Your Body Is Mostly Water — But What Is That Water Holding? Here is a number worth sitting with: 60 to 70 percent of your body is water. Your brain is roughly 75 percent water. Your blood is about 83 percent. Water is not just something you drink — it is the medium through which virtually every biological and energetic process in your body takes place. So here is the question that changes everything: what if that water is storing more than you think? Researchers exploring the