Answer:
proteins help you gain muscle because of the amino acids found in them.
proteins also carry antibodies, which help fight against infection, which eventually leads to muscle. Overall, proteins are super impotrtant.
Step-by-step explanation:
Here are some foods that contain amino acids to help you gain muscle
meat and fish
eggs
dairy products
seeds and nuts
legumes like beans and lentils.
(My last answer got removed for "copyright" even though I typed it myself, so I made another ;)