Colon cancer prevention if dont eat processed meat, how many days a week to eat meat is recommended ?

Sorry, but no known amount of meat (processed or otherwise) is known to reduce or elevate the risk -- only that heavy meat eaters have higher colon cancer rates than vegetarians and people who eat less red meat. Anyway, even in the heaviest processed meat eaters, the proportion who get cancer is low. Periodic colonoscopy (usually every 5 years at your age) is far more important for prevention.

Agree with Dr. H. You can reduce your risk of cancer by adopting healthy habits: Eat a mostly vegetarian diet, avoid alcohol, tobacco and street drugs, avoid excessive exposure to sun, maintain healthy weight, get HPV vaccine, exercise 30 minutes each day, drink enough water so your urine is mostly colorless. Wish you good health!