Jeff Beck the great rock guitarist was a strict vegetarian. Reasons for his no-meat diet to the side, there are nutritional scientists who believe that meat has vital amino acids which no combination of vegetable protein can provide. 

New amino acids (the building blocks of protein) are being discovered all the time - even though there are still only 16 of the main ones. When someone who is wealthy, healthy and who does not drink a lot of alcohol or ever used hard drugs (the most he admitted to doing was smoking weed occasionally) dies from meningitis while 85% of those who contract it do not, it makes you wonder. 

I doubt his family will ever allow much inquiry or study of the matter, but it makes you wonder if his fairly unusual diet (vegetarians are still a fairly small percentage of the population in first tier economies) had something to do with his inability to survive.* 

I've tired being a vegetarian for several months. I eventually stopped because my health suffered terribly. So it made me wonder if there might also be long-term problems that might be caused by eliminating all meat from one's diet. 

I'm just sayin'. 

* In the case of meningitis, I have read that people who manage to survive a bad case still generally have serious, permanent side-effects (since it attacks/kills brain and spinal tissue which may not regenerate). So, in one sense maybe Beck was spared a life of misery from long-term severe disability by dying. It would have been terrible if he was left too disabled to ever play guitar again or work on/race hot rods as he loved so much. 

NOTE: Ironically, I watched an interview Mr. Beck recently did with a hot-rod hobbyist show (Car Crazy) and during the interview, he happened to say, " ...I caught the disease (of hot rods) early in life. The uncurable disease."