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. 2021 Jul 29;8:662310. doi: 10.3389/fnut.2021.662310

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Copyright © 2021 Koppold-Liebscher, Klatte, Demmrich, Schwarz, Kandil, Steckhan, Ring, Kessler, Jeitler, Koller, Ananthasubramaniam, Eisenmann, Mähler, Boschmann, Kramer and Michalsen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Bahá'í fasting advanced the circadian phase in particular of late chronotypes. (A) The circadian phase of 16 study participants was assessed, using the blood monocyte-based BodyTime assay (26) before (V0), during (V1), and 3 weeks after BF (V2). The circadian phase corresponds to the BodyTime-predicted DLMO, which usually occurs about 2 hours before habitual bedtime. (B) The extent of advancing the circadian phase during BF correlated with chronotype (i.e., the circadian phase before BF).