Not only can you prevent cancer with diet, you can kill cancer with diet.
I am a prime example and speak from my personal experience, however, I am only in my 4th week.
Hard diet to follow at first: No sugar, grains, alcohol or starchy vegetables. Nothing that turns into sugar(glucose) in your digestive organs. Eat 80℅ alkaline foods 20℅ acid foods, gives your overtaxed pancreas , liver and kidneys a chance to do what they were created for instead of converting abundance of acidic foods to alkaline.
My tumors have started to shrink already!
I also take UNREFINED coconut oil, use coconut milk, full fat, in my morning smoothies with berries and raw, organic pea protein.