A Colorectal Dietitian's Daily Diet Choices to Lower Colon Cancer Risk

Sophie Medlin, a London-based colorectal dietitian with two decades of clinical experience, has quietly restructured her own diet around the same principles she prescribes to patients — and her choices are shaped directly by what the research says about rising colon cancer rates. Cases of colorectal cancer in adults under 50 have been climbing since the mid-1990s, and it is now the deadliest cancer form for that age group. While the exact cause of the trend remains unclear, lifestyle factors — particularly diet — are among the most actionable levers available.

The single biggest thing Medlin has cut is processed meat. That means essentially eliminating hot dogs, deli meats, and trendy high-protein snacks like beef jerky, which she says are gaining an undeserved health halo thanks to the protein-obsessed food culture. The World Cancer Research Fund recommends capping unprocessed red meat at 350–500 grams per week (roughly three portions); Medlin keeps herself to a maximum of two servings weekly and draws a hard line at processed varieties, which carry a stronger link to colorectal cancer.

On the addition side, Medlin prioritizes plant diversity at every meal. The mechanism is well-established: fiber from plants feeds beneficial gut bacteria, which ferment that fiber and produce short-chain fatty acids — postbiotics that actively help protect the colon lining from cancerous changes. Her practical tip for patients is deceptively simple: when cooking dinner, chop one extra vegetable and throw it in the pan. The time cost is negligible; the microbiome benefit compounds over time.

Fermented foods round out her daily routine. Medlin eats something fermented — yogurt, kimchi, pickled cabbage — with most meals, treating these items less as health supplements and more as everyday condiments. She often makes tzatziki from Greek yogurt, cucumber, olive oil, and herbs as a go-to dipping sauce. The logic is that fermented foods introduce live beneficial microbes to the gut, reinforcing the microbial ecosystem that plays a central role in chronic disease prevention. Medlin is candid that her diet isn't perfect — she and her chef husband still eat out and order takeout — but the consistent daily habits around plants and fermented foods are non-negotiable.