Why you should be consuming more grapefruit - Trying to lose weight? According to one study, eating half a grapefruit before each meal may help you slim down faster, thanks to the fruit's fat-burning properties and its beneficial effect on blood sugar and insulin levels. Grapefruit is also hydrating, filling, and packed with immunity-boosting antioxidants. Furthermore, a glass of chilled grapefruit juice, especially in winter, helps seriously boost your levels of vitamin C, which gives grapefruits a high place amongst various citrus fruits. It's packed with the benefits derived from various nutrients and vitamins, including potassium and lycopene.