We are often told that being overweight increases our risk of cancer. In fact, in the UK, obesity is the biggest preventable cause of cancer after smoking, according to Cancer Research UK. But why does being overweight increase a person’s likelihood of developing cancer? A group of scientists say they now know. The team from Trinity College Dublin say the reason overweight people are at greater risk of developing cancer is because a certain cell in the body that’s used to destroy cancer gets clogged with fat and stops working as a result. Publishing their findings in the Nature Immunology journal, the team said they were able to show that the body’s natural cancer-fighting cells get clogged by fat. They are hopeful that new drug treatments can be developed that will reverse the effects and restore the cancer-killing ability of said cells. Until then, though, the best advice remains to stay a healthy weight, stop smoking and cut down on alcohol. Speaking about the findings of the research, Dr Leo Carlin, from the Cancer Research UK Beatson Institute, said: “Although we know that obesity increases the risk of 13 different types of cancer, we still don't fully understand the mechanisms underlying the link. “This study reveals how fat molecules prevent immune cells from properly positioning their tumour-killing machinery, and provides new avenues to investigate treatments.” [Related reading: Major study finds eating processed meat raises risk of breast cancer]
Women who are larks, otherwise known as “morning people”, have a lower risk of developing breast cancer, a study has revealed. While the exact reason why remains unknown, the team of researchers from the University of Bristol in the UK say their findings are important and add to the growing understanding of how sleep affects our health. A person’s body clock (also known as their circadian rhythm) regulates when a person feels sleepy or awake over a 24-hour period. So-called morning people wake up earlier, peak earlier in the day and feel sleepy earlier in the evening. In contrast, “evening people” (night owls) get up later, peak later in the day and go to sleep later in the evening. Using a data analysis technique called Mendelian randomisation, the researchers looked at DNA snippets of more than 400,000 women. They discovered that women who were larks were less likely to have breast cancer than their night owl peers. Speaking about the findings of the research, Dr Rebecca Richmond, a researcher from the University of Bristol, told the BBC: “The findings are potentially very important because sleep is ubiquitous and easily modified. “Previous research has looked at the impact of shift work, but this is showing there may be a risk factor for all women.” Nevertheless, many questions still remain. For example, more research now needs to be conducted to see whether the body clock itself is directly impacting a person’s risk of developing cancer, or if factors like night owls breaking their natural circadian rhythm to accommodate jobs is having an impact. [Related reading: Major study finds eating processed meat raises risk of breast cancer]
By 2043, obesity will surpass smoking to be the biggest preventable cause of cancer in UK women. That’s one of the shocking new predictions to come out of a report by Cancer Research UK. At present, around 7% of cancers in women are linked to being overweight and obese, while 12% are said to be caused by smoking. But as the number of individuals who smoke continues to fall and obesity rates continue to rise, the UK cancer charity believes that gap will completely disappear over the next 25 years (assuming current trends continue). In fact, by 2035, the percentage of cancers caused by smoking and by carrying excess weight will almost be equal (25,000 cancer cases each year related to smoking vs. 23,000 related to being overweight). However, after just another eight years (by 2043), being overweight and obese is likely to be linked to even more cases of cancer in women than smoking. Interestingly, the cancer charity says that obesity will not overtake smoking as the leading cause of cancer in men until some time later. The reason for this, though, is simply because more men than women smoke. While obesity is more prevalent among men too, it is thought to be a greater catalyst in women for developing cancer. Professor Linda Bauld, Cancer Research UK's prevention expert, said the UK government must act now to stem the tide of obesity-related cancers. “That's why we are raising awareness of the link between cancer and obesity and calling for measures to protect children, like a ban on junk food adverts before 9pm and for restrictions on price promotions of 'less healthy' products,” she said. Smoking-related cancers include: acute myeloid leukaemia lung bladder bowel cervical pancreatic stomach Obesity-related cancers include: bowel gall bladder kidney liver breast ovarian thyroid
A new study has revealed that many people in England are unsure about cancer risk factors and often incorrectly identify fake cancer causes. The survey of 1,330 people found that drinking from plastic bottles and using microwave ovens are two of the fake cancer causes people often cite. The good news is that 88% of people surveyed correctly identified smoking as a major cancer risk factor, while 80% picked passive smoking and 60% said sunburn were also causes of cancer - all of which have been proven. According to Cancer Research UK, smoking, overexposure to UV radiation and being overweight are the biggest preventable causes of cancer. In fact, the charity says that about four in 10 cases of cancer could be prevented with lifestyle changes and people need the right information to help them "separate the wheat from the chaff". Researchers from University College London and the University of Leeds conducted the survey and discovered that more than 40% of participants wrongly thought that stress and food additives caused cancer. Dr Samuel Smith from the University of Leeds said: "It's worrying to see so many people endorse risk factors for which there is no convincing evidence. "Compared to past research, it appears the number of people believing in unproven causes of cancer has increased since the start of the century, which could be a result of changes to how we access news and information through the internet and social media." Clare Hyde, from Cancer Research UK, said: "There is no guarantee against getting cancer - but by knowing the biggest risk factors we can stack the odds in our favour to help reduce our individual risk of the disease, rather than wasting time worrying about fake news."
