Objective Long-term psychological stress is associated with BMI increases in children as they transition to adulthood, while long-term maintenance of physical activity can slow excess weight gain. We hypothesized that in addition to these main effects, long-term physical activity mitigates the relationship between long-term stress and BMI increase. Methods The NHLBI Growth and Health Study enrolled 2,379 10-year-old Black and White girls, following them annually for 10 measurement points. Growth curve modeling captured the dynamics of BMI, measured yearly, and stress and physical activity, measured every other year. Results At average levels of activity and stress, with all covariates remaining fixed, average BMI at baseline was 19.74 (SE = 0.38) and increased 0.64 BMI (SE= 0.01, p < .001) units every year. However, this increase in BMI significantly varied as a function of cumulative stress and physical activity. Slower BMI gain occurred in those girls who were less stressed and more active (0.62 BMI units/year, SE= .02, p < .001), whereas the most rapid and largest growth occurred in girls who were the more stressed and less active (0.92 BMI units/year, SE= .02, p < .001). Racial identification did not alter these effects. Conclusions As hypothesized, in girls who maintained long-term activity, BMI growth was mitigated, even when reporting high long-term stress, compared to less physically active girls. This study adds to a converging literature in which physical activity, a modifiable prevention target, functions to potentially limit the damaging health effects of long-term psychological stress.

It is unclear if, and to what extent, the human memory system is biased towards food and food relevant stimuli. Drawing upon existing demonstrations of attentional biases to high calorie food images, and findings that evolutionarily relevant stimuli are preferentially remembered, we hypothesized that images of high calorie foods would be better remembered than images of low calorie foods and nonfood items. Investigating this is important because a general bias towards remembering high calorie images might facilitate greater incentive learning towards these images which could result in cue-induced overconsumption. We tested this in two pre-registered, within-subject studies (ns = 38). In Experiment 1, using a rapid stream visual presentation procedure and recognition memory test, we found no effect of image type (high calorie, low calorie, nonfood) on recognition for previously seen images (F &lt; 1.0). However, we did observe fewer correct rejections (i.e. more false memories) for novel low calorie images. In Experiment 2, we used a longer encoding procedure and free recall memory test and similarly failed to observe an effect of image type on recall (F &lt; 1.0). We did discover several other factors that correlate with image memory which we discuss along with the implications of these results and directions for future research.

Traditionally, handshaking has conferred benefits for businesspeople—signaling politeness, establishing an intention to cooperate, and promoting deal-making. How might the psychological meaning of handshaking have shifted due to the COVID-19 pandemic, which led handshaking to become touted as an imminent threat to public health? Through a highly powered, preregistered study (N = 595), we compared U.S. adults’ perceptions of a businessperson who shakes hands vs. refrains from shaking hands during the era of COVID-19. Participants judged handshakers more negatively than non-handshakers, in terms of both global attitude toward them (d = 2.21) and approval of their job performance (d = 2.66). Mediation analyses suggest that businesspeople were judged negatively for shaking hands principally because doing so made them seem less competent and less moral. Judgments of handshaking were more negative among liberals than conservatives and among women than men. To maximize others’ perceptions of them, it would behoove businesspeople to refrain from shaking hands for the foreseeable future. The months and years ahead may be an unprecedented time to rediscover the psychology of handshaking and its role in the workplace.

Vaccinating the public against COVID-19 is critical for pandemic recovery, yet a large proportion of people remain unwilling to get vaccinated. Beyond known factors like perceived vaccine safety or COVID-19 risk, an overlooked sentiment contributing to vaccine hesitancy may rest in moral cognition. Specifically, we theorize that a factor fueling hesitancy is perceived moral reproach: the feeling, among unvaccinated people, that vaccinated people are judging them as immoral. Through a highly powered, preregistered study of unvaccinated U.S. adults (total N = 846), we found that greater perceived moral reproach independently predicted stronger refusal to get vaccinated against COVID-19, over and above other relevant variables. Of 22 predictors tested, perceived moral reproach was the fifth strongest—stronger than perceived risk of COVID-19, underlying health conditions status, and trust in scientists. These findings suggest that considering the intersections of morality and upward social comparison may help to explain vaccine hesitancy.