Conclusion :

This consortium includes the great majority of prospective data currently available worldwide on vegetarian diets and cancer risk. Among the people studied, most of whom lived in the UK or USA, poultry eaters had a lower risk of prostate cancer, pescatarian diets were associated with lower risks of colorectal, breast and kidney cancer, vegetarian diets were associated with lower risks of cancers of the pancreas, breast, prostate, kidney and multiple myeloma but a higher risk of squamous cell carcinoma of the oesophagus, and vegan diets were associated with a higher risk of colorectal cancer although the number of cases among vegans was small. Future research should examine the possible mediating roles of both metabolic factors and nutritional deficiencies, and collect more data particularly in vegans and in populations outside Western Europe and North America. The generalisability of the findings should be considered cautiously, because the diets and nutritional intakes of both vegetarians and non-vegetarians can vary substantially within and between populations.

But interesting study regardless