which food group are needed for muscle?

Answer 1

Proteins are key, but all are needed for good general health, which helps a body build and maintain muscle.

Answer 2

Primarily proteins,  specifically the proteins that the liver cannot manufacture called the essential amino acids. 

Meat,  dairy, etc.

Plant wise,  legumes are the best bet for a poor choice.   Your morals cannot alter your DNA.

At least not yet.

Answer 3

Proteins mainly but carbs and fats help as well as far as energy for your workouts and hormonal balance.  You also need to be lifting heavy 4-6 days a week if possible...