Both oranges and grapefruit are similarly matched in terms of being low calorie with zero fat, cholesterol or sodium. Eating a whole medium orange will provide 80 calories versus 60 calories when eating a half of a grapefruit. Oranges have overall higher carbohydrates, breaking down into more grams of sugar and fiber than grapefruit. Oranges provide more vitamin C, offering 130 percent of the daily needs as well as being higher in selenium and one of the B vitamins, thiamin. Oranges also have slightly more folate than grapefruits. On the other hand, grapefruits have significantly more vitamin A at 35 percent versus 2 percent and slightly more phosphorus, while still providing 100 percent of the daily dose of vitamin C.
Oranges are commonly eaten whole or juiced. The rind can be zested to add flavor to recipes, and the more sour varieties can be made into marmalades to help sweeten them. The blossoms from the orange tree are commonly used in teas and as decorative touches in some Asian countries. The peel can be used as a slug repellent for gardeners, and a special type of honey can be made by having bees in citrus groves during bloom. This honey is called orange blossom honey and picks up the flavor of oranges.
The juice is also popular as a breakfast beverage.When not eaten fresh,grapefruit is a popular fruit in canned fruit cup and fruit salad mixes.In a few countries such as Australia, grapefruit is enjoyed as a marmalade or jelly. The peel of the fruit can be candied and used as a source of pectin for preservation of other fruits. The peel oil is used to flavor many different sodas as well as enhance the flavor of other juices.