"The more stressed you are, the more likely you are to prefer heavier women."
A study appearing in PloS One asked 41 men to engage in a stress-inducing task, while their 40 counterparts in the control group weren't exposed to any stressors. Both groups then rated the attractiveness of various female bodies across the size and weight spectrum. The men in both groups were matched for age, BMI and appetite, but after the task, the stressed group rated a much heavier body size as the most attractive, rated heavier women as more attractive overall and preferred a wider range of figures in total. Previous research has implied that there is an evolutionary motivation for this response (that is, when resources are unavailable, people get less sexually choosy, even on an instinctive level).