Snatching an on-the-go breakfast is better than skipping it altogether; numerous studies show that people who eat a morning meal are slimmer and have lower cholesterol levels and better memory recall than those who don't. But many of those seemingly healthy breakfast bars so great for eating on the run are basically candy bars in disguise, says nutritionist Christine Gerbstadt, MD, RD, a spokesperson for the American Dietetic Association. "Even though they may contain granola or fruit, some bars are full of high fructose corn syrup and trans fats to keep them soft and sweet," she says. A top-selling granola bar contains nearly the same amount of sugar—14 g—and fewer nutrients than a strawberry Pop-Tart or a slice of chocolate cake. A leading breakfast multigrain bar packs 15 g of sugar as well as heart-harming trans fats. "That rush of sugar will leave you feeling drained and hungry by midmorning," says Gerbstadt.