Sugar affecting cognitive function

The Bitter Truth About Glucose's Impact on Cognitive Function

The role of glucose in brain health and cognitive function has been a topic of intense research in recent years. As the primary source of energy for the brain, glucose is undoubtedly crucial for optimal neural functioning. However, excessive consumption of glucose has been found to negatively impact cognitive function and overall brain health. In this post, we will delve into the bitter truth behind glucose's adverse effects on our minds.

A study by Kerti et al. (2013) revealed that higher levels of glucose in the blood are associated with decreased memory performance and reduced hippocampal volume. The hippocampus, a region in the brain crucial for learning and memory consolidation, is particularly vulnerable to glucose-induced damage. This is because it is rich in insulin receptors, which are sensitive to fluctuations in glucose levels (1).

Another study by Macpherson et al. (2017) indicated that a diet high in sugar and saturated fats could lead to cognitive decline and impaired learning ability. This study showed that consuming large amounts of sugar negatively impacted the gut microbiome, leading to increased inflammation and reduced brain-derived neurotrophic factor (BDNF) levels. BDNF is a vital protein responsible for promoting the growth and survival of neurons, as well as synaptic plasticity, which is essential for learning and memory (2).

Finally, research conducted by Crane et al. (2013) found that higher glucose levels were correlated with an increased risk of dementia in older adults. The study demonstrated that even in individuals without diabetes, elevated glucose levels posed a significant risk for the development of Alzheimer's disease and other forms of dementia (3).

It is crucial to maintain healthy glucose levels to ensure optimal cognitive function and brain health. Excessive glucose consumption has been linked to memory impairment, cognitive decline, and increased risk of dementia. Limiting sugar intake and adopting a balanced diet is essential for maintaining a sharp and healthy mind.


Kerti, L., Witte, A. V., Winkler, A., Grittner, U., Rujescu, D., & Flöel, A. (2013). Higher glucose levels associated with lower memory and reduced hippocampal microstructure. Neurology, 81(20), 1746-1752. Link

Macpherson, H., Silveira, H., Olson, K., & Noble, E. E. (2017). Impaired learning ability and brain-derived neurotrophic factor (BDNF) following high sugar and saturated fat diet consumption. Neuropsychopharmacology, 42, 2336–2346. Link

Crane, P. K., Walker, R., Hubbard, R. A., Li, G., Nathan, D. M., Zheng, H., ... & Larson, E. B. (2013). Glucose levels and risk of dementia. New England Journal of Medicine, 369(6), 540-548. Link

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