>>35
It does eat both muscle and fat, whether fasting or keto diet.
Fasting and keto both help secrete growth hormones, which preserve muscle.
Gluconeogenesis is another mechanism by which the body creates glucose in a keto diet.
It essentially means the breakdown of muscle to make glucose.
The body tries to avoid this process though.
This is why you "must" have 20% protein on keto, otherwise your body will do more gluconeogenesis.
The only way to get away with eating more protein is to do more resistance training.
Although, new research has shown gluconeogenesis to be linear to protein intake up to a certain point, where it just stops and fat is used instead.
Skewing towards lower fat and higher protein for a short period helps with body recomposition as well.
tldr; dont be afraid of protein on keto