Among all body types, a person with a mesomorph body type can gain muscle or weight quickly. Not to mention, these body types can also lose weight quickly as they are easy to gain fat.u003cbr/u003eUsually, people with this body type get effective results during weight training. It is much easier for these people to build muscle. However, a diet plays a crucial role. One should go for a diet focused on vegetables, fruits, beans, low-fat dairy, and whole grains. If one is non-vegetarian, then go for skinless chicken, fish, and eggs.