It is a condition characterized by an excessive accumulation of body fat. It has many negative impacts on health. If a person’s bodyweight is 20% higher than it should be, he/she is considered to obese.
There are many ways in which a person’s health in relation to their weight can be classified, but the most widely used method is body mass index (BMI).
BMI is a measure of whether you’re a healthy weight for your height. You can use the BMI healthy weight calculator to work out your score.
For most adults, a BMI of:
- 18.5 to 24.9 means you’re a healthy weight
- 25 to 29.9 means you’re overweight
- 30 to 39.9 means you’re obese
- 40 or above means you’re severely obese
BMI isn’t used to definitively diagnose obesity because people who are very muscular sometimes have a high BMI without excess fat.
But for most people, BMI is a useful indication of whether they’re a healthy weight, overweight or obese.
A better measure of excess fat is waist circumference, which can be used as an additional measure in people who are overweight (with a BMI of 25 to 29.9) or moderately obese (with a BMI of 30 to 34.9).
Generally, men with a waist circumference of 94cm (37in) or more and women with a waist circumference of 80cm (about 31.5in) or more are more likely to develop obesity-related health problems. (Source: NHS-UK)