Genetic, environmental, psychological, and other factors may all play a role in the development of obesity.

Obesity tends to run in families, suggesting a genetic cause. But genes do not destine people to a lifetime of obesity. Although you cannot change your genetic makeup, you can change your eating habits and levels of activity.

Environmental factors strongly influence obesity. This includes lifestyle behaviors such as what you eat and your level of physical activity. Most Americans do not get enough physical activity. Many also tend to eat high-fat foods, and put taste and convenience ahead of nutrition.

Psychological factors may also influence eating habits. Many people eat in response to negative emotions such as boredom, sadness, or anger. Up to 10 percent of people who are mildly obese -- and even more who are severly obese -- have binge eating disorder. Those with the most severe binge eating problems are also likely to have symptoms of depression and low self-esteem.

Some illnesses also can lead to obesity, including hypothyroidism, Cushing's syndrome, depression, and certain neurological problems that can lead to overeating. Also, drugs such as steroids and some antidepressants may cause weight gain.

All information provided in this site is offered for educational purposes only, and it is not intended nor implied to be a substitute for professional medical advice. Always consult your own physician or healthcare provider with any questions you may have regarding a medical condition