Obesity often results from taking in more calories than are burned by exercise and normal daily activities.
Obesity occurs when a person's body mass index is 30 or greater. The main symptom is excessive body fat, which increases the risk of serious health problems.
The mainstay of treatment is lifestyle changes such as diet and exercise.
Consult a doctor for medical advice
Sources: Mayo Clinic and others.
More than 3 million US cases per year
Lab tests or imaging not required
Chronic: can last for years or be lifelong