Dairy
Dairy products include milk and eggs. Studies have shown that daily consumption of dairy foods can cause a significant increase in muscle mass and body weight. This class of foods is a healthy option for those looking to gain a healthy weight. However, up to sixty percent of the world population is at a risk of being lactose intolerant, which causes an allergic reaction hours after eating a dairy product.
For those that are lactose tolerant and do not experience any of the digestive problems associated with lactose intolerance, they can enjoy nutritious dairy foods for healthy weight gain.