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During the winter season, our bodies become prone to flu, cough, cold and viral infections. Oranges play an important role in boosting immunity during this season. The vitamin C present in oranges activates the body’s immune system, making it able to fight infections. According to doctors, eating an orange a day provides antioxidant support and reduces fatigue. In mountainous areas where there is extreme cold, oranges not only nourish the body but also increase energy. Hence, they are considered a natural health shield during winters.