According to the sources, more than 13,000 older adults for up to seven years to see how many developed dementia. Rates of dementia among those eating citrus fruits at least once a day were significantly lower than in volunteers having them less than twice a week.
The citric acid contains a chemical nobiletin, which in animal tests has shown to slow or reverse impairment of memory. Some biological studies have indicated citrus may have preventive effects against cognitive impairment. But no study has examined the relation between citrus consumption and rates of dementia. The frequent consumption is linked with a lower risk of dementia.
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