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  • Writer's pictureDr. Karuturi Subrahmanyam

Does drinking more water damage your kidneys?


Water is essential for life, and it plays a vital role in keeping your kidneys healthy. Your kidneys are responsible for filtering your blood and removing waste products, excess fluids, and toxins from your body. They also help regulate your blood pressure, electrolyte balance, and red blood cell production. Drinking enough water helps your kidneys perform these functions efficiently and prevents dehydration, which can cause kidney damage.


However, drinking too much water can also have negative effects on your kidneys, especially if you have certain medical conditions or risk factors. In this article, we will explain how water intake affects your kidney health, and how much water you should drink to stay hydrated and avoid complications.


How does water intake affect kidney health?

Drinking water to aid hydration helps your kidneys perform better by removing metabolic wastes in the form of urine. Drinking more liquids also prevents the formation of kidney stones and the development of certain complications such as chronic kidney disease. Water helps dissolve the antibiotics used to treat urinary tract infections, making them more effective.

However, drinking too much water can also cause problems for your kidneys, such as:

  • Hyponatremia: This is a condition where the sodium level in your blood becomes too low due to excessive water intake. Sodium is an important electrolyte that helps maintain fluid balance, nerve function, and muscle contraction. When you drink too much water, you dilute the sodium concentration in your blood, which can cause symptoms such as confusion, headache, nausea, vomiting, seizures, coma, and even death.

  • Overhydration: This is a condition where you have excess fluid in your body due to excessive water intake or impaired kidney function. Overhydration can cause swelling (edema), high blood pressure, heart failure, and kidney damage.

  • Kidney failure: This is a condition where your kidneys lose their ability to filter your blood and remove waste products. Kidney failure can be caused by various factors, such as diabetes, high blood pressure, infections, drugs, toxins, or genetic disorders. Drinking too much water can worsen kidney failure by increasing the workload on your already damaged kidneys and causing fluid overload.


How much water should you drink for optimal kidney health?

There is no hard and fast rule that everyone needs 8 glasses of water a day. This is just a general recommendation based on the fact that we continually lose water from our bodies, and that we need adequate water intake to survive and optimal amounts to thrive. The amount of water you need depends on several factors, such as:

  • Your age: As you get older, your body loses some of its ability to sense thirst and conserve water. You may also have less muscle mass and more fat tissue, which affects your water balance. Therefore, older adults may need to drink more water than younger adults to stay hydrated.

  • Your climate: If you live in a hot or humid environment, you may lose more water through sweating and breathing. You may also need to drink more water to prevent heat-related illnesses such as heat stroke or heat exhaustion.

  • Your activity level: If you exercise regularly or engage in strenuous physical activities, you may lose more water through sweating and breathing. You may also need to drink more water to replenish the fluids and electrolytes you lose during exercise.

  • Your health status: If you have certain medical conditions or risk factors that affect your kidney function or fluid balance, you may need to adjust your water intake accordingly. For example, if you have diabetes, high blood pressure, heart disease, or kidney disease, you may need to drink less water than normal to avoid overhydration or fluid retention. On the other hand, if you have kidney stones, urinary tract infections, or dehydration, you may need to drink more water than normal to prevent complications.


The best way to determine how much water you need is to monitor your urine color and volume. Your urine should be light yellow or colorless and you should be making about 1.5 liters of urine daily (about 6 cups). If your urine is dark yellow or brown, this indicates that you are dehydrated and need to drink more water. If your urine is clear or very pale and you are urinating frequently or excessively, this indicates that you are overhydrated and need to drink less water.


You should also pay attention to other signs of dehydration or overhydration, such as thirst, dry mouth, fatigue, headache, dizziness, confusion, muscle cramps, swelling (edema), shortness of breath (dyspnea), chest pain (angina), or irregular heartbeat (arrhythmia).

If you have any questions or concerns about your water intake or kidney health, you should consult your doctor or a registered dietitian for personalized advice.


Summary

Water is essential for keeping your kidneys healthy, but drinking too much or too little can also harm them. The amount of water you need depends on various factors, such as your age, climate, activity level, and health status. You should monitor your urine color and volume, and other signs of dehydration or overhydration, to determine how much water you should drink for optimal kidney health. You should also consult your doctor or a registered dietitian for personalized advice.


Dr. Karuturi Subrahmanyam, MD, FRCP (London), FACP (USA)

Internal Medicine Specialist


Kify Hospital

Danavaipeta

Rajahmundry

Phone : 85000 23456


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