You probably associate vitamin D with bone health, but that’s just a fraction of the picture. There are receptor sites for this vitamin throughout the brain and deficiency is associated with a range of neurological disorders, including depression, schizophrenia, dementia (including Alzheimer’s) and Parkinson’s disease.
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Along with chronic diseases, something else is starting to surface, something less visible but arguably more sinister. The human brain is shrinking, as confirmed by a body of research that has been accumulating since 1988. This shrinkage — atrophy — began during the Epipaleolithic period, which was the transitional period between hunter-gathering and agriculture, and remains an ongoing phenomenon. Over the last 20,000 years, average brain size has decreased by 10%. What’s even more alarming is that the last 4,000–6,000 years have witnessed an acceleration of this atrophy.
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