Seventh-Day Adventists have a lower cancer risk and a longer life expectancy than the general US population. In the ''Adventist Health Study 2" they compared meat-eating adventists to vegetarian and vegan adventists from 2001 and 2007. In total they enrolled 96,000 Adventists of age 30 to 112, from all 50 U.S. states and Canada, making this the largest study on the topic (to my knowledge).