#GALLONCHALLENGE ________________________________________ Up to 60% of the human adult body is water. According to H.H. Mitchell, Journal of Biological Chemistry 158, the brain and heart are composed of 73% water, and the lungs are about 83% water. The skin contains 64% water, muscles and kidneys are 79%, and even the bones are watery: 31%. ________________________________________ Those are facts. 💯 Ladies, if your skin is the largest organ system of the body and is compromised of up to 64% of water, why are you not drinking it daily? Before you go spend hundreds of dollars on facial treatments, try drinking a gallon a day for just a week and see what happens..