Body mass index (BMI) is widely used as a simple and reliable way of finding out whether a person is a healthy weight for their height.


Obesity is where you're very overweight. It can put you at risk of serious health problems.


Adults are generally considered obese if they have a body mass index of 30 or above.


Obesity is usually caused by eating and drinking too much and moving too little.


The main treatment for obesity is a reduced-calorie diet and an exercise plan. Less common treatments include weight loss medicines and surgery.

Page last reviewed: 16/05/2019
Next review due: 16/05/2022