meta analysis all-cause mortality veg diet

. Further categorization of diets showed
that, in comparison with regular meat eaters, mortality from
ischemic heart disease was 20% lower in occasional meat
eaters, 34% lower in people who ate fish but not meat, 34%
lower in lactoovovegetarians, and 26% lower in vegans.
There were no significant differences between vegetarians and
nonvegetarians in mortality from cerebrovascular disease,
stomach cancer, colorectal cancer, lung cancer, breast cancer,
prostate cancer, or all other causes combined.

http://www.direct-ms.org/sites/default/files/Veg%20vs%20non%20veg%20mortality.pdf