Grapefruit is low in calories but full of nutrients. It is excellent source of vitamin C and vitamin A, which are very important for immune system. Besides that, vitamin C is a natural antioxidant. Antioxidants are good for your body because they neutralize free radicals which can cause serious damage to cells, including damage that may lead to cancer.
Grapefruit contains a fair amount of potassium, which plays important role in keeping your heartbeat normal and your muscles working properly.
Grapefruit not only reduces risk of cancer and heart disease, but also reduces the risk of obesity, and helps prevent constipation.