Fluids, Diet, and Meds for Common Stones

The most common kind of stone former has no systemic disease as a cause of stones – ‘idiopathic’ stone former means that. Being most common, their treatments rank highest for all physicians who treat stone formers.

These articles include the treatment trials.

This charming Kitchen Scene by Joachim Beuckelaer (1533 – 1573) is oil on wood panel and hangs in the Louvre. 


Patient Q&A page about fluids – Underused; we answer questions

How to drink enough water – Tips and day plans

How to get a variety of fluids – Which fluids cause which prevent stones

Fluid prescription for kidney stones – A serious article about how much you need

Does water prevent stones; What’s your bet? – The water trial, evidence fluids work

Web apps and smart bottles – A poll of users and list of what is available

The low flows People who do not like fluids

ACP Guidelines: Fluids – Defective review that can mislead physicians and patients

Kidney Stone Diet

What is it?

Three Essentials Out of the welter of the diet, three essential steps that do most of the work if used exactly right

Canary in the mine shaft – Stone forming may signal abnormal risk from diet for kidney, vascular and bone disease

Our diet promotes stones, bone disease and hypertension – What is wrong with what we eat

Something Special Women Do – Women selectively absorb alkali from their food, protecting themselves from acid loads

The kidney stone dietLess sodium and sugar, more calcium and potassium; control protein and oxalate

The science of the kidney stone dietThe Evidence behind the kidney stone diet

How to eat the kidney stone diet – Resources and links

Recipes for the kidney stone diet – A book of 31 recipes that accord with the diet requirements


How to lower diet sodium – How to achieve the kidney stone diet sodium intake

Control your salt for fewer stones and stronger bones – Importance of sodium reduction

Salt Detailed review of how sodium causes stones, bone disease, and hypertension

Case 3: A success story – How a wife and husband managed low sodium diet and hydration (for him)

Calcium protein and potassium

How to Eat a High Calcium Low Sodium Diet – How to achieve the kidney stone diet calcium intake

Diet protein and potassium  – Animal protein hardly raises stone risk unless extreme; veggies lower it

Does too much protein increase stones or damage bones? – Yes for stones, no for bones; how much to eat


Why eat a low oxalate diet? – When do you need to control diet oxalate

How to eat a low oxalate diet – How to control diet oxalate intake; oxalate lists


How to wean off sugar – Tips and alternatives

Science and politics of the US diet guidelines – Sugar scandals and the myth of the low fat diet

Against sugar – Gary Taubes’ reporting on the sugar scandal and sugar as poison

Consumer Reports Recommend Low Diet Sodium and Sugar – Experts recommend this

Sugar: The end of our love affair – My personal story about ending sugar addiction

More help

Food Q&A page – Questions answered 

Online education course reduces stone risk factors – Preliminary data from online diet education course

Kidney stone prevention course – Online course by Jill Harris to help with diet

Take charge of your kidney stone prevention – Inspirational and practical advice by Jill Harris


Thiazide diuretics for stone prevention – Types, how they work, how to use them, the trial data links

Citrate to prevent calcium and uric acid stones – The citrate trials

Price of potassium citrate – Ways around the over pricing scandal (check out comments)

How potassium citrate pills work – Deep biology of citrate

Citrate and the Ostwald limit – Highly technical science

Calcium binding by citrate – Highly technical science

Potassium citrate: The contributions of Dr. Charles Pak – Review of classic research papers

ACP Guidelines on Medications – Defective review that can mislead physicians and patients

Diet and Meds Together

Treatment of idiopathic calcium stones – All the trials, and diet, how to use them together: Key article

Chapter 5: Idiopathic calcium stones – A lighter version of the prior article

Chapter 6: Why delay prevention? – Even one stone is enough to begin diagnosis and treatment

An expert rebukes ACP guidelines – Defective guidelines need serious critics like this one


