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kidney stone — Integrative Kidney https://old.inkidney.com Integrative Approach to Kidney Health Thu, 14 Jul 2022 00:14:49 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://old.inkidney.com/wp-content/uploads/2020/01/Favicon.png kidney stone — Integrative Kidney https://old.inkidney.com 32 32 January Research and News https://old.inkidney.com/january-research-and-news/ Tue, 25 Jan 2022 17:00:12 +0000 https://old.inkidney.com/?p=3125 Happy New Year! We combed through multiple medical journals looking for the latest research on the Integrative approach to kidney health. We know your time is valuable so we curated and summarized these studies for you. Welcome to the January edition of InKidney Research and News. 3 years of lifestyle interventions improved exercise capacity and decreased the losses in...

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Happy New Year! We combed through multiple medical journals looking for the latest research on the Integrative approach to kidney health. We know your time is valuable so we curated and summarized these studies for you. Welcome to the January edition of InKidney Research and News.

January Research and News

3 years of lifestyle interventions improved exercise capacity and decreased the losses in neuromuscular and cardiorespiratory fitness in CKD patients

In this study, researchers randomized 161 patients with stage 3-4 CKD to either get usual care or usual care plus lifestyle “intervention” for 3 years.

The lifestyle intervention comprised of care from a multidisciplinary team, including a nephrologist, nurse practitioner, exercise physiologist, dietitian, diabetes educator, psychologist, and social worker.

The patients were coached for 8 weeks and then followed for 34 months with a home-based program.

The study did not look at the progression of CKD but it found that a 3-year lifestyle intervention doubled the percentage of CKD patients meeting physical activity guidelines, improved exercise capacity, and decreased the losses in neuromuscular and cardiorespiratory fitness.

It appears that the study mainly focused on exercise. So imagine the benefit of a comprehensive lifestyle modification plan that includes nutrition, exercise, stress management, sleep improvement, and attention to toxin exposure and gut-kidney connection. That’s what we focus on.

Read the study

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Curcumin powder did not improve markers of vascular dysfunction in PKD

This is essentially a negative study.

It demonstrated that Curcumin powder did not improve markers of vascular dysfunction in children and young adults with PKD. The study was conducted for only one year using a dose of 25 mg/kg per day of curcumin.

This is a classic supplement or nutrient study that is usually underpowered or conducted for short periods of time for a disease that takes years or even decades to evolve. Nevertheless, the study proved that short-term use of curcumin is not beneficial for vascular health for young patients with polycystic kidney disease.

Read the study



Low serum zinc levels were associated with infections in CKD patients

This did not really need research but it is now studied and it is official: Low zinc levels in patients with CKD lead to infection (..well among other things). 
This retrospective study analyzed data from 299 CKD patients who had serum zinc levels checked to evaluate anemia. They used the level of 50 mcg/dl as the cutoff between low or “high” zinc values.
Low serum zinc values remained an independent risk factor for infection-related hospitalization. This was especially true for patients taking proton pump inhibitors (PPIs) medications.
Read about the effect of Zinc on kidney health in this blog.

Read the study

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We would love to here your feedback. Let us know what you think of these educational materials and if you like us to focus on certain topics. Email us at info@inkidney.com

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Magnesium Deficiency: Assessment and Management for Better Kidney Health https://old.inkidney.com/magnesium-deficiency-assessment-and-management-for-better-kidney-health/ Wed, 05 Jan 2022 17:00:33 +0000 https://old.inkidney.com/?p=3119 In part one of this article, “Magnesium and Kidneys,” I discussed the increased prevalence of magnesium deficiency and addressed the question: “Can magnesium help kidney function?” Magnesium is the fourth most abundant mineral in the body. It is essential for many biological functions. As I discussed in part one, magnesium is also crucial for kidney...

