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FALSE:::::::: Up to 60 percent of the human body is water, the brain is composed of 70 percent water, and the lungs are nearly 90 percent water. About 83 percent of our blood is water, which helps digest our food, transport waste, and control body temperature. Each day humans must replace 2.4 litres of water, some through drinking and the rest taken by the body from the foods eaten.
This healthy body water percentage chart will help you determine if you have enough water in your system. Many scales will tell you this value in seconds. Because your fat in your body has a lot of water in it, you have to first know how much fat you have in your body before you can then figure out what your healthy water content is. That is, if you say have 33% fat in your body, then you only need another 37% of water alone, because you have water in the fat. The scales don't count fat water as water, otherwise your numbers would get very confusing :)