One being that feels more pleasure per bite could justify taking all your food

Robert Nozick imagined a 'utility monster' that gets more happiness from any resource than anyone else could. If morality just means maximizing total pleasure, classical utilitarianism would say feed everything to the monster, even at everyone else's expense. Nozick used the thought experiment to argue that pure utilitarianism misses something essential about fairness.

— Robert Nozick, Anarchy, State, and Utopia — 1974, p. 41
Go deeper: get the book →