You are going to need lots of good foods to get you on your way. You want to choose food types that will take you directly to your goal. Skinny guys will want to consume anywhere from an additional 500 to 1000 calories a day. This will help you gain mass.
Once you have this it can be converted to muscle. Big guys will just need to focus on eating the right kinds of foods. Everyone should be eating carbohydrates, healthy fats and protein. You should be getting your protein from lean meats. These would include chicken, beef, and fish. Make an effort to eat one of these everyday.
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