The human brain is 75% water - moderate dehydration can cause headaches and dizziness Blood is 92% water. Muscles are 75 % water Bones are 22% water Water is vital for body temperature regulation, therefore fluid replacement is vital. During summer when the temperature increases, your body requires even more fluid to maintain it's normal body temperature. 1-5% Thirst, vagueness. Discomfort, increased pulse, nausea 6-10% ...more »
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