Health and Fitness

Changes in chronotype and social jetlag during adolescence and their association with concurrent changes in BMI-SDS and body composition, in the DONALD Study

N. Jankovic, S. Schmitting, et al.

This compelling study unveils the connection between chronotype, social jetlag, and body composition changes during adolescence, revealing that a later chronotype and heightened social jetlag are linked to increased fat mass. The research conducted by Nicole Jankovic, Sarah Schmitting, Bettina Krüger, Ute Nöthlings, Anette Buyken, and Ute Alexy emphasizes that the sensitive age period between 12 and 15 years is critical for understanding these effects.

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Abstract

This study investigated the relationship between changes in chronotype and social jetlag and changes in body composition during adolescence. Using data from the DONALD study (213 adolescents, 9–17 years at baseline), the researchers found that a later chronotype and increased social jetlag were significantly associated with increased fat mass index (FMI) and BMI standard deviation scores (BMI-SDS). These associations were strongest in the 12–15-year-old age group. No significant association was found with fat-free mass index (FFMI). The findings suggest that the period between 12 and 15 years of age may be particularly sensitive to the effects of chronobiological changes on body fatness.

Publisher

European Journal of Clinical Nutrition

Published On

Oct 26, 2021

Authors

Nicole Jankovic, Sarah Schmitting, Bettina Krüger, Ute Nöthlings, Anette Buyken, Ute Alexy

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