About a month ago, I decided to make a radical change to my diet and go vegan, essentially overnight. My motivations for going down this road are a little odd, but have nothing to do with health or ethical reasons- the simplest explanation might be to say that I'm not vegan because animal products are bad, but because vegetable products are awesome and tasty. Yes, animal products are also awesome and tasty, but like I said, the actual reasons are kinda odd.
Since turning vegan, I've noticed changes with my body. Some expected (I've lost weight and can almost guarantee my blood pressure and cholesterol have improved) and some unexpected (food tastes different, I find my stomach's shrunk but I get hungrier more often, etc.), and I'd like to learn more about how this kind of diet affects one's body, anecdotal or otherwise.
Being of the non-hippie sort, I'm keenly interested to find out if there's any scientific literature on this topic (diet affecting body chemistry, etc.), but I'd be happy to hear personal experiences, too. Suffice it to say, though, that as a life-long omnivore, there was no-one more surprised than me to find out that what you eat really (it seems) does make a noticeable difference in day-to-day life.