Food uncertainty has the effect of invigorating food-related responses. Psychologists have noted that mammals and birds respond more to a conditioned stimulus that unreliably predicts food delivery, and ecologists have shown that animals consume and/or hoard more food and can get fatter when access to that resource is unpredictable. Are these phenomena related? We think they are. Psychologists have proposed several mechanistic interpretations, while ecologists have suggested a functional interpretation: The effect of unpredictability on fat reserves and hoarding behavior is (...) an evolutionary strategy acting against the risk of starvation when food is in short supply. Both perspectives are complementary, and we argue that the psychology of incentive motivational processes can shed some light on the causal mechanisms leading animals to seek and consume more food under uncertainty in the wild. Our theoretical approach is in agreement with neuroscientific data relating to the role of dopamine, a neurotransmitter strongly involved in incentive motivation, and its plausibility has received some explanatory and predictive value with respect to Pavlovian phenomena. Overall, we argue that the occasional and unavoidable absence of food rewards has motivational effects that facilitate foraging effort. We show that this hypothesis is computationally tenable, leading foragers in an unpredictable environment to consume more food items and to have higher long-term energy storage than foragers in a predictable environment. (shrink)

Since overweight and obesity have been framed as one of the main contemporary health challenges in industrialized countries, it has become a matter of public health efforts. While the belief that obese individuals are personally responsible for their body weight prevails in public opinion, evidence-based health science widely acknowledges that obesity is significantly influenced by socio-economic factors and thus that prevention requires structural changes. This constellation bears the chance of politicizing an issue formerly conceived of as private which really is (...) dependent on societal contingencies, such as the particular availability of food. Reflecting on the prevention of obesity from an ethical point of view, therefore, requires an elaborate concept of political responsibility. The core thesis of this paper is that existing approaches within the field of obesity ethics fall short in reasonably grasping the political dimensions at play, due to the prevailing individualistic understanding of responsibility. Drawing upon Iris Marion Young’s concept of political responsibility, I propose an alternative approach that emphasizes the structural determinants of obesity. By arguing this way, obesity prevention comes into view as a public endeavor that involves public discourse as well as shared action. Political responsibility then cannot be discharged merely by intrusive governmental action nor by individuals on their own, but should be considered as a task all of us share. As I will sketch in the last part of the paper, this includes contesting discourses on interpretations of need. Thereby, the paper contributes to recognizing obesity as a social instead of an individual problem. (shrink)

We propose that food-related uncertainty is but one of multiple cues that predicts harsh conditions and may activate “incentive hope.” An evolutionarily adaptive response to these would have been to shift to a behavioral-metabolic phenotype geared toward facing hardship. In modernity, this phenotype may lead to pathologies such as obesity and hoarding. Our perspective suggests a novel therapeutic approach.