New Delhi, Nov 5 (ANI) : A new research has revealed that graveyard shift workers should avoid eating high-iron foods at night so that they don't disrupt the circadian clock in their liver.The body's primary circadian clock, which regulates sleep and eating, is in the brain, but other body tissues also have circadian clocks, including the liver, which regulates blood glucose levels.Disrupted circadian clocks are the reason that shift workers experience higher incidences of type 2 diabetes, obesity and cancer.High iron intake may also interfere with the normal day to night fluctuations associated with a healthy metabolic system.