Vitamin C is well-known for its ability to boost your immune system and help ward off colds and the flu, and an entire grapefruit has more than 100 percent of your recommended daily value of the vitamin. The red and pink varieties of grapefruit are full of bioflavonoids, chemicals that stimulate the performance of disease-fighting cells. Dietary vitamin C is critical to helping your body attack invading viruses and bacteria.

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