In the fight to lose weight, first one should try to understand the reasons behind the excessive weight gain. You gain weight when you consume more calories than you can burn. A minor calorie surplus leads to overweight, while a major energy surplus causes obesity. Though, genetic, environmental, psychological, and other factors also have a role to play behind this imbalance.

Diet Pills and an exercise- routine can help you lose weight. But one must understand what lies behind obesity.

Obesity tends to run in families, implying genetic factors. Children of obese parents have a 25-30 percent extra likelihood of becoming obese themselves. Obesity can be due to glandular or hormonal problems like clinical hypothyroidism, where there is not enough thyroid hormone to control normal rates of metabolism. Weight is affected by gender. Men have more lean body mass(muscle) and less fat than women. Lean body mass is more metabolically active and thus uses more energy (calories) than fat. Psychological factors like Depression and stress can lead to obesity. They are leading causes of eating disorders.And lastly, the lack of physical activity also leads to weight gain.

Drug Treatment for weight loss:

Doctors are increasingly turning to Diet Pills to deal with overweight and obesity. Most are "appetite-suppressant" medications which decrease appetite or increase the feeling of being full. Compared to these, Xenical (Orlistat) approved in 1999 by the Food and Drug Administration (FDA) works better by reducing the body's ability to absorb dietary fat by about one third.