow bigger when you’re already getting enough protein and calories — your muscles respond more to lifting weights than to how many carbs you eat.

We can’t say for sure if carbs help build muscle — the data is too shaky. It might help a little, but we just don’t have strong enough proof yet.

Whether you cut fat or carbs, if you eat the same number of calories, you’ll lose about the same amount of weight.