The news that vegetarians have a 40% higher incidence of colon cancer swept through newsfeeds. We examined the primary source—the EPIC-Oxford study—and uncovered why this figure shouldn’t cause alarm. Dr. Mikhail Koryakin, Doctor of Medical Sciences and Professor, shared his insights with aif.ru:
— At first glance, one might assume that abstaining from meat directly causes bowel cancer. However, it’s crucial to clarify a few points. Firstly, the design of the study (EPIC-Oxford) must be considered. The researchers compared groups with different dietary patterns, but vegans and vegetarians represent more than just individuals who cut out meat; they form a group with a generally distinct lifestyle. Statistics show they often live longer due to a lower risk of cardiovascular diseases, diabetes, and certain cancers. Nevertheless, colon cancer is a disease whose risk escalates significantly with age. Because vegetarians are less likely to die from heart attacks at age 60, they are more likely to reach 80 or 90, the age brackets where cancer risks peak. Consequently, in absolute terms, more cases of colorectal cancer might be recorded in the older vegetarian cohort, even if the risk of developing the disease at any specific age might be lower.
The statement that “risk increases by 40%” sounds alarming, but in medical statistics, distinguishing between relative and absolute risk is vital. If the absolute risk of colon cancer among meat-eaters is, for instance, 2 cases per 100 people, a 40% rise in relative risk means the incidence among vegetarians would be 2.8 cases per 100 people. The absolute difference is merely +0.8 cases. In essence, the risk climbs not from 0% to 40%, but from 2% to 2.8%. While this is significant for scientific analysis, it doesn’t imply that every second vegan will develop cancer, the doctor explained.
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It is also important that this is an observational study: it notes an association but does not prove direct causation. Scientists hypothesize that the issue may not stem from the absence of meat itself, but from what it is replaced with. Vegans often consume a large amount of highly processed foods (meat substitutes, soy-based convenience foods, refined carbohydrates), which can contain carcinogens (like acrylamide) or trigger inflammation. Nutritional deficiencies cannot be discounted either: abandoning meat necessitates meticulous dietary planning. Potential shortages of Vitamin D, calcium, iron, and especially B12 can impact gut health and immunity. Furthermore, the vegetarian group might include individuals who adopted this diet due to pre-existing gastrointestinal issues, which also skews the statistics, the expert clarified.
The study fairly points out that vegetarians have a lower incidence of many other cancer types (pancreatic, breast, etc.). This risk reduction frequently outweighs the potential increase in colon cancer risk. Moreover, vegetarians demonstrate a substantially lower risk of heart attacks and strokes—the leading causes of death globally.
Thus, this research does not claim that meat protects against cancer or that eliminating it is perilous. It simply serves as a reminder that veganism and vegetarianism are not fail-safe protections against all ailments and demand a thoughtful approach to nutrition. When opting out of meat, it remains essential to monitor B12 and iron levels, avoid overindulging in ultra-processed snacks, and undergo appropriate screening procedures (fecal occult blood tests or colonoscopies) upon reaching the recommended age, concluded Koryakin.
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