ST. LOUIS (KMOX) -  Have you heard about those new caffeinated potato chips designed to boost your energy levels?

If you’re thinking about trying them, or already have, a St.Louis-area dietician has a warning for you.

Jessica Sandfort, registered dietician for Barnes Jewish hospital, says Arma Energy chips contain 70 mg of caffeine and 190 calories…per 2-ounce bag.

“Just be aware of where your caffeine is coming from and how much you’re having,” Sandfort tells KMOX News Health Editor Fred Bodimer. “Two-hundred-fifty to three-hundred milligrams of caffeine per day is where I would say try to limit yourself to, because that’s when you start getting the side effects like a rapid heart, or arrhythmia, and sleep disturbances.”

She explains that 70 mg of caffeine is about the same as an espresso shot…not that much of an energy jolt.

But Sandfort goes on to say that you still need to be aware of how much caffeine you’re putting into your body on a daily basis, and also notes that these chips are NOT recommended for children or pregnant women.