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D espite the fact that one in two people will get cancer, many of us are ill informed about what 💹 we can do to prevent it. How do oncologists live their lives based on what they know? Doctors share the 💹 secrets of living healthily and the risks worth taking – or not.

1. No fumar

"The only safe amount of 💹 smoking is no smoking, given how addictive nicotine is," says oncologist Charles Swanton, who treats patients with lung cancer and 💹 is the chief clinician for Cancer Research UK. Witnessing the pain of lung cancer patients is a potent reminder of 💹 just how devastating the consequences of smoking can be, Swanton says. And, he adds: "Smoking doesn't just cause lung cancer, 💹 but also cardiovascular disease such as heart attacks, stroke and vascular dementia – in addition to 15 other cancer types."

2. Try to maintain a healthy weight

Dr Shivan Sivakumar, an oncologist who treats patients in Birmingham with pancreatic cancers, 💹 bile duct cancers and liver cancers, says that roughly 70% of cases of liver cancer he sees are related to 💹 obesity. "Alcohol does have an impact, but nowhere near the same level," he says. "With cancer, the big cause that 💹 everyone tells you about is smoking. When you look at the statistics at the moment, about 13% of the UK 💹 population are active smokers and that is probably going to go down to less than 10% in the next few 💹 years. When you look at being obese and overweight, one in three of the population in England are overweight, and 💹 a further one in three are obese. So obesity is a much bigger risk factor now."

Joe O'Sullivan, an oncologist and 💹 professor of radiation oncology at Queen's University in Belfast, agrees. The biggest lifestyle factor for prostate cancer is weight, he 💹 says. "Too much fat, too much meat, too many carbohydrates. Anything that gives you a bigger belly – more than 💹 a 34-36in [86-91cm] waistline – increases the risk. The kind of diet that we associate with the western world, lots 💹 of saturated fats and eating more calories than you need."

Mark Saunders, a consultant clinical oncologist at the Christie hospital in 💹 Manchester, says: "There is an increasing number of what we call 'early onset cancers' – cancers in the under-50s. In 💹 colorectal cancer, this is increasing markedly, and I think the big things are lack of exercise, the wrong diet, obesity 💹 and a westernised lifestyle."

3. Reduce your meat intake

Saunders points to the fact that an estimated 13% of 💹 bowel cancer cases are linked to eating too much processed or red meat. The doctors are cautious about their own 💹 consumption: O'Sullivan doesn't eat red meat and Swanton has reduced his intake. Sivakumar says he follows a plant-based diet, although 💹 "mainly for animal cruelty reasons, rather than cancer risk". He says that the reporting of nutritional data about cancer can 💹 be very confusing, and references the work of the statistician David Spiegelhalter from the University of Cambridge, who has shown 💹 that even if everyone ate an extra 50g of bacon every day, that would only increase the incidence of colon 💹 cancer from 6% to 7%. "I think it is about having a healthy, balanced diet," says Sivakumar, "and occasionally having 💹 a sweet treat or a steak."

4. Avoid ultra-processed foods

"Processed food could be a reason that more younger people 💹 are getting cancer," says Sivakumar, "but we haven't really deciphered that. We do know that processed food in general contains 💹 a lot of stuff that normal food products don't. Again, it's all about risk: what does it actually mean for 💹 you? Which I don't think we've really got to the bottom of." Instead, he says, we should have the "mentality 💹 that we need to be eating healthier food" and, he adds, we probably also need to eat a lot less.

" We 💹 very rarely, if ever, buy processed food," says Saunders of his diet. "Most of the time we go to the 💹 grocer to get veg, the local butcher to get meat, and we eat a lot of fish. I do eat 💹 red meat; I occasionally have a Sunday roast. We probably have one or two takeaways a year and it's usually 💹 a disappointment. I eat biscuits at work, but we don't have them in the house. I'm definitely not perfect, but 💹 I do try to control myself so that I reduce my risk of cancer." Not enough fibre is a risk 💹 factor for bowel cancer, for which the classic "five a day" mantra can help. "There is loads of fibre in 💹 fruit and vegetables," says Saunders, adding that you should eat more vegetables than fruit.

5. Drink less alcohol

O'Sullivan has given up alcohol: "I'm 💹 such a saint really," he says. Swanton admits that he has the odd glass of wine, and Saunders drinks occasionally. 💹 Sivakumar says there is evidence that smoking and obesity are far worse risk factors for cancer. "Don't drink to excess," 💹 he says, "but enjoy your life."

6. If you notice anything you are worried about, see a doctor

Professor Pat 💹 Price, a consultant oncologist who helped to launch the Catch Up With Cancer campaign to lobby for better access to 💹 treatment, says: "Go to your GP if you've got a symptom of cancer – coughing up blood, peeing blood or 💹 rectal bleeding, or a pain, or a lump or something like that, things that you know are not right." There 💹 is a full list of signs and symptoms on the NHS website. Try not to be embarrassed. "A lot of 💹 older men in particular in the UK and Ireland are shy about talking about their genitals or their urinary function," 💹 says O'Sullivan. "Hopefully, the younger generations will be much more confident in talking about it."

Saunders says: "The big ones for 💹 colorectal cancers are bleeding and a change in your bowel habit. Go to see your GP – it may well 💹 be nothing if you are young. But if it keeps happening, you have got to go back again and don't 💹 give up if there's a change. It may well not be cancer. It could be something simple like a pile. 💹 But you've got to be aware of your symptoms and do something about it."

