1) Energy drinks have two key ingredients, one is sugar, and they have lots of it! What we call sugar is the disaccharide sucrose, which is composed...

1)  Energy drinks have two key ingredients, one is sugar, and they have lots of it! What we call sugar is the disaccharide sucrose, which is composed of glucose and fructose. The other component is some sort of metabolism stimulant, like caffeine. Do energy drinks really provide energy? If so, how?