Epidemiological data reveal that the overall risk for kidney stones disease is lower for women compared to age-matched men. However, the beneficial effect for the female sex is lost upon menopause, a time corresponding to the onset of fall in estrogen levels.
The above is from a 2013 paper, Serum estradiol and testosterone levels in kidney stones disease with and without calcium oxalate components in naturally postmenopausal women.
The aim of this study was to look at serum estradiol and testosterone levels of naturally postmenopausal women who had kidney stones.
It was a small study with 113 naturally postmenopausal women with newly diagnosed kidney stones (some with calcium oxalate stones and some with non-calcium oxalate stones) and 84 controls, all around 52 to 62 years of age.
The results were as follows:
- Serum estradiol (E2) was significantly lower in kidney stones patients compared to controls (21.1 vs. 31.1 pg/ml)
- Serum testosterone (T) levels did not significantly differ among the groups.
The authors came to the conclusion that “Naturally postmenopausal women with higher remaining estradiol levels appear less likely to suffer from kidney calcium oxalate stones.
These findings support the hypothesis that higher postmenopausal endogenous [produced by the body] estrogens may protect against kidney stones with ageing.”
This is very encouraging research because it means we can do something about it (more on that below).
My question is this: What about increased dietary oxalate issues in this age group? And can there be similar issues in perimenopausal women too? This study only looked at kidney stones but I propose that there is a connection and that declining estradiol is the common factor. I also propose that providing estrogen support may help to counter both issues – kidney stones and/or dietary oxalate issues with no kidney stones, especially with the clinical observations and feedback I have had (more on that below).
Now this may not be the case for all women and is clearly not the only factor when it comes to kidney stones and dietary oxalate issues. But I do feel it needs to be part of the discussion. In menopause, osteoporosis and heart disease are on our radar but kidney stones and dietary oxalate issues are not.
Dr. Felice Gersch talks about estrogen and calcium in bone health and osteoporosis
I really thought I was onto something after hearing Dr. Felice Gersh, MD (a integrative gynecologist who focuses on women’s health and menopause) talk about estrogen and calcium in bone health/osteoporosis on The Osteoporosis Summit earlier this year. This is some of what she shared:
Estrogen affects everything! So estrogen is involved in the development of bone, but it’s even more complex. For example, estrogen allows the proper absorption of calcium, so that you get proper absorption of calcium from food in the gastrointestinal tract. That involves having proper estrogen levels. And having proper estrogen levels allows the reabsorption of calcium in the kidneys so that you don’t excrete a lot of calcium that you shouldn’t be excreting.
As soon as I heard calcium and the kidneys, the light bulbs went off and I started looking for some research. I didn’t expect there to be much because a higher incidence of kidney stones in menopause and the estrogen connection is not something I’ve heard discussed by menopause experts. However, the above study was one of many. Here are a few more studies that support this connection:
- Estrogen replacement increased the citrate and calcium excretion rates in postmenopausal women with recurrent urolithiasis (urolithiasis is kidney stone disease)
- Etiological role of estrogen status in renal stone formation
Interestingly this 2021 paper, Association between sex hormones and kidney stones: analysis of the National Health and Nutrition Examination Survey, reports that there is “no independent association between sex hormones (testosterone and estradiol) and history of kidney stones in either males or females.” This conclusion may be related to the fact that there are fewer studies that include women. I look forward to future research in this area and until then we use the other research and what we see clinically.
How common are dietary oxalate issues in my community of perimenopausal and menopausal women?
I posted the 2013 study and this question on Facebook to see how common an issue it is:
If you have dietary oxalate issues (with or without kidney stones) I’m curious if there is a hormonal connection and specifically if things got worse for you in perimenopause, and got really bad in menopause (as estrogen declines even further). This has certainly been the case for me.
Here is some of the feedback I’ve received on this post and related posts:
Cynthia shared this: “Really interesting! I definitely had oxalate issues (perimenopause) provoked by ruptured appendix/SBO/abscesses and fistula formation (13 day hospitalization)….I had to remove all oxalates and go full carnivore for 9 months….I’m still oxalate sensitive and had not been before…. I will definitely be sharing this with my communities….there are SO many middle aged women with oxalate issues”
Kirsten shared this: “Interesting to know. At the age of 49 (I am now 51), for the first time in my life I developed kidney stones – probably the most painful experience of my life. I eliminated vitamin C supplements and some oxalates (I had a daily dose of “green juice” that I was consuming as well that I no longer take) however I never understood the relationship between estrogen and their development. I am not post menopausal as of yet -but definitely experiencing symptoms common in peri-menopause… Perimenopausal symptoms include – anxiety (the worrying type) which is at its worst around the time I menstruate (taking 5-HTP which helps but doesn’t completely resolve), night sweats, hypoglycemia, HPA dysfunction (which could be a result of perimeno as well as its own issue – or both). If I don’t keep my stress levels in check, everything becomes exacerbated – meditation helps too.”
Leah shared this: I developed oxalate issues after menopause (I’m in my 60s) and didn’t realize what is was until I read your post about it during the early days of the pandemic when people were overdosing on vitamin C (at least you were trying to figure out if there was a connection at the time). With more research, I discovered a product called Kidney Cop that I still take (though I never get stones, only skin issues on my face). I also switched to liposomal vitamin C and amla and cut back on the offensive [high oxalate] foods for me. I do also experience a similar effect when I use collagen powder with peptides (skin issues). When I switched to a powder that didn’t contain peptides but has collagen types 1-5 in it, I had no issues. I don’t know if this is oxalate-related or not, but the skin issue is the same (clear fluid-filled bumps around my mouth and chin only).”
