Do politically irrelevant events influence important policy opinions? Previous research on social welfareattitudes has emphasized the role of political factors such as economic self-interest and ideology. Here, we demonstrate that attitudes to social welfare are also influenced by short-term fluctuations in hunger. Using theories in evolutionary psychology, we predict that hungry individuals will be greedier and take more resources from others while also attempting to induce others to share by signaling cooperative intentions and expressing support for sharing, including evolutionarily novel forms of sharing such as social welfare. We test these predictions using self-reported hunger data as well as comparisons of subjects who participated in relevant online studies before and after eating lunch. Across four studies collected in two different welfare regimes-the United Kingdom and Denmark-we consistently find that hungry individuals act in a greedier manner but describe themselves as more cooperative and express greater support for social welfare.KEY WORDS: social welfare, evolutionary psychology, hunger, public opinion, United Kingdom, Denmark Public opinion is the foundation of representative democracy-it drives electoral behavior and forms the basis for government formation. Politicians react to and anticipate changes in public opinion which has an impact on policy, even between elections. This fundamental position of public opinion has naturally given rise to the normative ideal that these opinions are considered and reasoned. Yet, challenges to this ideal have been continuously leveled from empirical research (e.g., Converse, 1964; Zaller, 1992). Most notably, recent studies suggest that public opinion is influenced by factors that ought to be strictly politically extraneous. For example, incumbents have been shown to gain votes if the local football team wins immediately before the election (Healy, Malhotra, & Mo, 2010), and conservative candidates gain if the polling station is located in a church (Rutchick, 2010). Here, we deepen this literature on extraneous factors in public opinion by predicting and demonstrating that people's political attitudes fluctuate over the course of the