Vegetarian and vegan diets protect against cancer, compared with nonvegetarian diets, according to a new study published by the American Association for Cancer Research. Researchers analyzed 69,120 participants as part of the Adventist Health Study-2 and found that beyond the reduced risk for overall cancer, vegetarian and vegan diets significantly reduced the risk of gastrointestinal cancers (stomach, colon, pancreas, etc.) and female-specific cancers (breast, uterine, ovarian, etc.), respectively.

Tantamango-Barlety Y, Jaceldo-Siegl K, Fan J, Fraser G. Vegetarian diets and the incidence of cancer in a low-risk population. Cancer Epidemiol Biomarkers Prev. 2013;22:286-294.
 

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