Three of the founder members became vegetarian at some point, see their individual pages.

photo right from 1987

• Bob Wier - (left in the photo) seems to have been vegetarian the longest, but unclear
  
  
• Phil Lesh - (2nd right in photo) vegetarian from about 1991
  
  
• Jerry Garcia - (2nd left in photo) vegetarian from about 1993 until his death in 1995