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Tudo isto vem das ideias do filósofo Peter Singer. Peter Singer considera que a discriminação com base na pertença a uma espécie é arbitrária e propõe em vez disso uma definição de cidadão com direitos baseada nas capacidades intelectuais dos diferentes seres.
Com base nestas ideias, Peter Singer considera que não devemos comer carne nem devemos realizar experiências com animais:
He concludes that the use of animals for food is unjustifiable because it creates unnecessary suffering, and considers veganism the most fully justifiable diet. Singer also condemns most vivisection, though he believes a few animal experiments may be acceptable if the benefit (in terms of improved medical treatment, etc.) outweighs the harm done to the animals used. Due to the subjectivity of the term "benefit", controversy exists about this and other utilitarian views. But he is clear enough that humans of comparable sentience should also be candidates for any animal experimentation that passes the benefit test. So a monkey and a human infant would be equally available for the experiment, from a moral point of view, other things being equal. If performing the experiment on the infant isn't justifiable, then Singer believes that the experiment shouldn't happen at all ? instead, the researchers should pursue their goals using computer simulations or other methods.
