Scientists have discovered that the body uses several different pathways for the absorption of different carbohydrates. Simple carbs like glucose, fructose, sucrose and maltodextrin are each carried through the intestines by specific transporter proteins that aid in absorption. Once you've consumed a certain amount of one of these types of carbohydrates, the transporter proteins become saturated, and the body is unable to use any more of that type of carb. But by combining several different types of sugars in a single meal, the body can maximize the amount of carbs absorbed by utilizing multiple protein absorption pathways at the same time. For an endurance runner, cyclist or triathlete, those extra carbs could mean the difference between setting a personal record and nearly bonking in the homestretch.