My mother-in-law didn't like meat, because she had been raised on a farm and was forced to eat a lot of it when she was a child, so she wouldn't eat it as an adult. But her non-meat diet wasn't particularly healthy, because she tended to simply substitute a lot of eggs and dairy for herself in place of the meat that she served to her omnivore husband and sons. At least one of her doctors thought that was responsible for her frequent digestive problems and colon cancer.
I try to eat a minimum of red meats for ethical reasons, but I can't imagine becoming a serious vegetarian or vegan. I eat a variety of foods and cuisines, and prefer those that utilize a lot of vegetables and fish, but basically I eat what I like and what is convenient, and try to avoid too much sugar and dairy.