Dietary ketosis enhances memory in mild cognitive impairment

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URL: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3116949/

Journal: Nuerobiology of Aging

Publication Date: 02/2012

Summary: We randomly assigned 23 older adults with Mild Cognitive Impairment to either a high carbohydrate or very low carbohydrate diet. Following the six-week intervention period, we observed improved verbal memory performance for the low carbohydrate subjects (p = 0.01) as well as reductions in weight (p < 0.0001), waist circumference (p < 0.0001), fasting glucose (p = 0.009), and fasting insulin (p = 0.005). Level of depressive symptoms was not affected. Change in calorie intake, insulin level, and weight were not correlated with memory performance for the entire sample, although a trend toward a moderate relationship between insulin and memory was observed within the low carbohydrate group. Ketone levels were positively correlated with memory performance (p = 0.04). These findings indicate that very low carbohydrate consumption, even in the short-term, can improve memory function in older adults with increased risk for Alzheimer’s disease. While this effect may be attributable in part to correction of hyperinsulinemia, other mechanisms associated with ketosis such as reduced inflammation and enhanced energy metabolism also may have contributed to improved neurocognitive function. Further investigation of this intervention is warranted to evaluate its preventive potential and mechanisms of action in the context of early neurodegeneration.

Key Takeaways

Low carbohydrate ketogenic diets showed improved memory, weight loss, blood sugar, and fasting insulin in adults with mild cognitive impairment. Further research is needed to determine whether the improvement is due to correction of high insulin levels, or the reduction in inflammation brought about by the ketosis.

Ketogenic Diet Improves Memory in Adults With Cognitive Impairment

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