Causes of cancer

Obesity, weight and cancer

Overweight and obesity is the second biggest cause of cancer. Find out more about the causes of obesity, the link between obesity and cancer, and how you can keep a healthy weight.

What causes obesity?

Obesity is a complex issue with many causes, but one of the biggest influences is the world we live in.

How does obesity cause cancer?

Body fat is active, telling other cells in the body what to do. The signals sent by fat cells can cause damage and cause cancer to develop.

How can I manage my weight?

Our weight loss tips are based on scientific evidence and can help you create some healthy habits. Keeping a healthy weight cuts your risk of cancer and other serious diseases.

A before and after image of Kath, about her weight loss journey.

Kath's weight loss story

‘I want to encourage other women to live healthily so that fewer women go through what I went through’

Easy read information

We have easy-read information available. This leaflet tells you about some of things you can do to try not to get cancer.

How to try not to get cancer - easy read

Being overweight doesn’t mean that you'll definitely develop cancer. But if you are overweight you are more likely to get cancer than if you are a healthy weight.

Nurse helpline

Questions about cancer? Call freephone 0808 800 40 40 from 9 to 5 - Monday to Friday. Alternatively, you can email us.