Not only is optimal hydration key to life, but it can also affect physical appearance.
Too much fluid and you can appear bloated and swollen, too little and your skin can appear cracked and wrinkled. Beneath the skin, water is involved in almost every chemical process in the body. Disruption of this delicate balance can result in poor health consequences and psychological imbalance both of which can then further affect outward projection of vitality.
Therefore, the age-old saying is true, that to shine on the outside, you have to be balanced on the inside.