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This paper offers a unique perspective about the development of the online-to-offline (O2O) food delivery industry from 2017 to 2019 in China. This study demonstrates the latest transformation and improvements of the O2O market that address some common problems in the early stages of the development of this raising industry in China. New strategies and regulations from the O2O platforms, food providers, and national and local governments are discussed. In our view, the mission of the O2O industry in general has shifted from pursuing enormous quantity to ensuring high quality. China's O2O food delivery industry warrants further attention and studies as it grows and develops into the future. We suggest future studies to work on its economic, behavioral, and health impacts on population level as it encompasses both great risks and rewards., Author(s): Xueyin Zhao [sup.1] [sup.2] , Wenhui Lin [sup.1] [sup.2] [sup.3] , Shuyi Cen [sup.1] [sup.2] , Haoyu Zhu [sup.4] , Meng Duan [sup.1] [sup.2] , Wei Li [sup.1] [sup.5] [...]

Background Some studies have suggested that daytime napping may increase the risk of type 2 diabetes. However, limited data have revealed the association between nap duration and other metabolic diseases. Data from the baseline survey of Lanxi Cohort Study, a population-based study of natural residents in Zhejiang Province, China, were used to investigate the relationship between nap duration and metabolic abnormalities. Methods A total of 3236 participants underwent a physical examination, laboratory tests, and face to face interview. They were categorized into four groups according to nap duration. Logistic regression models were used to examine the odds ratios (ORs) of napping duration with four metabolism-related diseases. Stratified analysis was further used to explore the interaction effects of gender and age on results. Results Compared to the no daytime napping group, people who napped during the daytime for more than 1 h were independently associated with a greater prevalence of diabetes (OR 1.56). Those who napped during the daytime within a half hour showed a lower prevalence of fatty liver, dyslipidemia, and central obesity. To be more specific, those who habitually napped during the daytime for more than 1 h exhibited an increasing prevalence of diabetes among female older than 50 years old. Those who habitually napped during the daytime within a half hour exhibited a decreasing prevalence of fatty liver and dyslipidemia among male Conclusions Short daytime napping duration is associate with reduced rate of metabolism-related diseases and may protects people from negative health conditions, whereas long daytime napping duration is associate with higher prevalence of diabetes, which then can be harmful for health., Author(s): Xueyin Zhao [sup.1] [sup.2] , Lin Cheng [sup.3] , Chaonan Zhu [sup.4] , Shuyi Cen [sup.1] [sup.2] , Wenhui Lin [sup.1] [sup.2] , Weifang Zheng [sup.5] , Min Yang [...]