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Eating for hunger or pleasure: a Serotonin Model 
Zili Yan1 , Yanlin He2 , Xing Cai3 , Gang Shu4,* , Yong Xu1,5,*
1Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA
2Brain Glycemic and Metabolism Control Department, Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, LA 70808, USA
3State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China
4Guangdong Laboratory of Lingnan Modern Agriculture and Guangdong Province Key Laboratory of Animal Nutritional Regulation, College of Animal Science, South China Agricultural University, Guangzhou 510642, China
5Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
*Correspondence to:Gang Shu , Email:shugang@scau.edu.cn Yong Xu , Email:yongx@bcm.edu
J Mol Cell Biol, Volume 13, Issue 9, September 2021, 693-694,  https://doi.org/10.1093/jmcb/mjab055

Obesity, resulting from an imbalance between energy intake and expenditure, represents a major health crisis to our society, due to its alarmingly high prevalence and comorbidities, including diabetes, cardiovascular diseases, cancer, and COVID-19. Better understanding the neurobiological mechanisms for feeding behavior is essential for developing rational strategies to combat obesity and related comorbidities.