Underweight refers to a condition where one’s bodyweight falls below the normal range. Too low a bodyweight is not considered healthy as it prevents the normal functions of our body. It may be related to Hyperthyroidism, Tuberculosis, gastrointestinal or liver problems, Anorexia Nervosa, anaemia, menstrual problems, infertility, Osteoporosis and other complicated diseases. Severely underweight individuals become malnourished as they lack vital nutrients essential for life. They have poor physical stamina and a weak immune system, leaving them vulnerable to infection. People become underweight either because they are not getting enough calories to fuel their body or their metabolic system is not absorbing enough nutrients from food. The condition is usually caused by genetic factors, too much physical activity, unhealthy diet, incorrect eating habits, hormonal imbalances, metabolic disorders, side effect of certain medicines and psychological disorders. Low body weight can be addressed through correct and balanced diet, calorie-conscious eating habits and proper exercise. A thorough evaluation is also necessary to eliminate any underlying medical condition. However, effective solution has been achieved through Fundamentals of Ayurveda, Unani and Therapeutic Yoga which is completely safe and natural. 'Naturoveda Health World' successfully employs a unique combination of these three systems to provide effective and proper results without any adverse effect.