The consumption of solid fruits like blueberries, apples and grapes can lower the probability of developing type 2 diabetes, while drinking fruit juices can increase the risk, according to a study of more than 187,000 U.S. nurses and health workers over two decades published in the BMJ. Participants given three weekly servings of blueberries, grapes, raisins, apples and pears reduced their diabetes risk by 7%.

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