2. Currants

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A berry that looks a bit like a darker-colored blueberry, black currants are often used to make jams, jellies, fruit drinks and juices. Like most natural foods, they are most beneficial when eaten in their uncooked and unprocessed form. In addition to their very high vitamin C content which helps strengthen the immune system, black currant may also help to improve vision, particularly when it comes to seeing well at night.