The most nutritious granola bars are made of all-natural ingredients and have high levels of fiber and protein, little or no added sugar and no artificial preservatives. For sugar content, look for bars that are 25 percent sugar or less, and avoid bars with higher sugar content than that. Note that granola bars may use other names for sugar, including corn syrup, brown rice syrup, honey, invert sugar, molasses, barley malt extract, fructose, and dextrose. Bars with nuts are usually healthy because nuts are tasty and contain high levels of protein. Also, look for bars with 150 calories or less. Some granola bars contain as much sugar, carbs and calories as candy bars, and you don't want to end up gaining 5 pounds over opening weekend!