Half of a ruby red grapefruit provides 64 percent of the daily value for vitamin C, 28 percent of the DV for vitamin A and 8 percent of the DV for fiber. This serving only has 52 calories, most of which come from carbohydrates, as a grapefruit only contains 0.9 gram of protein and 0.2 gram of fat. Vitamin C acts as an antioxidant to help prevent damage to your cells, and vitamin A is essential for healthy vision and immune function. Dietary fiber helps make foods more filling and lowers your risk for high cholesterol and constipation.
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