saved his life!
I spent the week in Amherst, MA at a workshop for professional illustrators. My work station was right next to artist/ bodybuilder Julie Bell and right behind her husband, Boris Vallejo. Julie has been a Vegetarian for most of her 50 years and still looks pretty much like this:

Her husband, Boris, is 67. 12 years ago his cholesterol levels were 265 mg/dl and his liver function was declining. His wife convinced him to go on a "clean" vegetarian diet and he adapted to it very quickly. Within a year his liver was healthy and functioning normally, while his cholesterol levels are now on the low side! He's fit and energetic; in fact, he easily kept up with the rest of us last week during our grueling 9am-midnight schedules. He did tell me that he believes that medication is sometimes necessary for some medical conditions, though he believes that dietary changes are often the least risky and most beneficial first action to take. Now, if I could only get my 67 year old, 450 pound sedentary all-meat-and-dairy diet father to adopt the same philosophy!
