Avoidances of foods of animal origin have different origins and histories, but many have strong sociocultural links, especially religious ones. In one case, there are biological results as well, with ethnic differences in prevalence of lactose malabsorption apparently deriving from contrasts in long-term patterns of milk use and avoidance.
No takes yet. Share an insight, caveat, or question.
Frederick J. Simoons (1978) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: