Energy drinks are simply soft drinks which are marketed to be as those drinks boosting up the energy when compared to other ordinary drinks. The usual calorie count or the quantitative energy is estimated to be much lesser than those found in normal soft drinks. The major ingredients present in these energy drinks are a blend of Vitamin B complex, herbal constituents and methylxanthines including caffeine.
A variety of physiological and psychological effects attributed to energy drinks and/or their ingredients have not been investigated. However two studies reported significant improvements in mental and cognitive performances as well as subjective alertness. Reports and research show that many people are inclined to take a high energy drink first thing in the morning, even before their breakfast.