According to research published in the Journal of Renal Nutrition (USA), drinking warm water before bed helps increase blood flow to the kidneys while sleeping, thereby helping the kidneys maintain the process of filtering and excreting uric acid overnight.
Warm water helps dilate blood vessels gently, stimulate fluid circulation and dilute urine, an important factor in reducing crystallization of urate crystals that cause stones.
Experts at the National Kidney Foundation (NKF) emphasize that lack of water while sleeping is a common cause of high uric acid in the morning.
When the body is dehydrated, urate levels in the blood and urine increase, creating conditions for urate salt to deposit in the joints or kidney canal. Drinking 200-250 ml of warm water before bed helps maintain blood thinning, prevent fluid concentration and protect the urinary system.
The kidneys not only filter the blood but also regulate electrolyte balance and pH in the body. The World Health Organization (WHO, 2023) said that maintaining a stable water level for 24 hours has a positive impact on the rate of renal plaque filtering (GFR).
Warm water also helps maintain stable body temperature during sleep, reducing stress on the sympathetic nervous system, which can constrict kidney vessels and reduce renal blood flow.
When the kidney is dilated, the ability to filter and excrete waste (including uric acid) is significantly improved.
In addition to the effect of filtering blood, warm water also helps reduce oxidative stress, one of the causes of kidney cell damage.
When combined with a diet rich in green vegetables, low in animal protein and limited alcohol, the habit of drinking warm water before bed helps the body eliminate toxins more easily, while reducing the risk of urate crystalline formation in the kidneys, a trigger for gout and kidney stones.
Experts recommend drinking about 200-250 ml of warm water (37-40°C) 15-30 minutes before going to bed.
Warm temperatures help the body absorb easily without causing too much belly cold or urination. People with chronic heart and kidney disease or taking diuretic drugs should consult a doctor to adjust the appropriate amount of water to avoid waterlogging.
If you combine a few drops of lemon or sliced fresh ginger, warm water also helps balance the slight alkalinity, supporting more effective uric acid neutralization.
