Cognitive diseases are often associated solely with the brain, but new evidence indicates that other parts of the body also play a role.
Particularly among individuals over the age of 45 in the early stages of disease, new patterns are emerging.
According to Medical Xpress, a research review published in the journal Nutrition Research compiles findings from 15 studies involving a total of 4,275 participants from several regions of the world.
In these studies, researchers examined the relationship between gut bacteria and the ability to think and remember.
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The effect of diet
The studies explored, among other factors, the effects of different dietary patterns and treatments, including the Mediterranean diet, the ketogenic diet, probiotics, and fecal transplantation.
The results indicate that diet, in particular, can influence brain function. Both the Mediterranean diet and the ketogenic diet were associated with improved cognitive abilities.
At the same time, researchers observed changes in gut bacteria and an increased production of substances that protect the brain.
The gut–brain axis
These effects are linked to greater diversity in gut bacteria, higher levels of beneficial fatty acids, and reduced inflammation in the brain.
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However, among individuals with advanced Alzheimer’s disease, the effect was limited.
The gut and the brain interact closely through what researchers refer to as the gut–brain axis.
Overall, the findings suggest that a healthy gut may help slow cognitive decline, with the greatest impact occurring when interventions begin early.
Sources: Medical Xpress and Nutrition Research.
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