What should I eat?

That's allot to go over...there are a lot of diet plans out there for bulking that can give you a good idea

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Ckicken steak ground beef whole eggs almonds white rice potatoes macadamia oil or some kind of healthy oils. Milk and peanut butter. If its hard to gain weight then eat those foods and maybe throw in some deserts to help out. Protein shakes once a day if u must have them