Adding to previous comments, Joel Mabus' song is a wonderful broadside against those vegetarians who are rather sanctimonious about the concept and is titled "Hitler Was a Vegetarian".

Adam McNaughtan has written a couple of songs "Cholesterol" to the tune of Lilly Marlene "Cholesterol, Cholesterol, my chance of survival is small, But I'll no' get a dose o' Anorexia Nervosa 'cos I love my cholesterol"

and his song "Erchie Cathcairt" about a health nut in Glasgow who tunes his body to the peak of perfect fitness only to get run over by a bus.

But I suppose you were looking for something serious and boring about health.