Have you ever heard of the China Study
[link to Amazon.com]? I just skimmed through the book today, and you seem to follow the diet that's explained in the book quite closely, which is very positive
I recommend you read the book, it's very enlightening and pretty scary at the same time.
I would try to make the switch, but I'm still a young boy living at his parents place
However, I have been thinking about changing my lunch to simple brown bread and a salad mix to start out