Water is a little known metabolic accelerator that actually keeps one awake more efficiently and with a greater mental alertness/clarity than any caffeine product. Although the effective volume dosage is greater, there are no adverse effects such as the shakes or the 6 hour delayed adenosine crash. At these stimulating levels, water also begins to burn body fat due to a number of metabolic factors, one being a decrease in overall body temperature. The water should be ice-cold to maximize the effects.