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Beans are great to keep your blood sugar in check, which is crucial for the brain. Beans also have a lot of magnesium, which is needed for more than 300 functions in the body. High dietary intake of magnesium has been linked to a lower risk of dementia while some Alzheimer’s patients have low blood and brain levels of magnesium, according to the Alzheimer’s Drug Discovery Foundation. The mineral speeds the transmission of messages in the brain and relaxes blood vessels.