Muscle-building and fitness diet is not only to eat more fruits, but also to eat enough nutrition in a balanced way.
You should eat high-quality food rich in carbohydrates and protein, and eat five or six meals a day. You need to eat 6 grams of carbohydrates and 1.8 grams of protein every day for a weight of about one kilogram. For example, the body weight 120kg, and the daily intake of enough carbohydrates and 100g of protein.
Foods rich in carbohydrates are: rice, noodles, steamed bread, potatoes, sweet potatoes and so on.
Protein-rich foods include: egg white, chicken breast, beef, shrimp and so on.
How to eat specifically, you can see more about Zhuo Shu's weight gain sharing.