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The relevance of chronotype and infant feeding for the link between diurnal timing of food intake and overweight or type 2 diabetes risk

Subject Area Nutritional Sciences
Public Health, Healthcare Research, Social and Occupational Medicine
Term from 2014 to 2026
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 254799859
 
Final Report Year 2024

Final Report Abstract

The project aimed to assess the impact of circadian eating patterns and chronotype on metabolic health from infancy to young adulthood. We examined whether misalignment between individual circadian rhythms (i. e. chronotype) and the timing of energy or carbohydrate intake leads to adverse metabolic outcomes in the short and long term, and whether circadian infant eating patterns influence body composition in childhood. To this end, DONALD data from approx. 1,500 infants, children and adolescents provided longitudinal insights on chronotype, day-time specific dietary intake, and anthropometrics as well as type 2 diabetes risk factors from blood samples drawn in adulthood. Additionally, the project included a short-term controlled nutrition intervention. In the intervention, 45 students aged 18-25 (22 with early and 23 with late chronotypes) participated in a randomized, crossover trial to determine if glycemic responses differ when a high-glycemic index (GI) meal is consumed either in alignment or misalignment with chronotype. Continuous glucose monitoring assessed glucose levels and variability. Results showed that circadian eating patterns established in infancy track through pre- and primary school ages, yet no link was found between these early patterns and body composition in primary-school-aged children. However, a later chronotype and increased social jetlag were linked to higher body fat in adolescents and greater visceral fat in young adults. Students with a late chronotype also exhibited more irregular meal timing, but lockdown conditions allowed them to reduce social jetlag and synchronize meal timing with their internal clocks. Among adolescents with a later chronotype, those delaying peak calorie intake relative to the group median showed notable increases in fat mass over nearly a year. Conversely, adolescents with early chronotypes were more affected by later carbohydrate consumption, which negatively impacted adult insulin sensitivity. The intervention also highlighted chronotype-specific glycemic responses: only early chronotypes had higher glycemic responses to evening high-GI meals, while late chronotypes showed similar glycemic responses regardless of meal timing, suggesting vulnerability to both early and late high-GI meals. In summary, a later chronotype appears to increase susceptibility to misalignment in meal timing and adverse body composition. Interventions are needed to help adolescents and young adults better align their dietary patterns with their chronotype to support metabolic health.

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