I've been getting quite a lot of email about our success on this plant based diet. I suggest that if you are truly interested in changing your health you read the book "The China Study". It will answer your questions. Another great book is "Eat to Live" (but the recipes in the older book aren't so good).
Also, I've added something new to my sidebar. It is a list of my selected posts, starting from the beginning, that have good information about this diet works (don't care for the word "diet" but that is what it is). If you are thinking about making big changes some of those posts might be interesting. Of course, I think every post on this site is amazing and you should read them all while you eat a green smoothie and some freshly picked apples.