Mayo Clinic Health Library

Are energy drinks bull?

Updated: 05-19-2011

Thanks to a large amount of sugar and caffeine, energy drinks might give you a temporary energy boost. But too much sugar from energy drinks can add extra pounds. And too much caffeine can cause adverse side effects, such as nervousness, stomach upset, irritability, increased heart rate and insomnia. Energy drinks aren't necessarily bad for your health. But there are better ways to boost your energy. Get enough sleep, exercise regularly and eat healthy foods.