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In part one of this article, “Magnesium and Kidneys,” I discussed the increased prevalence of magnesium deficiency and addressed the question: “Can magnesium help kidney function?” Magnesium is the fourth most abundant mineral in the body. It is essential for many biological functions. As I discussed in part one, magnesium is also crucial for kidney health. Here, in part two of our discussion on magnesium and the kidneys, I discuss the reasons for magnesium deficiency and the current literature on measuring and supplementing magnesium in people with chronic kidney disease (CKD).

Magnesium deficiency

Causes of magnesium deficiency

Poor dietary choices

There has been a steady decline in magnesium content in cultivated fruits and vegetables over the past 100 years. This is caused by the depletion of magnesium in soil over time. In addition, utilizing phosphate-based fertilizers leads to the formation of magnesium phosphate salts that are not soluble. This means the soil is deprived of both components: magnesium and phosphorus.

On top of that, the rise of ultra-processed food and drinks have also contributed to the depletion of magnesium in the modern standard American diet. Grain bleaching and vegetable cooking and adding preservatives can lead to a significant loss of magnesium content. Preservatives such as various forms of phosphate and oxalate can bind with magnesium and prevent its absorption. Phosphoric acid in soft drinks has similar effects.

The addition of fluoride to drinking water also prevents magnesium absorption by binding to it and forming insoluble complexes. Finally, drinking caffeine and alcohol can also lead to an increase in the excretion of magnesium by the kidneys, causing magnesium deficiency.

Join us in the fight against kidney disease and receive the FREE report “5 Pitfalls to Avoid When Caring for Kidney Patients”

Drug-induced magnesium deficiency

Many medications can interfere with magnesium absorption or increase its excretion, leading to deficiency. Most of the medications leading to magnesium deficiency are summarized in the following table:

Medication class Example Mechanism
Anti-diabetic medications Insulin, insulin mimetics Interferes with Na/Mg exchange leading to renal loss
Antimicrobial Gentamicin, pentamidine, foscarnet, amphotericin B Increased renal loss
Beta agonists Salbutamol Renal loss and cellular shifts
Bisphosphonate Pamidronate Renal loss
Cardiac glycoside Digoxin Increased renal loss
Chemotherapy agents Cisplatin Renal loss
Diuretics Thiazide diuretics Renal loss
Proton-pump inhibitors Omeprazole Decreased GI absorption



Measuring magnesium status

Simply put, there is no ideal test for assessing magnesium status in the body. Mg blood levels are tightly controlled and represent only 0.8% of total body stores (0.5% in red blood cells and 0.3% in the serum). Red blood cell Mg levels have been used as an alternative method, but this too does not represent total body stores and is not well validated. Measuring urine Mg requires measuring a 24-hour urine specimen. This too has been found to be imperfect due to large variations from day to day.

The Mg retention test has been proposed as a more accurate way to assess Mg status. Here, the patient receives an intravenous Mg load (0.25 mmol magnesium/kg body weight at a rate of 2.5 mmol/hour), and a 24-hour urine specimen is collected before and after the load. The percentage of administered magnesium that is retained by the body (not excreted in urine) determines magnesium status. This test is not standardized yet, but retention of 25%-50% may indicate a moderate deficiency, and retention of more than that may indicate severe deficiency.

Ideally, measuring muscle or bone magnesium may be more reflective of accurate magnesium stores but this is obviously not practical. Combining a serum Mg test, a 24-hour urinary Mg, and assessing dietary Mg intake is the most comprehensive and practical evaluation of a patient’s magnesium status.


Combining a serum Mg test, a 24-hour urinary Mg, and assessing dietary Mg intake is the most comprehensive and practical evaluation of a patient’s magnesium status
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Patients at high risk for magnesium deficiency include:

  • Diabetics
  • Heart disease patients
  • Osteoporosis patients
  • People who eat a diet high in processed food and soda
  • People who suffer from leg cramps
  • People with metabolic syndrome
  • People who take certain medications

Those patients at risk of magnesium deficiency should be targeted for additional testing and supplementation.

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What type of magnesium should I take?

