The continuous transfer of fuel from the blood to tissues, and its adjustment to the rate of
energy metabolism involve close relationships between the control of endogenous stores
and that of the periodic intake of food. Neural and blood-borne signals to the brain and
efferent sympathetic and parasympathetic pathways seem responsible for three different
metabolic and feeding cycles. The matching of input and output of glucose to and from the
blood, ie the regulation of the blood glucose level proper, is achieved by a short-term …