Purpose of review: Obesity is a major public health problem and substantially increases the risk of type 2 diabetes, hypertension, stroke, cardiovascular, respiratory problems, gall bladder disease, osteoarthritis and sleep apnoea, as well as certain cancers. The prevalence of obesity is rapidly increasing worldwide. However, for individuals weight is regulated within a narrow range. This regulation depends on energy intake (in the form of food) and energy expenditure. Recently, there has been a remarkable increase in our understanding of the homeostatic mechanisms that control food intake and energy homeostasis.
Recent findings: There is increased understanding of the central regulation of appetite. In particular, this includes new knowledge about the hypothalamus and brainstem and their relation to food intake regulation. Peripheral hormones (notably adipostat factors and gut hormones) have now been found to be important in food intake regulation.
Summary: Complex central circuitry controls food intake. Circulating hormones, in particular the gut hormones have unexpectedly been found to be very important in appetite control. The gut hormones are thus new and exciting targets for future obesity therapies.