dual control theory

• The hypothalamus is a pea-sized structure within the brain that has a crucial role in integrating the nervous and endocrine systems. It is also involved in homeostasis, the mechanism by which an organism maintains a steady internal environment via balancing bodily processes within certain limits. This neural mechanism regulates the level of glucose in the blood, which is the most basic of sugars and the bodies main source of energy and helps detect whether the body has enough nutrients and correcting this when required.
• the 'satiety centre' was located in the ventromedial hypothalamus and the 'feeding centre' was located in the lateral hypothalamus,
• The lateral hypothalamus, when stimulated has been found to elicit feeding behaviour. Researchers have discovered that damage to the lateral hypothalamus in rats cause a condition called aphagia (Greek for 'absence of eating'). 
• Research into the ventromedial hypothalamus has found that when damaged, this caused rats to overeat. Stimulation of this area inhibited feeding which led researchers to conclude that the ventromedial hypothalamus is responsible for the signal to stop eating based on the many glucose receptors in this area.
• when blood sugar is low- the liver sends signals to the lateral hypothalamus which causes the neurone to fire that makes you feel hungry and start eating
• once you eat, glucose is released into the blood detected by the ventromedial hypothalamus causing neurone to fire that makes you feel satiated