Influence of fasting during the night shift on next day eating behavior, hunger, and glucose and insulin levels: a randomized, three-condition, crossover trial

Author(s)

Teixeira, Bruno Simao ; Silva, Catarina Mendes ; Silva, Alinne Tatiane Faria ; Santos, Leticia Lopes Dantas ; Maia, Yara Cristina de Paiva ; Pedrazzoli, Mario ; Wright Jr, Kenneth P. P. ; Crispim, Cibele Aparecida

• Document type: Journal article
• Source: EUROPEAN JOURNAL OF NUTRITION; v. N/A, p. 13-pg., 2022-12-17.

Abstract

Aims To investigate the influence of fasting during the night shift on eating behavior, hunger, glucose and insulin levels the following day. Methods Study with 10 male police officers who have been working at night. Participants were tested under three different conditions separated by at least 6 days of washout in a randomized, crossover design: "Night Shift Fasting " (NSF)-two nights of fasting during the night shift; "Night Shift Eating " (NSE)-two nights with the consumption of a standardized meal during the night shift (678 +/- 42 kcal consumed at similar to 0200 h); and "Nighttime Sleep " (NS)-two nights of sleep. The morning after, blood glucose and insulin and hunger ratings were assessed, and food intake was assessed with an ad libitum test meal. Food intake was also assessed throughout the remainder of the day using a food record. Generalized Estimating Equations were used to analyze the effect of experimental condition. Results Food intake during the test meal, especially of proteins and fats, was higher after fasting during the night shift compared to the other conditions (p < 0.05), whereas desire to eat scores were lower after the NSF compared to NSE condition (p = 0.043). Hunger levels were lower after the NSF compared to the NS condition (p = 0.012). Insulin and HOMA-IR were also lower in the morning after NSF (p < 0.001). Conclusion Fasting during the night shift leads to not only a higher intake of energy and macronutrients both in the early morning after work and throughout the next day, but also lower insulin levels and HOMA-IR in the morning. (AU)

• FAPESP's process: 11/05804-5 - Phenotypic characterization of circadian rhythms in different genotype individuals for clock gene polymorphisms in different regions in Brazil: an emphasis on the effect of the gene PER3 and latitude
• Grantee: Mario Pedrazzoli Neto
• Support Opportunities: Regular Research Grants