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Diet for kidney stone prevention
Posted on Dec 31, 2015
Kidney stones can form when substances in the urine - such as calcium, oxalate, and phosphorus - become highly concentrated. The body uses food for energy and tissue repair. After the body uses what it needs, waste products in the bloodstream are carried to the kidneys and excreted as urine. Diet is one of several factors that can promote or inhibit kidney stone formation. Certain foods may promote stone formation in people who are susceptible, but researchers do not believe that eating any specific food causes stones to form in people who are not susceptible. Other factors that affect kidney stone formation include genes, environment, body weight, and fluid intake.

Major types of kidney stones

  • Calcium stones are the most common type of kidney stone and occur in two major forms: calcium oxalate and calcium phosphate. Calcium oxalate stones are more common. Calcium oxalate stone formation may be caused by high calcium and high oxalate excretion. Calcium phosphate stones are caused by the combination of high urine calcium and alkaline urine, meaning the urine has a high pH.
  • Uric acid stones form when the urine is persistently acidic. A diet rich in purines - substances found in animal protein such as meats, fish, and shellfish - may increase uric acid in urine. If uric acid becomes concentrated in the urine, it can settle and form a stone by itself or along with calcium.
  • Struvite stones result from kidney infections. Eliminating infected stones from the urinary tract and staying infection-free can prevent more struvite stones.
  • Cystine stones result from a genetic disorder that causes cystine to leak through the kidneys and into the urine, forming crystals that tend to accumulate into stones.

Dietary changes to help prevent kidney stones

People can help prevent kidney stones by making changes in fluid intake and, depending on the type of kidney stone, changes in consumption of sodium, animal protein, calcium, and oxalate.

Drinking enough fluids each day is the best way to help prevent most types of kidney stones. Health care providers recommend that a person drink 2 to 3 litres of fluid a day. People with cystine stones may need to drink even more. Though water is best, other fluids may also help prevent kidney stones, such as citrus drinks.

Recommendations based on the specific type of kidney stone include the following:

Calcium Oxalate Stones
  • Reducing sodium
  • Reducing animal protein, such as meat, eggs, and fish
  • Getting enough calcium from food or taking calcium supplements with food
  • Avoiding foods high in oxalate, such as spinach, rhubarb, nuts, and wheat bran

Calcium Phosphate Stones
  • Reducing sodium
  • Reducing animal protein
  • Getting enough calcium from food or taking calcium supplements with food

Uric Acid Stones
  • Limiting animal protein

How much fluid should a person drink to prevent kidney stone formation?

People who have had a kidney stone should drink enough water and other fluids to produce at least 2 litres of urine a day. People who have had cystine stones may need to drink even more. The amount of fluid each person needs to drink depends on the weather and the person’s activity level - people who work or exercise in hot weather need more fluid to replace the fluid they lose through sweat. A 24-hour urine collection may be used to determine the volume of urine produced during a day. If the volume of urine produced is too low, the person can be advised to increase fluid intake. Drinking enough fluid is the most important thing a person can do to prevent kidney stones. Some studies suggest citrus drinks like lemonade and orange juice protect against kidney stones because they contain citrate, which stops crystals from growing into stones.

What diet should a person follow to prevent future kidney stones?

A dietician can help a person plan meals that lower the risk of forming stones based on the type of stone the person formed in the past. A person with a history of kidney stones may want to talk to a dietician who specializes in kidney stone prevention or nutrition for people with kidney problems.

A dietician can also help overweight people plan meals to help them lose weight. Studies have shown that being overweight increases the risk of kidney stones, particularly uric acid stones. Diets that are low in carbohydrates have been shown to further increase the risk of uric acid stones and should be avoided.
Written by : Lazoi Team
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