Since we know that there are 4 calories/gram in carbohydrate, how many calories from carbohydrates are in one serving?

Carbohydrate has 4 calories per gram. About 50 to 60 percent of your total daily calories should come from carbohydrate. Carbohydrate contains the most glucose and gives the quickest form of energy.

A gram of carbohydrate contains 4 calories. A gram of protein also contains 4 calories. A gram of fat, though, contains 9 calories — more than twice the amount of the other two. That's why one food with the same serving size as another may have far more calories.

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