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Abstract To analyze the relationship between body mass index (BMI) of young adult and their birth weight. Methods: A retrospective cohort study was conducted to investigate the epidemiology of young adult aged 18~24 from colleges and universities. the questionnaire includes the BMI of parents, and birth weight and BMI of young adult. Multinomial logistic regression was used to analyze the association between birth weight and BMI of the young adult. Results: Among the 8578 young adult who met the inclusion criteria, 2574 young adult were underweight, accounting for 30.0%, and 384 persons were overweight or obese, accounting for 4.5%. There were 1077 young adult with low birth weight, accounting for 12.6%, and 509 young adult with high birth weight, accounting for 5.9%. Those young adult with low birth weight are more likely to be underweight (adjusted OR=1.34, 95%CI 1.15-1.59) and also more likely to be overweight or obese (adjusted OR=1.22, 95%CI 0.851.76) when compared to those young adult with normal birth weight (3000g-3499g). Those young adult with high birth weight were more likely to be overweight or obese (adjusted OR=1.51, 95%CI 1.03-2.21). Conclusion: It demonstrates a “J” shape relation between birth weight and the risk of overweight or obesity of young adult, but there is a declining relation between birth weight and the risk of underweight of young adult.
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