Three steps towards fewer kidney stones

Just three basic steps can help most stone formers prevent future stones. Making these changes can help reduce your chance of having another stone by at least 50%. As a bonus, these changes have other health benefits above and beyond preventing kidney stones. For example, staying well hydrated can also make your skin look healthier, improve your alertness, and help with weight loss.

Step one: Increase your regular water intake by one liter a day. This is equivalent to two tall glasses or two typical 500ml grocery store water bottles. (One liter = 4.2 8-oz glasses or 34 oz).

Why?: By increasing your fluid intake, you reduce the concentration of your urine, making it less likely for stones to form. In fact, in a randomized study of kidney stone patients, patients who drank enough additional water to make an additional liter of urine over patients who drank their normal amount of fluid were 50% less likely to form another stone in the next five years.


Step 2: Avoid too much salt in you diet. For the general healthy population, your total daily salt intake should be only 2300 mg a day, equivalent to a teaspoon of table salt.

Why?: A high sodium intake can increase the amount of calcium excreted in your urine and decrease urinary citrate, making it more likely that you will form another stone. In a clinical trial of kidney stone patients, those who were instructed to take a low salt and low protein intake were less likely to form another stone than those who were told to reduce their calcium intake.

Step 3: Eat more healthy foods such as fruits and vegetables and less meat. Most adults should eat only 5 to 6 oz of protein daily.

Why?: A high protein intake will increase your calcium, oxalate, and uric acid excretion in your urine. All of these things will make it more likely for you to form another stone.

Not sure how much food contains 2300 mg of salt or 6 oz of protein? We didn’t either at first. Our page on dietary prevention of stones can help. It contains food equivalences information that makes it easier to understand these amounts in terms of real world food. We also have a handout which summarizes this information:






19 Responses to Three steps towards fewer kidney stones

  1. Daulatkhan Pathan. says:

    yesterday only urologist by performig uretroscopy and lithostripsy removed two stones from my lower ureter. this is my third surgery. and the stent is still in. Many advised me not to eat things like tomato,brinjal,leafy vegetables like spinach ,milk etc can anybody guide me about the food to be avoded


  2. Brian says:

    Does anyone know if eating protein bars will cause stones?? I usually eat x2 30gram protein bars per day. I just had to have a stone surgically removed and a stent put in. (Stent is out now after 5 days). Just curious of thoughts. Thanks.


    Derrick your side will always be sore after passing a stone as it cuts you up when passing. You may also be experiencing kidney colic.


    Hate predictive text. Just read what I wrote…should be ureter not jester! Geez.


    I have had stones since I was 37 & my first one was 12 x 12 mm. I have had surgery 2can a year EVERY year. My last one in April was so big it got stuck crowning my jester trying to pass. Surgery was painful-couldn’t be retrieved &Dr had to laser out. I have tried to change diet drink 1 1/2 gallons of water per day. I have Medullary soon get kidneys & my Dr says I have to deal with this till I die. The stress & anxiety waiting for yet another to drop is awful!!!

  6. Tara says:

    I have not found any prevention measures that help me so far. I have tried everything. I have even completely changed my diet and lost 50lbs. I am still suffering from these evil little things. In October of 2012, I had an 8mm removed via lithotripsy. Everything was going good until March of 2013. I passed a 3mm and two weeks later a 6mm was found via ct scan. I had the 6mm removed on June 4th 2013. I am currently passing a 3 mm. I really wish these things would go away!!!

  7. Roseann says:

    I had a large kidney stone removed surgically in April. Had a stent in for two weeks and it was removed in my doctor’s office at the post surgical follow up visit. No pain at all since then. Only thing now is that I have edema in my ankles and fingers, which I never had before the surgery. There’s no blockage, my blood and urine tests came back perfect. No kidney problems at all. My blood pressure is normal and no heart problems. I’m in good shape except for this edema. My husband thinks it’s toxins after surgery that need to be flushed out. Does anyone else have this? I’d appreciate any feedback.

  8. Chris says:

    Hi,great site to read over whilst in hospital! Helped me a lot ..
    I’ve had 2 stents removed this week (4 days ago) have a kidney and bladder full of stones
    Largest one is 12 mm x 10 mm ( wow) how will that ever pass?!?!

    Q-why is the blood plus drops of urine and some yellow gunk dripping out my penis still?
    As I am lying here in bed it keeps happening,?

    Does anyone know?

    Also-does cranberry juice really help?

    Any help is a help!

    • Carolyn says:

      Chris I had the same thing, only I’m female. I noticed that blood droplets with what seemed to be clear pus in my strainer. It’s amazing how your body can treat you sometimes. (yuck)!

    • I suffer from calcium oxalate stones as a result of medullary sponge kidney (MSK). In my case, I have found that cranberry juice causes more stones, which is likely due to the high oxalate level (13.2mg per 8 oz). I used to drink a lot of cranberry juice and it only aggravated things.

      I tried it a number of times when I had some very painful stones and it only made it worse. Water with lemon is a good thing for me, as it has the potassium citrate that helps prevent stone formation.

      I hope that helps!

  9. I had a stent put in yesterday because the stone I have is 1CM. Biggest one yet.
    I never want to go through the pain of having a stent put in again, so i will begin to
    do what I should have been doing over the yrs, drinking more water, less salt.

  10. lalita lenka says:

    my daughter is twelve months pregant she has been ditected with mutiple kidney stones can u help me to what i can do and please also tell me what she should eat and what not we are indian non veg pople

  11. larry kelley says:

    merry christmas, i just passed my 3mm stone @ 940;am 12/19/12 what a presant that was good luck with all you holders drink a lot of water & cranberry juice. wish all a merry christ & a happy new year. larry from milford oh.

  12. larry kelley says:

    merry christmas, i just passed my 3mm stone on 940;am 12/19/12 what a presant that was good luck with all you holders drink a lot of water & cranberry juice

  13. derrock says:

    i found i had a 7 mm kidney stone, and i get afflicting oppinions from different doctors, some says it small other says its big. i think i passed it ,i i saw something in my strainer. brown but im stil waiing for the results after passing should your side be sore

  14. Daniel Landry says:


    I hope you’re feeling better. I had a kidney stent removed on June 14th and had to keep the lortab handy as I was having severe muscle spasms for two days afterwards. I didn’t have any of the symptoms you’re describing, but I definitely sympathize with you. Did the doctor comment on the symptoms?


  15. Daniel Vallejo says:

    had a kidney stent, removed about a week ago, having sinus problems, burning feeling little stomach pain, little back pain,it’s the normal.

    • Daniel Vallejo says:

      had a kidney stent removed about a week ago, feeling bloated, little back pain, sinus problem, warm burning in my stomach.

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