i disagree, water is the second most important thing to the body.....what's first? oxygen. we can only live minutes without it. if this was not the case then we could live longer without water than food, but we all know that is not true. it's pretty simple, water is two parts hydrogen and 1 part oxygen, if you understand simple biology you will know that when your put more oxygen into your blood and blood cells they in turn distribute oxygen throughout your body giving it energy. this is why foods that are green in color by nature are better for you, and you must understand that leafy green vegetables by nature are low calorie but provide a significant amount of oxygen(energy) to the body.
you need to look at the source of energy that you give your body, if it's not natural to the body then it's not doing it well. your body is an energy bank, you want to put more energy deposits in it, and take less withdrawls.