WeeSlim – Another big problem with programs that focus strictly on weight loss is that you simply lose belly fat fast while losing muscle just as quickly. If you want to maximize how many calories your workouts burn, then you must keep in mind that “timing is everything. 

Because the level of your body’s stored carbohydrates is extraordinarily low at that time, your body will get its energy from fat. And the much energy it gets from the fat, the more you can be ready to burn. 

https://www.healthnutra.org/fr/weeslim/