Brighten the coldest winter day with this delicious and healthy citrus.

First bred in Barbados, this bitter fruit is a favorite of many dieters for its low glycemic index, which many believe helps burn fat. Coming in different varieties, including red, white and pink, the grapefruits flavor can range from sour to sweet and tart. High in antioxidants, vitamin C and the fiber pectin, studies have shown grapefruit helps lower cholesterol when eaten regularly.