My best friend has been a vegetarian for the last 30 years, ever since he suffered a heart attack on stage (he's a guitarist) at age 30.
His wife turned vegetarian out of support, and their daughter was raised as a vegetarian. All three of them are some of the happiest, healthiest people I know. Mike will routinely run five or six miles a day, and his wife joins him occasionally. My buddy has so much energy I often refer to him as an amphetamine with feet.
I've had dinner at their home countless times, and it's always vegetarian, and it's always exceptionally good...
Both vegetarians I went to school with look pale, tired and sickly.