The coke treatment is uselessSeemingly without a reason to exist

12 Responses to “Fluids, Diet, and Meds for Common Stones”

  1. Jenny

    Dear Dr. Coe,
    Thank you so much for this blog. Your knowledge and effort are much appreciated! My mother passes a stone or two every 10 years or so, each time quite painful. When she found out they’re calcium stones, she actually avoided calcium intake for a long time (and I believe she was deficient to begin with although they never checked her!). I’ve added a couple of 200 mg calcium citrate tablets to her meals, and am thinking of adding in a bit of K citrate as well. What is your opinion on cranberries/cranberry extracts? I’ve read totally contradictory “research” on their roles on stone formation; some say they prevent formation and clears uric acid while others say they can promote growth. We also regularly consume foods like tahini (usually black whole seeds) and amaranth grains. I understand that these foods are relatively high in oxalates, but most of them are in insoluble calcium oxalate form. Am I correct to assume that most of this will not end up in the urine and cause issues? Thank you!

  2. Michael Fox

    Hi Dr. Coe,

    I am a calcium oxalate stone former (ideopathic/genetic hypercalcuria with high urine oxalate) and have a few questions regarding treatment/prevention over & above diet changes already in place:

    – as there seems reasonable support for the benefits of lemon juice by reputable sources (eg. https://www.uwhealth.org/files/uwhealth/docs/pdf/kidney_citric_acid.pdf), why do you abhor its use as a therapy?
    – would it be safe/effective to consume a low-dose of calcium citrate (eg. 100-200mg) with meals to help bind oxalate and inhibit absorption?
    – can potassium citrate therapy still be of benefit where there is no indication of hypocitraturia?
    – is consuming non-timed release potassium citrate supplements (eg. OTC, 4 x 99mg elemental K/tab = 10.12mEq) as safe/effective as timed-release (eg. Rx, 1 x 10mEq)?

    Thank you.

    • Fredric L Coe

      Hi Michael, Very astute questions. If your urine citrate is normal, I cannot imagine a reason to take citrate. As for lemons, they contain considerable citric acid but much of it is in the acid form – all proton acceptor sites protonated – so it will provide no new bicarbonate and therefore not raise urine citrate. The citric acid will be excreted unchanged in the urine or metabolized as such without benefit. Only the citrate – partially unprotonated citric acid – will provide new bicarbonate and raise urine citrate, but we already agreed this seems of no importance for you. As for reputable, no doubt, but exacting is another matter altogether. Lemons have a rather low pH, so their citrate is most the acid. I have never seen a reason to promote them for treatment. As for calcium supplements with meals, they will reduce urine oxalate – if it is high, but also raise urine calcium. The way to do this is complex: lower diet sodium and raise diet calcium. Here is the kidney stone diet. Regards, Fred Coe

      • Michael Fox

        If I understand correctly, high diet calcium will lower urine oxalate, and low diet sodium will control urine calcium. In that scenario, would not potassium citrate be better apt to lower urine calcium further and raise urine pH?. You say the consumption of calcium supplements with meals will raise urine calcium, but how do you distinguish this from calcium obtained via diet? In digestion, logic would suggest that the body cannot differentiate calcium ingested from diet vs. supplements (when consumed at meals), and therefore would not calcium from diet be just as apt to increase urine calcium which is counter to the intended goal? If calcium, irrespective of source, is intended to bind oxalate when taken at meals, is it not then excreted from the body thereby not impacting urine calcium? The intent with utilizing low-dose supplementation is to ensure the presence of calcium at meals where one cannot be certain of both the calcium content of the food consumed at that meal, nor the level of oxalate. Low dose calcium supplementation (eg. 150-200 mg) is meant to mimic/mirror amounts that might be found in food (eg. 1/2 cup milk = 150 mg), and would seem a reasonable strategy particularly where one may wish to avoid dairy products (which represent a large source of higher calcium foods), and/or where other high calcium foods may also concurrently be higher sources of oxalate (eg. leafy greens). Is this line of thinking flawed? Thank you.

