It's about time: Circadian rhythm and metabolism

Schilperoort, M.

Throughout evolution, humans have lived in synchrony with the natural light-dark cycle. Our bodies were used to going to sleep a few hours after dark, and waking up just before dawn. However, in modern society the unambiguous availability of artificial light has desynchronized our biological clock from the naturally occurring day and night, with large consequences for metabolic health. This thesis sheds light on the negative health consequences of a disturbed biological clock, and elucidates novel approaches to prevent disease associated with chronic rhythm disruption, as occurs in shift work. We have identified important mechanisms through which rhythm disruption contributes to (cardio)metabolic disease, namely by exacerbating vascular inflammation and by deregulating rhythm in glucocorticoid hormone, thereby affecting the metabolic activity of tissues such as brown fat and bone. We continued by investigating two main approaches to prevent diseases associated with circadian...Show moreThroughout evolution, humans have lived in synchrony with the natural light-dark cycle. Our bodies were used to going to sleep a few hours after dark, and waking up just before dawn. However, in modern society the unambiguous availability of artificial light has desynchronized our biological clock from the naturally occurring day and night, with large consequences for metabolic health. This thesis sheds light on the negative health consequences of a disturbed biological clock, and elucidates novel approaches to prevent disease associated with chronic rhythm disruption, as occurs in shift work. We have identified important mechanisms through which rhythm disruption contributes to (cardio)metabolic disease, namely by exacerbating vascular inflammation and by deregulating rhythm in glucocorticoid hormone, thereby affecting the metabolic activity of tissues such as brown fat and bone. We continued by investigating two main approaches to prevent diseases associated with circadian disturbances: (1) by limiting disruption of the circadian timing system, and (2) by directly targeting the affected tissues. We found that timed feeding (1) and stimulation of the metabolic activity of brown fat (2) are both promising strategies to prevent and/or reduce (cardio)metabolic disease risk in the ever-increasing population of individuals who suffer from circadian disturbances.
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It's about time: Circadian rhythm and metabolism