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\nEnergy imbalances, somegenetic or endocrine medical conditions, and certain medicines are known to cause overweight or obesity.
\nEnergy imbalances can cause overweight and obesity. An energy imbalance means that your energy IN does not equal your energy OUT. This energy is measured in calories. Energy IN is the amount of calories you get from food and drinks. Energy OUT is the amount of calories that your body uses for things such as breathing, digesting, being physically active, and regulating body temperature.
\nOverweight and obesity develop over time when you take in more calories than you use, or when energy IN is more than your energy OUT. This type of energy imbalance causes your body to store fat.
\nYour body uses certain nutrients such as carbohydrates or sugars, proteins, and fats from the foods you eat to:
\nThe amount of energy that your body gets from the food you eat depends on the type of foods you eat, how the food is prepared, and how long it has been since you last ate.
\nThe body has three types of fat tissue\u2014white, brown, and beige\u2014that it uses to fuel itself, regulate its temperature in response to cold, and store energy for future use. Learn about the role of each fat type in maintaining energy balance in the body.
\nSome genetic syndromes and endocrine disorders can cause overweight or obesity.
\nSeveral genetic syndromes are associated with overweight and obesity, including the following.
\n \nThe study of these genetic syndromes has helped researchers understand obesity.
\nBecause the endocrine system produces hormones that help maintain energy balances in the body, the following endocrine disorders or tumors affecting the endocrine system can cause overweight and obesity.
\nMedicines such as antipsychotics, antidepressants, antiepileptics, and antihyperglycemics can cause weight gain and lead to overweight and obesity.
\nTalk to your doctor if you notice weight gain while you are using one of these medicines. Ask if there are other forms of the same medicine or other medicines that can treat your medical condition, but have less of an effect on your weight. Do not stop taking the medicine without talking to your doctor.
\nSeveral parts of your body, such as your stomach, intestines, pancreas, and fat tissue, use hormones to control how your brain decides if you are hungry or full. Some of these hormones are insulin, leptin, glucagon-like peptide (GLP-1), peptide YY, and ghrelin.
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