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GLUCOSE (D-glucose) is an essential fuel for the brain and many other tissues. Five glucose-transporter proteins facilitate the diffusion of glucose across lipophilic plasma membranes.^{1 2 3} This process is saturable and stereospecific, but it is not concentrative, energy dependent, or influenced by sodium. In humans, the erythrocyte glucose transporter (type 1 glucose transporter) has been studied most extensively. It accounts for 2 to 5 percent of the erythrocyte-membrane protein and seems to be identical in molecular weight and antigenic properties to the glucose transporters in the endothelial cells of brain capillaries.^{4 5 6 7} Brain capillaries contain large amounts of messenger RNA for the . . .