The last band I was in brought in a keyboard player who would often lecture us on the virtues of veganism. I had to laugh because he was so anemic and lethargic. At first I thought it was some other condition until he brought his wife to one of our gigs - she was in the same sad condition!
The fact that they were both potheads didn't help anything.
After a while when he would lecture I would point to him and say, "Good God man, you look like death warmed over! Eat some meat! Have a hamburger, suck on a bullion cube - anything!"