The regulation of energy balance occurs in the hypothalamus. There, afferen
t hormonal and neural signals of hunger versus satiety and energy depletion
versus repletion are integrated to influence the efferent signals of calor
ic intake and energy expenditure. Defects in this complex neuroendocrine ne
gative feedback loop give rise to various hormonal and genetic obesity synd
romes and provide insight into therapeutic strategies for obesity managemen
t.