7. Keep up to date 💹 with screenings

"I've tried to be good about being up to date with my screenings: cervical, breast and bowel screening – 💹 I absolutely welcome all that," says Price. "Only about 65% of women invited for breast screening in England currently attend. 💹 We've all got busy lives; the last thing we want to think about is our symptoms or a screening test 💹 which might find something. But remember, the chances are that it is going to be absolutely fine. The NHS does 💹 thousands of mammograms every day. There are a very small number that are actually positive (about nine in 1,000 tests). 💹 If they find something, it will probably be tiny and really treatable and curable. In some countries, there are no 💹 screening programmes. We are really lucky to have them, and we should just take the tests when invited."

8. 💹 Get physical

Price discovered a love of running in her 50s: "Getting out there in the fresh air, in the scenery, 💹 with nature is the best thing for you in the world." As you get older: "You are not thinking, 'I've 💹 got to get fitter,' you are thinking, 'I've got to stay healthy.'" Price does an impressive six hours of exercise 💹 a week. "I think it should be more," she says, doing strength and conditioning, dynamic pilates, high-intensity interval training, and 💹 a long run at the weekend. "I find doing the London Marathon gives me a real sense of purpose each 💹 year, because I know what I'm training for. Also, at my age, if you can't be fast, be long. I 💹 think that sense of pushing yourself to the limit is quite a healthy thing to do. Fitness is great for 💹 getting older, and for your bones, muscles and mental health. I'm a real advocate of women of a certain age 💹 getting running."

9. Wear sunscreen

"I avoid going out in the sun," says Price. "I never used to much, but I am 💹 very aware of the risk of skin malignancy. So I cover up and am not a sun worshipper." Swanton says 💹 he always "wears sun cream and, being bald, a sun hat in the sun".

10. Manage stress

"Life is very 💹 stressful and many of us are ill informed about what we can do to prevent cancer. Stress itself hasn't been 💹 proved to cause cancer, but it can mean that you live in a way that increases your risk," says Price. 💹 Stress can sometimes mean that you eat a lot, drink a lot, or don't exercise. Mindfulness is really good, and breathing 💹 techniques. I know they sound a bit minimal, but they can work for many people." Of a direct link between 💹 stress and cancer, Swanton adds: "One of the reasons we don't yet know the answer to this question is that 💹 we lack good models to simulate human stress in the lab, to be able to understand and study it. But 💹 knowing about the emerging evidence on how the central nervous system alters the immune environment and reciprocally, how immune cells 💹 communicate with the central nervous system, it wouldn't surprise me at all if there was a functional link. Over the 💹 next five to 10 years, we may start to see an emergence of data testing the relationship between stress and 💹 cancer."

11. Look into genetic risk

"About 7% of prostate cancers are genetic," says O'Sullivan, "and you may have a 💹 BRCA, a gene mutation that is associated with breast cancer and prostate cancer." These are rare – only 1 in 💹 400 people have them. O'Sullivan says if men have a relative who has died of prostate cancer at a young 💹 age, it is important to have a prostate-specific antigen test, which is available on the NHS, every few years from 💹 the age of 50. "The earlier you catch it, the easier it is to treat," he says. The risk of 💹 a faulty BRCA1 or BRCA2 gene is much higher for breast and ovarian cancers, says Price. "Prophylactic mastectomy is recommended 💹 when the risk gets very high and patients often choose this instead of regular surveillance," she says.

12. When 💹 faced with a diagnosis, knowledge is power

"If you are diagnosed with cancer, we try to advise patients to really sit 💹 with it and come to terms with it," says Price. "Because it's not great – no one wants to be 💹 diagnosed with cancer. But find out as much information as you can. Often the hardest thing is telling other people, 💹 because of their reaction: some people don't want to talk about it, or even don't want to go near you. 💹 Being open and honest can help, and make a plan with your doctors. Often patients find fear of the unknown 💹 is the biggest thing. So if you can ask all the questions and know what you're dealing with, that can 💹 help. There is a huge amount of support out there. People will help you on your journey."

13. Don't 💹 fear treatment

Some people might be worried about getting checked out for fear of treatment, but it is always improving, says 💹 O'Sullivan, particularly radiotherapy. "If people have symptoms, they can sometimes be reluctant to go to their GP because of the 💹 worry of how bad the treatment might be. A lot of people will have relatives who have had a tough 💹 time having radiotherapy treatment. But the science has improved dramatically. If you think about what your smartphone looked like 10 💹 years ago, and what it looks like now, it is similar to the type of technological developments in radiotherapy, to 💹 the point now where the side-effects are much reduced. Many people continue normal life around the treatment. In some radiotherapy, 💹 after five days people can be cured."

14. Talk about it

"Cancer affects one in two people in their lifetime," 💹 says Price. "Everybody knows somebody who has been touched by cancer. Sometimes, we fear it too much and think if 💹 we don't talk about it, it won't happen to us. We need to be much more open about it in 💹 our society." It is important to know, she says: "While cancer can be very bad for some, it doesn't always 💹 equal death. For a lot of people, cancer perhaps means difficult treatment, and as the Princess of Wales has said, 💹 there are good days and bad days. And then maybe you're out of the woods, and that is cancer survivorship. 💹 Then you can start looking at how does that play into making life better. Everyone's cancer journey is different and 💹 can be really tough; for some it works out and for some, sadly, it does not. As cancer doctors we 💹 want there to be as good an outcome as is possible for every patient."

15. Live life to the 💹 full

"My work has had a twofold impact," says Sivakumar. "One impact is seeing liver cancer – there are sensible things 💹 you can do to reduce cancer risk there. But you also have to remember that most cancers are not preventable: 💹 broadly 40% of cancer is preventable and 60% isn't. The other two cancers I see probably aren't in the fully 💹 preventable category. The thing it has really taught me is about work/life balance, spending time with your loved ones and 💹 making sure you have time to see them. I am a very firm believer in that."