Home Dairy A dietician's prescription for kidney stones, what do you think?

A dietician's prescription for kidney stones, what do you think?


This is a case study, still not solved completely yet, a person on my life, not a client.

The case in hand, a 54 year old male. A fairly healthy person, on no medications, to date no abnormal blood tests (except slightly high LDL and total cholesterol), fit, eating a close to a paleo diet, low gluten rather than no gluten, i.e maybe a small serve of bread every couple of days. Eats some dairy – cheese and milk.  Drinks about 300 mls wine a day. Earlier this year cut down on carbs to lose a little weight, about 10 lbs. Eats approx 1.8 g per kg protein per day and about 50 grams carbs. He also drinks a lot of sparkling water, 2 -3 espresso shots a day and several cups of tea. Takes a multivite, that includes anti-oxidants, a good quality omega 3 about 1000mg day, and sometimes takes vit C (Ester C and bioflavanoids). Prior to May 2010 he took about 2000iu per day vitamin D per day, In May 2010 his blood test showed Vit D (25 Hydroxy) was 95nmol/L (38ng/l if you are in the USA). He increased vit D to about 4 – 5Kiu per day after that.

In April, May this year, complains of feeling tired, constipated, headaches. Not quite feeling his best. Doctor recommends lactulose for constipation. I wonder if he is eating too few carbs. (See Paul Jaminet’s series on problems with low carb diets, this post on constipation). I suggested he increase starchy carbs – root veggies. About a month later he got pain in his kidney area and rusty colour in urine a day later. I suggest he gets checked for kidney stones, stop the vitamin D, and get his vit D and calcium levels measured.

I was concerned that he may be absorbing too much calcium, as a result of too high a vitamin D level. Other bloggers have posted about this for example Jenny on Diabetes Update in this post “Too much calcium and vitamin D => Trouble” She writes about a condition called “Milk Alkali Syndrome” and her experience with it after increasing her vitamin D… ‘caused by the combination of high calcium and high Vitamin D and that the recent spike in cases has been caused by the recent fad of people supplementing with high levels of Vitamin D.’  (‘Calcium supplements can increase risk of kidney failure‘)

And from Dr William Davis: “Here’s a curious observation I’ve now witnessed a number of times: Some people who supplement this (1200mg day) dose of calcium while also supplementing vitamin D sufficient to increase 25-hydroxy vitamin D blood levels to 60-70 ng/ml develop abnormally high levels of blood calcium, hypercalcemia.” (‘Increased Blood Calcium and vitamin D’)

Paul Jaminet also writes in this post “Some people over-do vitamin D supplementation and/or calcium supplementation. Elevated blood calcium levels, which can be brought about by too much vitamin D, will cause constipation. If you supplement either vitamin D or calcium and have constipation, ask your doctor to check serum 25OHD, 1,25D, and calcium levels.”

I also wondered if the kidney stone was a result of his low carb diet Dangers of Zero carb diets: Kidney Stones (although at 50 – 80 g per day – his is not a Zero carb diet)

Then perhaps it is a genetic issue, as his father also once had a kidney stone. (Perhaps exacerbated by the increased vitamin D?)

Test results: D3 test 126nmol/L (50ng/L if you live in the USA). Urine test shows high calcium – 12.9mmol/collection (2.5 – 7.5) and a high volume (4 litres)

Sent to endocrinologist, who does further tests, for hyperparathyroidism (negative) wonders about diabetes insipidus, (negative). Measures serum calcium and phosphate (normal) Urinary osmolality, urea, oxalate and citrate (normal). Blood pressure 110/70. Ultrasound showed no kidney stones.

His verdict: long term vitamin D supplementation leading to hypercalciuria, and sends him to a dietician for advice on eating to reduce the risk of kidney stones.

Here’s the dietician’s advice:

Continue with high fluid intake, to keep urine dilute. (Drinks suggested: water, low sugar drinks e.g. diet cordial and soft drinks, milk – to achieve adequate calcium, tea, coffee, dilute fruit juice, moderate beer and win, BUT don’t drink sugary drinks)

Reduce sodium intake: “Getting sodium intake low enough can reduce the amount of calcium in your urine”. She noted he usually eats out at lunch, and suggested low sodium food choices, avoid added salt, sauces, and processed foods.

Ensure RDI of calcium – calcium bonds with oxalate from food and keeps it entering the blood, then urinary tract. Include dairy in diet rather than a supplement.

Moderate animal protein – too much animal protein increases calcium and lowers citrate in urine. Smaller portions 120g or less, eat less meat, eat legumes instead.

Eat high fibre foods as they contain phytate which binds with calcium and oxalate so you absorb less, which reduces stone formation. Choose wholegrain bread, pasta and cereal products, use wholemeal flour in baking.

Don’t take vit C or D as they may increase stone formation. Vitamin C is ascorbic acid and can be turned into oxalate by the body.

I asked the dietician a few questions:

If phytate binds to calcium, won’t it also bind to other minerals like zinc and cause deficiences? Her answer “He should be getting plenty of minerals from dietary sources”

Can you give me some evidence that vitamin C increases the risk of kidney stones? “Sure I’ll email you that” Consequently emailed various studies showing vit C increased kidney stone risk.

