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Water: Our Essence
During the course of a day, a healthy adult can lose 8 to 10 cups of water -- and that's without hiking in the hot sun. We must keep replenishing our most important nutrient: water.
Water makes up about 75% of our muscles, brains, and blood. Though the plants and animals here are well adapted to a life with little moisture, humans react with serious symptoms after losing only 2% of our body's water. Total collapse occurs with only a 7% water loss. |