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When the body has become accustomed through long years of dietary habit to a vegetarian menu, the sudden introduction of flesh foods may lead to nitrogenous poisoning. This is because the body can no longer tolerate a foreign protein. And from this we can understand why lifetime vegetarians, and especially lifelong ones like Indian Brahmins, become sick or suffer from nausea when accidentally or unconsciously, they let a piece of meat slip into their food.
-- Notebooks Category 5: The Body > Chapter 3 : Diet > # 19