Greatest health benefit youve noticed from change to vegetarian diet?

Hey there. Wondering what health changes folks have noticed in going to a vegetarian diet. Im not a vegetarian yet but I want to move in that direction. A friend who is vegan cites benefits that he says happen w veganism but I dont think I will ever give up dairy. Wondering to what degree a vegetarian (non-vegan) might expect the same.) thanks for your thoughts?