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If appropriate blood glucose reserves are not available, memory and learning decline. The harder the brain is being used the more important it is to have adequate levels of blood and brain glucose. (Carper, Jean. Your Miracle Brain. NY: HarperCollins Publishers, 2000, pp 111-112)

Insulin is released when blood sugar levels get too high. Adrenaline is released when blood sugar levels drop too low, as happens in the rebound effect of a high sugar intake. When this occurs symptoms mimic an anxiety reaction (e.g., racing pulse, sweaty palms, labored breathing, dry mouth). (Padus, Emrika, et al. The Complete Guide to Your Emotions & Your Health: New Dimensions. PA: Rodale Press, 1986, pp 20-22)