By the time they reach middle age, seven in 10 UK millennials (people born between the early 1980s and mid-90s) will be too fat, health experts say. In fact, millennials are on course to be the fattest generation ever since records began. In comparison, only about half of the so-called “baby boomer” generation (those born just after the Second World War) were fat at middle age. It’s a worrying revelation, especially as being fat as an adult is linked to an increased risk of developing 13 different types of cancer, according to Cancer Research UK who conducted the research. The charity said only 15% of the UK population are aware that being fat puts them at increased risk of breast, bowel and kidney cancer. Even more sobering is the fact Britain is now the most obese country in Western Europe and its obesity rates are rising faster than any other developed nation. In 1993, obesity prevalence was 15%, but that figure had almost doubled risen to 27% in 2015. Professor Linda Bauld from Cancer Research UK said: "Extra body fat doesn't just sit there; it sends messages around the body that can cause damage to cells. "This damage can build up over time and increase the risk of cancer in the same way that damage from smoking causes cancer.”
A new large-scale study has found that using aspirin long-term could slash the chances of developing gastrointestinal cancer. Of all the gastrointestinal cancers, which include pancreatic cancer, liver cancer, oesophageal cancer, stomach (or gastric) cancer and small intestine cancer, colorectal cancer is the most common in the western world. While there are a number of lifestyle changes people can make to reduce their risk of developing cancer, including avoiding tobacco, limiting their alcohol consumption, eating healthier and exercising more, an increasing number of studies suggest the use of aspiring could also help. For this latest study, Prof. Kelvin Tsoi, of the Chinese University of Hong Kong, and his team set out to investigate the effect of aspirin use on gastrointestinal cancers. Over a 10-year period, the team of scientists examined over 600,000 participants and analysed how aspirin use affected their chances of developing gastrointestinal cancer. They found that aspirin users were 47% less likely to have liver and oesophageal cancer, 38% less likely to have stomach cancer, 34% less likely to have pancreatic cancer and 24% less likely to have colorectal cancer. In addition, aspirin use also significantly reduced the risk of leukaemia, lung cancer and prostate cancer.
Men with waists over 40 inches and women with waists over 35 inches are at greater risk of certain cancers, as well as type 2 diabetes. That’s the message to come out of a study by scientists at the International Agency for Research on Cancer (IARC), which is an arm of the World Health Organisation. According to Dr Heinz Freisling, the lead author of the study published in the British Journal of Cancer, a person’s waist measurement is as good at predicting cancer risk as their body mass index (BMI). His advice is for people to know their waistlines. “You only need to put a tape measure around your belly button. This is easy to do and can give a person an indication of whether their risk for specific cancers is increased or not – for instance pancreas or liver cancer which are known to be related to increased body fatness or obesity,” he said. Being overweight or obese is the single biggest preventable cause of cancer after smoking and is linked to 13 types of cancer, including bowel, breast and pancreas. The study combined data from about 43,000 participants who had been followed for an average of 12 years and more than 1,600 people were diagnosed with an obesity-related cancer.