body clock• The need for time-cues to produce a body clock with a stable 24-hour period has already been described.• This theory also implies that the internalbody clock takes up to five years to develop fully.• Is it a function of our body clock or our life-style, or due to some interaction between the two?• Clearly, a rhythm in food intake might be able to adjust the body clock via several mechanisms.• In all cases, the effect of the body clock is being accentuated by our life-style, generally by means of the hormoneadrenalin.• This result might indicate that the body clock is slow to mature in prematurebabies.• Those few studies that have been carried out in free-running experimentssuggest that the body clock might run slightly faster.• Adjusting your body clockSometimes we want to change the timing of our life-style.