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Drinking orange juice could slash the risk of dementia in half as it protects the brain. Fruits and vegetables are rich in vitamins and nutrients, including antioxidants, that can help protect the brain. In this most recent study of men around 50 they found 6 portions a day of fruits and veggies did wonders but similar results were also found in a test group that ate a relatively small amount of fruits and veggies but had a small glass of orange juice daily.