Causes of Obesity
Although there are genetic, behavioral and hormonal influences on body weight, obesity occurs when you take in more calories than you burn through exercise and normal daily activities. Your body stores these excess calories as fat.
Obesity can sometimes be traced to a medical cause, such as Prader-Willi syndrome, Cushings syndrome, and other diseases and conditions. However, these disorders are rare and, in general, the principal causes of obesity are:
• Inactivity. If youre not very active, you dont burn as many calories. With a sedentary lifestyle, you can easily take in more calories every day than you use through exercise and normal daily activities.
• Unhealthy diet and eating habits. Weight gain is inevitable if you regularly eat more calories than you burn. And most Americans diets are too high in calories and are full of fast food and high-calorie beverages.
Obesity usually results from a combination of causes and contributing factors, including:
• Genetics. Your genes may affect the amount of body fat you store, and where that fat is distributed. Genetics may also play a role in how efficiently your body converts food into energy and how your body burns calories during exercise.
• Family lifestyle. Obesity tends to run in families. If one or both of your parents are obese, your risk of being obese is increased.
• Inactivity. If youre not very active, you dont burn as many calories. With a sedentary lifestyle, you can easily take in more calories every day than you burn through exercise and routine daily activities. Having medical problems, such as arthritis, can lead to decreased activity, which contributes to weight gain.
• Unhealthy diet. A diet thats high in calories, lacking in fruits and vegetables, full of fast food, and laden with high-calorie beverages and oversized portions contributes to weight gain.
• Medical problems. In some people, obesity can be traced to a medical cause, such as Prader-Willi syndrome, Cushings syndrome and other conditions. Medical problems, such as arthritis, also can lead to decreased activity, which may result in weight gain.
• Certain medications. Some medications can lead to weight gain if you dont compensate through diet or activity. These medications include some antidepressants, anti-seizure medications, diabetes medications, antipsychotic medications, steroids and beta blockers.
• Social and economic issues. Research has linked social and economic factors to obesity. Avoiding obesity is difficult if you dont have safe areas to exercise. Similarly, you may not have been taught healthy ways of cooking, or you may not have money to buy healthier foods. In addition, the people you spend time with may influence your weight — youre more likely to become obese if you have obese friends or relatives.
• Age. Obesity can occur at any age, even in young children. But as you age, hormonal changes and a less active lifestyle increase your risk of obesity. In addition, the amount of muscle in your body tends to decrease with age. This lower muscle mass leads to a decrease in metabolism. These changes also reduce calorie needs and can make it harder to keep off excess weight. If you dont consciously control what you eat and become more physically active as you age, youll likely gain weight.
• Pregnancy. During pregnancy, a womans weight necessarily increases. Some women find this weight difficult to lose after the baby is born. This weight gain may contribute to the development of obesity in women.
• Quitting smoking. Quitting smoking is often associated with weight gain. And for some, it can lead to enough weight gain that the person becomes obese. In the long run, however, quitting smoking is still a greater benefit to your health than continuing to smoke.
• Lack of sleep. Not getting enough sleep or getting too much sleep can cause changes in hormones that increase your appetite. You may also crave foods high in calories and carbohydrates, which can contribute to weight gain.
Even if you have one or more of these risk factors, it doesnt mean that youre destined to become obese. You can counteract most risk factors through diet, physical activity and exercise, and behavior change
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