Diuretics remove fluids from the body through urination. They help rid the system of excess water and toxins and are often used in the form of prescription drugs or over-the- counter medications. But there are natural diuretics that achieve the same effect, and some people believe they work better. Natural diuretics are food or herbs that stimulate the kidneys to produce more urine and thereby help in removal of excess fluids and flushing out toxins from the body.