Food and the Circadian Activity of the Hypothalamic-Pituitary- Adrenal Axis

Circadian rhythmicity is present in most organisms living under natural conditions and its most important role is to facilitate adaptation of the organism to periodic fluctuations in the external environment (1). In particular, the food-seeking behavior might have forced the development of specialized functions of the circadian timing system that enable the organism to be prepared for food seeking, digestion and metabolism (2).