While many people are aiming to lose weight, others are looking to gain it. There are several reasons for wanting to gain weight. If you’re classified as underweight according to your body mass index (BMI), your healthcare provider or registered dietitian may recommend that you gain weight. Alternatively, if you’re an athlete, you may want to gain weight — ideally in the form of muscle mass — to perform better at your sport. Similarly, if you’re a bodybuilder or into powerlifting, you may desire to gain weight for increased muscle size and strength. Some people may also require to gain weight due to certain conditions like malnutrition, hyperthyroidism recovery from surgery,etc.