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no they are not known at all! No study has shown a link between eating meat and cancer, as the 5 meta studies showed!
There IS a longer life expectancy for Vegetarians, due to lower risk of heart attack and lower prevalance of smoking.
The cancer rate of non-smoking vegetarians = the cancer rate of non-smoking meat eaters
AND
The cancer rate of smoking vegetarians = the cancer rate of smoking meat eaters
As has been proven by numerous studies of the population.
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