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tigers, lions and all meat eating animals, has a short intestines.. meat must be digested fast and expel fast.. so shorter types intestines are required for digesting meat.. so all meat eating animals has a shorter intestines.. but a human beings intestines are longer, so meat is not suitable for longer types intestines... vegetarian diet is suitable for longer types intestines,, because no harm will come when digesting vegetables are moving in a longer intestines.. meat is not suitable to be kept in a longer intestines for longer time, slowly in a long run it can harm the general health.. this is only my oppinion it can be right or wrong.. thanks