Evidence supporting the use of: Glucose
For the health condition: Concentration (poor)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Glucose has been studied for its effects on cognitive function, including concentration and attention. Scientific evidence indicates that glucose, as the primary energy source for the brain, can temporarily enhance certain aspects of cognitive performance, particularly in situations where mental effort is high or during prolonged tasks. Several controlled studies have shown that consuming glucose (typically in the form of a sugary drink or tablet) before or during cognitive testing can lead to modest, short-term improvements in memory, attention, and concentration, especially in individuals who have not eaten recently or are performing demanding mental tasks.

The proposed mechanism is based on the fact that neuronal activity relies heavily on glucose metabolism, and mild increases in blood glucose can temporarily optimize brain function. However, these benefits are generally short-lived and more pronounced in situations involving cognitive fatigue or fasting. Chronic or excessive glucose intake, on the other hand, is not beneficial and may have adverse effects on overall health.

It is important to note that while the "glucose facilitation effect" is supported by research, the magnitude of the effect is relatively small and highly context-dependent. There is no evidence that routine glucose supplementation significantly improves concentration in healthy, well-nourished individuals during normal daily activities. Most guidelines do not recommend glucose as a general aid for concentration outside of specific circumstances (e.g., hypoglycemia, fasting, or cognitively demanding tasks).

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