<Li> "Pollo - pescetarian", which includes poultry and fish, or "white meat" only; </Li> <Li> Pollotarianism, which includes chicken and possibly other poultry; </Li> <P> Semi-vegetarianism is contested by vegetarian groups, such as the Vegetarian Society, which states that vegetarianism excludes all animal flesh . </P> <P> Studies on the health effects of vegetarian diets observe heterogeneous effects on mortality . One review found a decreased overall risk of all cause mortality, cancer (except breast) and cardiovascular disease; however, a meta - analysis found lower risk for ischemic heart disease and cancer but no effect on overall mortality or cerebrovascular disease . Possible limitations include varying definitions used of vegetarianism, and the observation of increased risk of lung cancer mortality in those on a vegetarian diet for less than five years . An analysis pooling two large studies found vegetarians in the UK have similar all cause mortality as meat eaters . An older meta analysis found similar results, only finding decreased mortality in vegetarians, pescatarians, and irregular meat eaters in ischemic heart disease, but not from any other cause . </P>

How old do you have to be to be a vegetarian