A consultant colorectal surgeon at Imperial College London has issued a stark warning to gym-goers who frequently consume protein powders, cautioning that these supplements could harm gut health and increase the risk of bowel cancer. Dr. James Kinross, a microbiome expert with two decades of experience, highlighted concerns about the rising rates of colorectal cancer worldwide, noting that the World Health Organization predicts 3.2 million new cases annually by 2040.
While protein is essential for muscle building, Dr. Kinross criticized the growing obsession—particularly among men—with consuming large amounts of protein through powders and supplements. He explained that when the body metabolizes protein, it produces toxins that can cause inflammation in the gut, a key factor linked to the development of bowel cancer. He also pointed out that high-protein powders, including creatine supplements, can significantly alter the gut microbiome, disrupting the balance of beneficial and harmful bacteria.
The surgeon warned against over-processed foods laden with additives and preservatives, such as instant noodles and sugary snacks, which may further increase cancer risk by promoting inflammation and damaging gut bacteria. Instead, he recommended prioritizing plant-based proteins over animal-derived ones and advised avoiding powdered fiber supplements and similar nutrition products, which he described as harmful to gut health.
Dr. Kinross also addressed the role of red meat in bowel cancer risk. While acknowledging that red meat is a rich protein source, he advised limiting its consumption to once a week and treating it as an occasional indulgence rather than a dietary staple. He explained that certain amino acids in red meat break down into harmful metabolites in the liver, which may contribute to cancer development. To reduce risk, he suggested replacing red meat with white fish or chicken, emphasizing that it is not necessary to adopt a fully vegan diet to maintain a healthy gut.
The surgeon identified three main factors influencing colorectal cancer risk: genetics, environment, and gut microbes. He noted that inherited genetic risk accounts for only a small percentage of cases. Environmental factors include diet, exposure to toxins, and contact with microplastics. Ultra-processed foods, he said, are widely consumed due to their affordability but are aggressively marketed to young people, exacerbating health risks.
Dr. Kinross stressed that maintaining a healthy balance of gut bacteria is crucial, not only by reducing harmful microbes but also by supporting the growth of beneficial ones. He underscored the importance of early detection in preventing bowel cancer, urging people to seek medical advice if they notice symptoms such as bleeding or changes in bowel habits. He encouraged individuals to be proactive in requesting appropriate screening tests, highlighting colonoscopy as the gold standard, though simpler stool tests can also provide valuable insights.
With bowel cancer rates rising globally, Dr. Kinross’s message is clear: careful attention to diet, limiting certain protein sources, and regular screening are vital steps to protect gut health and reduce the risk of this preventable disease.
Related Topics:
Weight Loss Drugs Transform Dads’ Bodies and Bonds
