Energy drinks have become a very popular source for so-called energy, especially among kids. They believe that by drinking these energy supplements, they will easily gain the necessary boost to perform well in a sporting event or to stay up late to study. But they contain little sugar. They also contain less caffeine then the smallest cup of Starbucks coffee. In reality, they only give you a short quick boost of energy. Drinking energy drinks can easily give you stomach pains very easily. Finally, liquid-based energy supplements can actually help you gain weight.