I am 30 year old and I love to eat grapefruit. But I am not sure that whether it is good for my diet plan or not? Are the calories content too high or too low? What is the exact amount of calories in a grapefruit? Is it a healthy option or other fruits better than grapefruit? It will be helpful if you could also give a complete nutritional information on grapefruits. Please help me with my query.