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There are no proven ways to prevent cancer, but you can reduce your risk of getting it.
According to Cancer Research UK, 4 in 10 cancer cases can be prevented, largely through lifestyle changes. It will help to lower your risk of cancer if you:
Eat a healthy, balanced diet
Stories about various foods and diets linked to preventing cancer are often in the news. This is because a lot of research is going on into diet and cancer. However, it isn’t easy to study the link between diet and cancer, because there are so many different factors involved, and cancer can take years to develop.
No single food or supplement can prevent cancer from developing. Overall, research shows a link between eating certain groups of foods (rather than any specific foods, vitamins or nutrients) and a reduction in cancer risk.
Eating a healthy, balanced diet may lower your risk of developing cancer. Try to consume a diet containing:
Eating a healthy, balanced diet will help your body get all the nutrients it needs.
Fibre and cancer
Evidence consistently suggests that eating plenty of fibre can reduce the risk of bowel cancer. Diets high in fibre can help keep your bowel healthy and prevent constipation.
Fibre-rich foods include wholegrain pasta, bread, breakfast cereals and rice. Pulses, fruit and vegetables are also good sources of fibre.
Red and processed meat
Meat is a good source of protein, vitamins and minerals, such as iron and zinc. However, evidence shows there is probably a link between eating red and processed meat, and the risk of bowel cancer. People who eat a lot of these meats have a higher risk of getting bowel cancer than people who eat small amounts.
Beef, pork and lamb are all red meat. Processed meats include bacon, sausages, salami and ham.
If you eat more than 90 grams of red or processed meat a day (the equivalent of about three thin-cut slices of roast beef, lamb or pork, where each slice is about the size of half a piece of sliced bread), it is recommended that you cut down to 70 grams.
Beta-carotene, often found in antioxidant supplements, has been found to increase the risk of lung cancer developing in smokers and people who have been heavily exposed to asbestos at work. It is possible that taking large amounts of beta-carotene supplements would also increase the risk of cancer in other people.
Maintain a healthy weight
In England, over 60% of the population is overweight or obese. Being overweight or obese can increase your risk of some cancers, such as:
Being a healthy weight can reduce your risk of developing cancer. You can find out whether you are a healthy weight by using the BMI healthy weight calculator.
Stay physically active
There’s evidence that being physically active can reduce your risk of bowel and breast cancer, and also endometrial cancer (cancer of the lining of the uterus). It’s not known exactly how physical activity reduces the risk of these cancers, but research shows that regular exercise helps to keep your hormone levels healthy. Having high levels of some hormones can increase your cancer risk.
Physical activity also helps you to maintain a healthy weight, which in turn reduces the risk of cancer.
Drink less alcohol
Drinking alcohol is known to increase your risk of some cancers, including:
It is probably a cause of other cancers as well, such as colorectal cancer in women and liver cancer.
To reduce the risk of harming your health if you drink most weeks:
Lung cancer is responsible for around a quarter of cancer deaths in the UK, and 90% of lung cancer cases are related to smoking.
"Stopping smoking greatly cuts the risk of developing cancer," says Hazel Nunn, Cancer Research UK's health information officer. "The earlier you stop, the greater the impact. But it's never too late to quit. People who quit smoking at 30 live nearly as long as non-smokers, and those who quit at 50 can still undo half the damage."
Protect your skin from sun damage
Taking care in the sun so that you don't get burned is important for preventing skin cancer.
Keep an eye on any moles or freckles you have. If they change at all (for example, get bigger or begin bleeding), see your GP, as this can be an early sign of cancer. The earlier skin cancer is caught, the easier it is to treat, so see your GP as soon as possible.
We need sunlight on our skin so that our bodies can produce vitamin D, which is essential for healthy bones.
Know your body
It's important to know your body and recognise any potential symptoms of cancer, such as lumps or unexplained bleeding, and to get advice about whether they might be serious.