Ways to gain weight include the following: 1. Eat plenty of protein, the most important factor in gaining healthy weight is protein, muscle is made up of protein and allows most calories to be converted into body fat. 2. Supplement with plenty of carbohydrates, in order to gain weight, eat at least 3 meals a day and make sure they contain plenty of fat and carbohydrates as well as protein. 3. Eat energy-rich foods such as nuts, The company’s main goal is to provide the best possible service to its customers.