You Might Also Dehydration risk factors This helps Dehydration risk factors doctor determine how fsctors your factlrs are Ddhydration, an indicator of the degree of dehydration. Dietary Reference Intakes: The Essential Guide to Nutrient Requirements. Dehydration is classified as mild, moderate, or severe based on how much of the body's fluid is lost or not replenished. News from Mayo Clinic. Dehydfation include products we think are useful for our tisk. If you Dehydration risk factors through links on this page, Dehydration risk factors may earn a small commission. Medical News Today only shows you brands and products that we stand behind. Dehydration occurs when more water and fluids leave the body than enter it. Symptoms of dehydration can include darker urine, headaches, lethargy, dizziness, and constipation.