Obesity is an epidemic in the United States. This condition puts people at a higher risk for serious diseases, such as type 2 diabetes, heart disease, and cancer.
According to the Centers for Disease Control and Prevention (CDC), it’s estimated that in 2015–2016, 93.3 million (39.8 percentTrusted Source) American adults and 13.7 million (18.5 percentTrusted Source) American children and teens are clinically obese.
Obesity is defined as having a body mass index (BMI) of 30 or more. BMI is a calculation that takes a person’s weight and height into account. However, BMI does have some limitations.
According to the CDCTrusted Source, “Factors such as age, sex, ethnicity, and muscle mass can influence the relationship between BMI and body fat. Also, BMI doesn’t distinguish between excess fat, muscle, or bone mass, nor does it provide any indication of the distribution of fat among individuals.”
Despite these limitations, BMI continues to be widely used as an indicator of excess weight.
Eating more calories than you burn in daily activity and exercise (on a long-term basis) causes obesity. Over time, these extra calories add up and cause you to gain weight.
Common specific causes of obesity include:
- eating a poor diet of foods high in fats and calories
- having a sedentary (inactive) lifestyle
- not sleeping enough, which can lead to hormonal changes that make you feel hungrier and crave certain high-calorie foods
- genetics, which can affect how your body processes food into energy and how fat is stored
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- growing older, which can lead to less muscle mass and a slower metabolic rate, making it easier to gain weight
- pregnancy (weight gained during pregnancy can be difficult to lose and may eventually lead to obesity)
Certain medical conditions may also lead to weight gain. These include:
- polycystic ovary syndrome (PCOS): a condition that causes an imbalance of female reproductive hormones
- Prader-Willi syndrome: a rare condition that an individual is born with which causes excessive hunger
- Cushing syndrome: a condition caused by having an excessive amount of the hormone cortisol in your system
- hypothyroidism (underactive thyroid): a condition in which the thyroid gland doesn’t produce enough of certain important hormones
- osteoarthritis (and other conditions that cause pain that may lead to inactivity)
A complex mix of genetic, environmental, and psychological factors can increase a person’s risk for obesity.
Some people possess genetic factors that make it difficult for them to lose weight.
Environment and community
Your environment at home, at school, and in your community, can all influence how and what you eat and how active you are. Maybe you haven’t learned to cook healthy meals or don’t think you can afford healthier foods. If your neighborhood is unsafe, maybe you haven’t found a good place to play, walk, or run.