Circadian Cycle

Tempo de Leitura: < 1 minutos

What is it?

The circadian cycle comprises the metabolic fluctuations that occur during the day in the body, this is adjusted and accompanies changes in the environment, besides being influenced by light, temperature etc.

What is the circadian cycle for?

The brain receives numerous information during the day and night, being the role of the regular circadian cycle and coordinating this information, assisting in the release and production of hormones such as sleep-inducing hormones. The patterns of light and darkness captured by the eyes will be determinant of the cycle, defining the sleep and wake pattern, and when there is darkness the production of melatonin is activated and when the retina detects light such production is decreased so that the individual remains awake during the day.

How does the circadian cycle work?

In humans, control is done in the central nucleus or suprachiasmatic nucleus, hypothalamus and pituitary glands, regions responsible for adjustments in biological activities.

When do you need to supplement?

Since sleep disorders are increasingly frequent, the auxiliary treatment to be used in clinical practice is hygiene in order to adapt this circadian cycle. In addition, the establishment of a routine with fixed schedules for sleeping, getting up and making meals helps in its self-regulation.


Effect of light-dark cycle inversion:
Espinoza Gallardo, A. C., López-Espinoza, A., Vázquez-Cisneros, L. C., Zepeda-Salvador, A. P., & Santillano-Herrera, D. (2021). Light-dark cycle inversion effect on food intake and body weight in rats. Efecto de la inversión del ciclo de luz-oscuridad sobre el consumo de alimentos y el peso corporal en ratas. Nutricion hospital,


(3), 495–501.

Reading suggestion:
Circadian cycle and metabolism regulation

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