A comprehensive new study has found that following a vegetarian diet significantly lowers the risk of developing several types of cancer. Analysing data from over 1.8 million individuals, researchers discovered that vegetarians enjoy a 21% reduced risk for pancreatic cancer, a 12% lower risk for prostate cancer, and a 9% lower risk for breast cancer when compared to their meat-eating counterparts. Additionally, the study indicated a striking 28% and 31% reduction in the risk of kidney cancer and multiple myeloma, respectively.
Groundbreaking Research Findings
Conducted by a team led by Dr Aurora Pérez-Cornago at the University of Oxford, the study’s results were published in the British Journal of Cancer. The research highlights that the cancers examined contribute significantly to mortality rates in the UK, accounting for nearly one-fifth of all cancer-related deaths. Dr Pérez-Cornago expressed optimism regarding these findings, stating, “This study is really good news for those who follow a vegetarian diet because they have a lower risk of five cancer types, some of which are very prevalent in the population.”
Despite these encouraging results, the study noted an alarming trend: vegetarians exhibited almost double the risk of developing squamous cell carcinoma of the oesophagus compared to meat eaters. Researchers speculate that this increased risk could be attributed to potential deficiencies in key nutrients, such as B vitamins, which are often consumed in lower quantities by those on a vegetarian diet.
The Vegan Dilemma
Interestingly, the research also pointed out that vegans have a 40% heightened risk of colon cancer relative to meat consumers. This has been linked to lower average calcium intake among vegans, which stands at 590mg per day, falling short of the UK’s recommended daily intake of 700mg. The authors of the study underline the necessity for further investigation to determine whether it is the absence of meat or specific components of vegetarian diets that contribute to the observed reduction in cancer risk.
Prof Tim Key, an emeritus professor of epidemiology at the University of Oxford and co-investigator of the study, shared his perspective on the findings, suggesting, “My feeling is the difference is more likely to be due to the meat itself, but that’s an opinion that we haven’t looked at directly.”
Methodology and Scope of the Study
The research drew upon a wealth of data collected from various global studies on diet and health, allowing the team to examine a diverse population. Participants included 1.64 million meat eaters, 57,016 poultry consumers, 42,910 pescatarians, 63,147 vegetarians, and 8,849 vegans, all followed for an average of 16 years. The study controlled for various factors that could influence cancer risk, including body mass index and smoking habits.
Despite the broad scope, researchers found no significant evidence that vegetarians have a lower risk of bowel cancer compared to meat eaters. This could be due to the relatively low consumption of red and processed meats among participants. Prof Key noted, “It could be that if we had had more people with very high intakes of meat in the meat-eating group, the results could have been different.”
Pescatarians and poultry eaters also exhibited lower risks for specific cancers, including breast and kidney cancers. This nuanced understanding of dietary impacts on cancer risk underscores the complexity of nutritional science.
The Evolving Dietary Landscape
As the participants in this study were primarily recruited in the 1990s and 2000s, it’s important to acknowledge that dietary trends have shifted significantly since then. The rise in ultra-processed food consumption and the introduction of fortified vegan products, such as calcium-enriched oat milk, may have altered the nutritional landscape. Prof Jules Griffin, director of the Rowett Institute at the University of Aberdeen, remarked on the need for future studies to compare these diets against the NHS Eatwell guidelines, which advocate for a balanced diet that includes moderate amounts of meat and fish, potentially providing essential nutrients while minimising cancer risk.
Why it Matters
This study adds substantial weight to the argument for adopting a vegetarian diet, particularly in the context of cancer prevention. With a significant portion of cancer deaths attributed to the types examined, these findings could have profound implications for public health strategies and individual dietary choices. As more individuals seek to understand the impact of their diets on long-term health, this research serves as a crucial reminder of the benefits of plant-based eating while also highlighting the need for balanced nutrition to mitigate potential risks.
