Do you know what's in your energy bar?

Choosing the wrong packaged meal can ruin your workout and your waistline.

All hail the energy bar — the seemingly sinless, slip-into-your-bag nutritional savior. The right bars can increase energy, fuel a workout and help muscles recover more efficiently. The only problem? The wrong ones are so loaded with excess calories and sugar, they’re basically supped-up candy bars. "As a rule, look for a bar between 100 and 200 calories that has 10 grams of protein to keep you full for two or three hours," says Georgie Fear, RD, of Precision Nutrition. For Fear's top picks for any bar-worthy situation, click through the slideshow above.

Want more pre and post-workout snack ideas? Check out our chart.

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