Rice is plant that produces an edible grain; the name also used for the grain itself. Rice is the primary food for half the people in the world. In many regions it is eaten with every meal and provides more calories than any other single food.
According to the United Nations Food and Agricultural Organization (FAO), rice supplies an average of 889 calories per day per person in the United States. Rice is a nutritious food, providing about 90 percent of calories from carbohydrates and as much as 13 percent of calories from protein.