Question: how to gain weight fast but healthy?
Answer: Homemade Protein Smoothies. Drinking homemade protein smoothies can be a highly nutritious and quick way to gain weight. ...  Milk. Milk has been used as a weight gainer or muscle builder for decades ( 1 ). ...  Rice. ...  Nuts and Nut Butters. ...  Red Meats. ...  Potatoes and Starches. ...  Salmon and Oily Fish. ...  Protein Supplements.