SWANSEA, UNITED KINGDOM. The human brain requires glucose and oxygen in order to function. During rest the brain accounts for 20% of the body's energy consumption even though it comprises only 2% of total body weight. Recent studies using position emission tomography (PET scan) has shown that increased mental activity is associated with increased glucose metabolism and that the glucose goes directly to the areas of the brain involved in the mental activity at hand. Researchers at the University of Wales provide a review of the effect of carbohydrates on memory and mood. Among the highlights of their findings:
The researchers conclude that the nature and timing of meals and snacks can influence psychological functioning and that the glycemic load of the diet has a
direct impact on mood and memory.