Drinking a moderate amount of water in the morning on an empty stomach can replenish the water needed by the body and reduce blood viscosity at the same time. Getting up in the morning on an empty stomach to drink a moderate amount of water can supplement the body’s need for water at the same time to reduce blood viscosity, because sleep occurs hidden sweating and urinary secretion, will lose a relatively large amount of water, easy to cause the blood viscosity increases, get up and drink water to increase the body’s water to increase the volume of circulating blood, which reduces the viscosity of the blood, is conducive to physical health. If there is renal insufficiency or cardiac insufficiency people, should control the amount of water to drink, the amount is too much, may be due to renal insufficiency and water retention or due to cardiac insufficiency and increase the burden on the heart, may aggravate the condition.