In this episode, we explore the concept of chronotype, which reflects an individual's biological circadian timing and how it manifests in preferred sleep–wake patterns. Understanding chronotype is important because it differs from simple diurnal preference, which may be shaped by lifestyle or psychological factors rather than biology. We examine how chronotype is measured, from gold-standard laboratory methods to validated questionnaires used in field studies. The discussion also highlights the importance of accounting for sleep debt when estimating true biological timing. Finally, we consider the limitations of consumer devices and the practical implications of assessing chronotype in real-world settings. Timestamps [02:02] Understanding chronotypes [06:26] Measuring chronotypes [15:12] Genetic and environmental influences on chronotypes [28:34] Health implications of chronotypes [52:21] Practical applications Related Resources Join the Sigma email newsletter for free Subscribe to Sigma Nutrition Premium Become a member of Alan Flanagan's Alinea Nutrition Education Hub Enroll in the next cohort of our Applied Nutrition Literacy course Related previous episodes: 495, 470, 469

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