Diabetic patients will have the so-called “three more and one less” symptoms, some diabetics mistakenly believe that diabetes polyuria symptoms are caused by drinking too much water, and then deliberately control the amount of drinking water, so that although on the surface of the polyuria symptoms reduced, but the condition is aggravated. In fact, this is the case, diabetic patients drink more water, is a protective response to the body’s water loss, but also to improve blood flow, promote circulation, increase metabolism and eliminate ketone bodies and other effects. The hyperglycemic state of diabetics will stimulate the thirst center of the hypothalamus and cause thirst, and drinking water can make plasma osmolality drop or return to normal, thus playing a role in lowering blood sugar. In this case, if excessive restriction of water intake, it will lead to a reduction in blood volume, increase blood glucose, and also aggravate the hyperosmolar state, which is very unfavorable to the condition. Therefore, diabetics should not only not restrict water intake, but also drink more water appropriately. Of course, the fundamental method is to control blood sugar at the desired level now.