Exercise could protect against Alzheimer's by triggering a hormone which helps regrow brain cells, a study has found. Scientists have known for some time that exercise reduces the risk of developing dementia, but did not know if there was a direct link or whether ill people were simply unable to work out. Now a new series of studies had shown that a hormone released during exercise, called irisin, is depleted in the brains of people with Alzheimer’s, and can protect animals against memory...
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