70% of your body is water. So that cares care of a large bit of the problem. Other fluids can be increased by consuming electrolytes which are lost when we work out. As for blood and spleen the body will naturally develop more as time passes.
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The loss of body fluids helps dispel toxins through the skin pores. Excessive loss can be dangerous as in the case of excessive urine production or sweat or vomiting. Medical professionals should be consulted in extreme cases.