What about Vitamin K2, would it be useful to take? “I don’t know, I’ll ask the senior dietician, I haven’t heard anything about it” She later emailed that she knew of no benefit in taking K2

The Dietician’s sample meal plan and fluid guide:

Glass of water
High fibre cereal with milk or yoghurt, 1 cup
wholegrain toast and margarine
tea with milk
Morning snack
Bran muffin and coffee
2 eggs / 120 grams chicken or meat with salad in a sandwich or roll (wholemeal)
Fresh fruit and yoghurt
glass of milk or pottle yoghurt
Afternoon snack
Fruit with glass of water
Pre-dinner drink – diet lemonade
120 grams meat / fish / chicken – palm size serve
large serve vegetables
Lite tinned fruit and scoop icecream
glass of diluted fruit juice
Supper snack
Bran biscuit
glass of milk
glass of water

MEAL plan provides: 11 cups fluid, lower sodium foods, 4 serves high calcium foods, 2 serves meat, and high fibre foods.

What do you think? What would you do if this were you?
(In a few days – I’ll post what he is doing, after advice from alternative paleo friendly sources.)

Here is an interesting post to read in the meantime:

Tufts University Confirms That Vitamin A Protects Against Vitamin D Toxicity by Curbing Excess Production of Vitamin K-Dependent Proteins

Is Vitamin D Safe? Still Depends on Vitamins A and K! Testimonials and a Human Study

Are Some People Pushing Their Vitamin D Levels Too High?


  1. my husband had a lot of these same symptoms including the kidney stones. It turns out these can all be indicative of one (or more of the parathyroid glands failing). He had 1 of his 4 parathyroid glands removed—which was a fairly quick and simple surgery—the only thing he had to take post-op was calcium supplements. No recurrence of kidney stones at all. the tired feeling and wacky calcium results all went away post-op

    • Thanks for sharing your husband’s experience. Great to hear the surgery sorted it out.
      Problems with the parathyroid gland (hyperparathyroidism) was a possibility here too – but he came up negative on that.
      His symptoms started to go away when he stopped the vitamin D

  2. The whole Vitamin D / Calcium / Parathyroid / Kidney connection is under-investigated and in my not so humble opinion I don’t trust it a bit anyway. Especially if you take nutrition into account. There is a lot of bad information flying about and I especially don’t trust any casautions. Do high PTH levels lead to high calcium levels? Or the other way around?

    And what food does what? As far as I know, milk lowers calcium, contrary to popular believe. But first of all I am not sure and secondly you get a lot of other stuff with milk you might not want.

    For me, in my personal n-1 Vitamin D increased the fatigue I already had. My Parathyroid-hormone was high, but I measured it after I started taking Vitamin D. Don’t know about my calcium levels, or the other electrolytes for that matter.

    What I am doing at the moment:
    – I ditched all cereal
    – I ditched all milk products
    – I ditched all Vitamin supplements
    – I ditched almost all processed food (Some bacon being the exception)
    – While I eat a lot of animal products, I try to eat half of the foods weight as vegetable
    – If I start eating carbs, I gain weight. I can eat potatoes once a week, or maybe a fruit a day, but if I eat more, the weight goes up.
    – I use salt to taste

    Next thing for me is to check my blood-electrolytes, if possible all.

    My personal n-1 at this moment, so take some grains of salt with it.

  3. Unless you know the composition of the stone, then it is hard to determine the cause. However, if the stone has passed without catching it, then it cannot be analyzed. One can only try to eat and live the best way possible. I would do very low carb paleo dieting, because insulin can cause reabsorption of some chemicals, including uric acid, by the kidney. Even though blood uric acid levels may be normal, the stones could be uric acid stones. Stay well hydrated during exercise. Try to get most of vitamin D by sun exposure. If uric acid is the problem, avoid fructose and alcohol. Stay away from the grains.

    • The stone wasn’t caught, but it was likely calcium oxalate according to the Doctor, calcium was the only contributor that was high in urine.
      I would hesitate to be very low carb in this case, as he has been on a moderate carb diet for many years and has no sign of metabolic issues, in this case I don’t think it is necessary. Also when one goes low carb, protein tends to increase, and this is best to be moderate when one has high urinary calcium.
      Agreed on your other points.

  4. I’m surprised the dietitian didn’t mention citrate, eg lemon juice. That’s much better attested than the other recommendations.

    Vitamin C can either hurt or help, but glutathione definitely helps, as does CoQ10, I discussed this in my kidney stones post.

    • Hi Paul,
      Thanks, yes, sorry I left this out: I should have mentioned – the Endo did tell him to take lemon juice, however it depended on his his urinary citrate levels, as to whether this was necessary. His citrate measurement was very good – so he said it wasn’t necessary. He was taking magnesium citrate though.

      (Lemon juice was also on the dietcian’s list of things to do for kidney stones.)

      I will update shortly with what is is doing.

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