Meaning of obesity: increased body weight caused by excessive accumulation of fat
Some information about obesity: Obesity is made possible when the lifetime energy intake exceeds lifetime energy expenditure by more than it does for individuals of "normal weight".
When food energy intake exceeds energy expenditure, fat cells (and to a lesser extent muscle and liver cells) throughout the body take in the energy and store it as fat. The key causes are increased consumption of energy-dense foods high in saturated fats and sugars, and reduced physical activity. Because being obese is more than just being a few pounds overweight, people who are obese have usually been getting more calories than they need for years.
To determine if someone is obese, doctors and other health care professionals often use a measurement called body mass index (BMI). First, a doctor measures a person's height and weight. Then the doctor uses these numbers to calculate another number, the BMI. A person with a BMI above the 95th percentile (meaning the BMI is greater than that of 95% of people of the same age and gender) is generally considered overweight. A person with a BMI between the 85th and 95th percentiles typically is considered at risk of obesity.
Obesity can run in families, but just how much is due to genes is hard to determine.

2. What are the dangers of obesity?
Globally, there are more than 1 billion overweight adults, at least 300 million of them obese.

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