Health Advice



Mayo Clinic Q And A: reducing your risk of kidney stones

From Mayo Clinic News Network, Mayo Clinic News Network on

Published in Health & Fitness

Dear Mayo Clinic: My father has a history of kidney stones. He has changed his diet in the past year, which seemed to help. I'm concerned though, since I had heard kidney stones can increase during the summer. Is this true? If so, are there any tips for how he can further reduce his risk?

Answer: As temperatures rise during the summer months, so does the risk of developing kidney stones, even if you have never had one before. There are several reasons why there is a rise in kidney stones during the summer months. Among these reasons are an increase in outdoor activities, and the amount and types of food and drink we consume.

Research shows that as the weather warms up, people spend more time outdoors, doing yardwork, spending time at the pool or around a barbeque. And often the body is not getting the type of fluids it needs while losing more than normal via the skin.

Kidney stones are hard deposits of minerals and salts that form inside your kidneys. They develop when your urine contains more crystal-forming substances, such as calcium, oxalate and uric acid, than the fluid in your urine can dilute.

There are several causes for kidney stones, including diet, which can play a significant role in the formation of kidney stones. A family or personal history of kidney stones raises your risk, as do certain medications and medical conditions.

Diseases and conditions may increase the risk of kidney stones include inflammatory bowel disease, chronic diarrhea, renal tubular acidosis, liver disease, cystinuria, hyperparathyroidism and urinary tract infections. High body mass index, large waist size and weight gain also are associated with kidney stones. Having gastric bypass surgery and taking certain medications can raise your risk, too.


One of the most straightforward ways to lower kidney stone risk is to drink plenty of fluids, water in particular. Extra fluids dilute urine, making stones less likely. During the summer months, it is important to drink plenty of water to prevent dehydration. But consuming lots of liquid in the heat of summer can lower your risk for developing kidney stones, as well.

Typically this equates to drinking about eight to 10 glasses of water a day, which should allow for you to pass approximately 21/2 liters of urine per day. One way to gauge whether you have adequate fluid intake is to check the appearance of your urine. If it's light or clear, you're likely drinking enough fluids. Avoid too many sugar sweetened beverages or colas as these can increase the risk. Added sodium in sports drinks and an excess of calcium also can increase your risk for stones.

The amount of salt in your diet makes a difference, too. Taking in too much salt increases the amount of calcium your kidneys have to filter, and that raises your risk of kidney stones.

Many foods that are popular during the summer, including processed foods and meats like hamburgers and hot dogs, which are laden with sodium and nitrates, also can affect your risk for kidney stones. Reducing the amount of salt in your diet may lower the risk of stones.


swipe to next page