This study examined the association between healthy eating practices and childhood dietary habits in young adults, and the presence of gender-based differences in this association. In this cross-sectional study, 500 Japanese young adults aged 18–29 years completed an online questionnaire comprising items that assessed healthy eating practices and childhood eating habits. Content analysis was used to examine open-ended data. Logistic analysis was performed to examine the association between the prevalence of healthy eating practices and childhood eating habits. In this study, 56.2% of the participants practiced healthy eating. In the content analysis, gender-based differences in the primary eating practices and primary reasons for not adhering were identified. The logistic regression analysis identified gender-based differences to be associated with childhood eating habits and healthy dietary practice, such as "receiving nutrition education" for men and "maintaining a healthy diet" for women. In conclusion, gender-based differences were found in factors related to healthy eating practices among young adults.

  In the present study, to clarify the risk of heat disorder and thermal comfort during moderate exercise while wearing a mask in a hot environment, masks to prevent infection of three different types were compared in a subjective experiment in a climatic chamber. We evaluated the materials' physical properties and the comfort-related performance of each mask. The external ear temperature of each mask was lower than the standard for a serious condition of heat disorder, indicating that each mask does not pose a significant risk of heat disorder. The particle collection efficiency of the pleated nanofiber-nonwoven mask (NF) was above 90%. The mask microclimate temperature and uncomfortable feeling of NF were lower than other masks. For moderate exercise in a hot environment, the NF was found to be the most suitable mask in terms of infection prevention and thermal comfort.