Maintaining one's weight is a key factor in remaining healthy. The ideal weight of a person depends on the person's height. A BMI (body mass index) of your body would give you an idea if you are either under weight or over weight. A BMI of less than 20, states that you are under - weight. There is a thin line between being under – weight and being malnourished. People who are under – weight lack food calories in their body and those who are malnourished lack food nutrients and suffer from a health risk. It is a myth that under – weight people should consume high calorie food as this would help them gain weight. This would lead to unhealthy fats being stored in the body. If one is planning to gain weight, they should look for healthy ways to gain weight. One should consult either a dietician or nutritionist who will study their medical history and bodily requirements and accordingly suggest a treatment plan. Depending on your taste palette your dietician/nutritionist would prescribe you a diet which would cause weight gain in a healthy way. One should keep away from harmful drugs to gain weight which are available in the market as they not only have side effects but can also damage your kidneys.