        • Fredric L Coe

          Hi Michael, Calcium absorption by the intestines is regulated, so excess will not be absorbed into the blood. Using a TUM – 500 mg – with each meal that contains oxalate will lower oxalate absorption – we have data on that. Foods with calcium, like milk, will do as well; a glass of milk is 300 mg, a decent amount. Low diet sodium will reduce urine calcium no matter how much calcium is actually absorbed, and the extra calcium goes into bone. Regards, Fred Coe

  3. Kim Rogers

    Hi, My 13 year old son has been struggling with anxiety which lead us to consult with a nutrition specialist who recommended the Organic Acids Test – Nutritional and metabolic profile. This nutrition person just today referred to pediatrician for his oxalate levels. This OAT urine test revealed my son’s values of Glycolic 210 (Range 18-81), and Oxalic 232 (Range 8.9-67). He is generally healthy, no medication, just dietary supplements. He may be lactose intolerant and we have been avoiding dairy. Celiac negative. He has been underweight since he has been 4 years old. He weighs 70 lbs. I have been busy reading everything with your name on it and my question is how at risk are his kidneys ? What levels of oxalate determine hyperoxaluria? How do we safely get rid of this oxalate? I suspect it is diet related. We thought we were eating well but it turns out most of foods I now have discovered are high in oxalate. Regards, Kim

    • Fredric L Coe

      Hi Kim, If the lab is accurate and urine oxalate is really 232 mg/d, this needs to be corrected immediately. As you can guess, eliminate all high oxalate foods and recheck. If it is all diet, then the diet must be extreme in both low calcium and high oxalate because a value so high is beyond anything I have ever seen from diet alone. Move quickly! Regards, Fred Coe

  4. Katie Gorman

    Dr Coe

    I find your articles very informative and interesting, thank you. I am a calcium phosphate stone former and have type 1 renal tubular acidosis and medullary sponge kidney on both sides. In my 24hr urine tests despite being on potassium citrate I still show 0mg in a 24hr period. My nephrologist has told me to stop taking them as they aren’t working. I also take sodium bicarbonate but it has only been a month so do not yet know if it is effective. Do you have any advice for someone in my position? I drink 4L of water a day, low sodium and low animal protein as well. I feel a little discouraged as I currently have 12 stones between 3mm and 9mm. My last stone landed me in the hospital with sepsis for three weeks. Thank you for any advice you my offer.

    • Fredric L Coe

      Hi Katie, I gather you have both a high urine pH and low urine citrate AND low serum bicarbonate. If so, the many calcifications in your kidneys are not MSK but rather tubule plugging. MSK patients form calcium oxalate stones. If your blood bicarbonate is normal, then you just have CaP stones. If your urine calcium is over 150 mg, I would consider low sodium diet and even chlorthalidone to lower it along with ample potassium chloride so you do not get potassium depleted. Your physician is entirely responsible for your care, I have not seen your actual data, so all you can do with my comment is ask him/her if it is at all useful. Regards, Fred Coe

  5. t. jo

    Dear Dr. Coe, I’d like to try a stone breaker product (active ingredient is CHANCA PIEDRA) for my stones. What to you advise on this ingredient? My last stone breakdown was as follows.
    20% calcium oxalate monohydrate,
    60% calcium oxalate dihydrate, and
    20% calcium phosphate (hydroxy- and carbonate- apatite).
    Thanks so much.

    • Fredric Coe, MD

      Hi t.jo, I have read about this stuff and see little real evidence and a lot of hype. Your stone is not uncommon, and this stuff is promoted as a way to ‘dissolve’ them. I doubt it does anything but enrich the people who sell it. I have long meant to write about it, but it is a wearying thing to take on commercial stuff like this and show how mediocre the underlying data are. So negative a way to spend time! As for my advice, I know of no harm, and suspect it is without value. Regards, Fred Coe


Leave a Reply