Obesity is a term used to describe somebody who is very overweight with a high degree of body fat.
There are a number of ways a person's weight can be assessed. The most widely used method is body mass index.
Being obese increases your risk of developing a number of serious and potentially life-threatening diseases, such as:
- type 2 diabetes
- heart disease
- some types of cancer, such as breast cancer and colon cancer
In addition, obesity can damage your quality of life and can often trigger depression.
Source: NHS choices