Abstract While antispeciesism is an ethical notion, veganism is behavioral. In this paper, we examine the links between the two. Building on Blackorby and Donaldson (Econ J 102:1345–1369, 1992), we consider a two-species model in which humans consume animals. The level of antispeciesism is conceived as the weight on animals’ welfare in the utilitarian social welfare function. We show that more antispeciesism increases meat consumption if and only if animals’ utility is positive.