Ohio State University scientists recently studied the effects of three popular energy bars containing varying amounts of carbohydrates—low, moderate, and high—on blood glucose in 20 people. Compared with the effects of white bread, blood-glucose levels were 71 percent lower after an Atkins Advantage Bar, 50 percent lower after a Balance Bar, and just 4 percent lower after a PowerBar.

If you want a convenient snack, avoid most breakfast, cereal, and “performance” bars—they’re full of sugar. Instead, choose a product like Atkins Advantage, which contains just 21 grams (g) of carbohydrates.