An old school friend of mine has just died from Bowel Cancer. This article in the Huffington Post gives you all the information you need about changing your diet.
As for being embarrassed about seeing your doctor, it certainly won’t be a big deal for him or her. They have seen it all before. What they would not enjoy is sending you off to the hospital when they see clear symptoms of the desease and it’s probably too late!
I’m astonished at how few people eat breakfast. By that I mean breakfast cereal before you leave the house (who cares what time of the morning it is). A high fibre cereal helps your digestion and gets your metabolism started. Oh, and I believe there are vegetarians who eat no vegetables. Funny (peculiar) old world.