A number of women in the Facebook group Trying Low Oxlaates have shared comments like this: “I was never bothered by oxalate issues before menopause” and “I can tell you that my oxalate problems became far worse – along with everything else, pyroluria, copper toxicity etc – in perimenopause.”
Personally, my severe dietary oxalate issues started in 2012, when I was 52, and it manifested as excruciating foot pain. It was a combination of hot-burning-coals-pain and shards-of-glass-pain. Later it affected my left eye and more recently it impacted my sleep in a big way. I eat low oxalate and use vitamin B6 and calcium citrate (carefully timed) to keep symptoms away. My next plan is to see if addressing my low estrogen will help even more (more on that below).
Approaches to support declining estrogen levels in perimenopause and menopause
Briefly, here is a summary for supporting declining estrogen levels in perimenopause and menopause:
- Diet and lifestyle including exercise and stress-reduction
- Amino acid support as needed (GABA supports progesterone and tryptophan supports estrogen) and the pyroluria protocol of zinc, vitamin B6 and evening primrose oil (more on this here)
- Adrenal support
- Essential oils such as geranium and rose otto and clary sage and other oils to help with anxiety and stress
- Liver and kidney support
- Avoiding environmental toxins, especially xenoestrogens (plastics, fragrances, pesticides etc) which bind to estrogen receptor sites
- Maca – the research on Femmenessence Maca-Pause for bone and cardio health is very encouraging and I suspect there may be benefits for dietary oxalate issues and kidney stones too (when there is a low estrogen trigger). I will be trying this approach and I’ll report back on what I find.
- Other herbal approaches for hormonal support: Black cohosh, red clover, dong quai (which, interestingly, are reno-protective too)
- Bioidentical hormone replacement therapy
This section deserves an entire blog post and is important to address over and above the mood issues, increased anxiety, compromised sleep, low libido, vaginal issues and hot flashes – because of the impacts for heart health, cognitive decline and bone health.
Kidney stones and dietary oxalate issues in men
This 2016 paper addresses kidney stones in males and makes the testosterone connection for men under 60 years of age: Possible role of elevated serum testosterone in pathogenesis of renal stone formation
Urolithiasis [kidney stones] occurs with greater frequency in males with incidences three times higher compared to females indicating some role played by androgens. Stone formation in renal tissues before puberty is similar between males and females, whereas greater frequency is seen in the third to the fourth decade of life when the levels of serum testosterone are also the highest in males.
With advancing age, the probability for stone formation also decreases as consistent with the decline in serum testosterone levels with more than 20% of healthy men over 60 years of age presenting with serum levels of hormone below the range for young men.
This paper does also support the menopausal estrogen connection I’ve mentioned above: “With females, the frequency for stone formation is considered more compared with premenopausal postulated mainly due to low estrogen levels.”
There is so mention of dietary oxalate issues but we do see this clinically.
My other resources on oxalates if this is new to you
This blog, Oxalate crystal disease, dietary oxalates and pain: the research & questions, came out of my quest for finding a medical explanation/term for my own pain caused by dietary oxalates and a desire to gain a better understanding for my clients who experience similar pain.
You can read an overview of oxalates, my pain issues with dietary oxalates, a deeper dive into the condition called oxalate crystal disease (with some of my insights and questions), and the autism and atherosclerosis research.
As I mentioned above, my severe dietary oxalate issues started in 2012 (when I was 52) and it manifested as excruciating foot pain. It was a combination of hot-burning-coals-pain and shards-of-glass-pain. Later it affected my left eye.
You can also read how oxalates can contribute to anxiety, sleep issues (this has been a more recent issue for me), headaches, fatigue and other symptoms.
When I did the research for this older blog I didn’t come across any studies related to menopause and estrogen levels.
I published this blog, Coronavirus and vitamin C for immune support: new pain or more severe pain due to oxalate issues?, to help folks identify the increase in different types of pain they were seeing as a result of using high dose vitamin C. This could be joint pain, eye pain, foot pain, vulvodynia, bladder issues, insomnia, gut pain, kidney pain, changes in thyroid health/labs, bone pain etc.
This blog, Vitamin C causes oxalate formation resulting in pain, anxiety, and insomnia (when there is a defect in ascorbic acid or oxalate metabolism)? is part 2 and reviews some of the research on vitamin C/ascorbic acid being a possible trigger for the formation of oxalates in certain instances.
I do mention the big disconnect that we see in this research is always the mention of kidney stones. The missing piece – in the research and in many articles – is that you can have issues with dietary oxalates when there is no kidney disease/no kidney stones. I propose similar logic for dietary oxalate issues in perimenopause and menopause with declining estrogen levels i.e. dietary oxalate issues with or without kidney stones.
If you’re in perimenopause or menopause have approaches for supporting estrogen (estradiol) made your dietary oxalate issues and/or kidney stones less severe? Please share what has helped and if you have both – dietary oxalate issues and kidney stones/kidney disease.
If you’re a younger woman and have dietary oxalate issues and kidney stones/kidney disease, have you noticed any hormonal connections?
If this doesn’t affect you personally, have you seen the benefits of supporting estrogen with your perimenopausal/menopausal female clients/patients who have dietary oxalate issues and kidney stones/kidney disease?
If you’re male and have had dietary oxalate issues and/or kidney stones have you found they get less severe as you get older and testosterone declines?
If you have questions please share them here too.