The type of magnesium supplement used depends on the exact indication. Magnesium supplements are available as oxide, hydroxide, gluconate, chloride, citrate, lactate, malate, taurate, L-threonate, sulfate, glycinate, orotate, and carbonate salts. In addition to magnesium citrate’s direct effects on kidney stones, magnesium benefits the person with kidney disease through its effects on blood pressure, insulin sensitivity, vascular health, and bone. The following indications are listed with the recommended types of magnesium supplements and doses. These doses are for prevention only. Patients who are deficient may need higher doses. Magnesium supplements should be discontinued or decreased in kidney patients if the serum magnesium level is higher than 2.6.

Indication Mg type Dose
Prevention of kidney stones Magnesium citrate 400 mg daily
Bone health Magnesium citrate or chloride 400 mg daily
Improving blood pressure Magnesium taurate 400 mg once or twice daily
Improving insulin sensitivity Magnesium taurate 400 mg once or twice daily
Improving vascular health Magnesium glycinate or orotate 200-400 mg daily
Phosphate binder Magnesium carbonate 250 mg with meals

We recommend using high-quality supplements. This article can be a useful guide.



The bottom line

Magnesium is essential to many biological functions, as I described in part one, “Magnesium and Kidneys.” It has many health benefits for kidney, bone, and vascular health. Assessing magnesium status is difficult but magnesium deficiency is very common and underrecognized. Supplementing magnesium may be important for patients with kidney disease. The type of supplement used depends on the indication. As always, it is recommended that you check with a Functional or Integrative Medicine provider and nephrologist before taking any new supplement.

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Genetics of Kidney Stones https://old.inkidney.com/genetics-of-kidney-stones/ Wed, 29 Jul 2020 03:31:13 +0000 https://old.inkidney.com/?p=2246 Kidney stone development is the composite end-result of multiple factors including genetic, dietary and environmental, and can have serious consequences. They are often painful and if left unaddressed can lead to more severe conditions such as obstruction of urinary flow and permanent damage to the kidneys. Recurrent kidney stones are one of the common causes...

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Kidney stone development is the composite end-result of multiple factors including genetic, dietary and environmental, and can have serious consequences. They are often painful and if left unaddressed can lead to more severe conditions such as obstruction of urinary flow and permanent damage to the kidneys. Recurrent kidney stones are one of the common causes of CKD. Here we will discuss the genetics of kidney stones.

In this series we’re focusing on the integrative approach to preventing kidney stone formation.

genetics of kidney stones

Conventional approaches to kidney stones tend to focus on medications, surgical removal, and using ultrasonic waves to break up stone. It rarely approaches the root cause including risk factors to prevent stone formation.

We covered the impact of diet, the microbiome and gut health, and electrolyte imbalances on kidney stones in previous blogs. Here we will discuss the role genetics play in kidney stone formation.

The Genetics of Kidney Stones

There seems to be a familial link when it comes to the development of kidney stones. In fact, two thirds of patients with calcium-containing kidney stones have a relative with kidney stones. Recently, genome-wide association studies uncovered several genetic sequence variants (SNPs) that lead to increased risk of kidney stone development. Although we are still scratching the surface in understanding the contribution of genetic factors to stone formation, we do know that we can modulate these risks through environmental and dietary modifications. 

Genetic Variations in Calcium Handling

In a previous blog, we discussed the role of the kidney filtration units (specifically the nephrons). The kidneys are responsible for filtering large volumes of blood daily. This function is crucial, and, the unique design of the nephrons make it able to adjust this filtrate and prevent dehydration. This intricate design also makes the kidneys crucial in the balance of water and many electrolytes

Calcium is one of the electrolytes filtered and reabsorbed in the kidneys. Calcium sensing receptors (CaSR) are present in kidney cells and are essential for the reabsorption of calcium. These receptors increase and decrease the amount of calcium reabsorbed based on the calcium level in the blood. In other words, activating these receptors increases the amount of calcium lost in the urine.

Single nucleotide polymorphisms (SNPs) in CaSR have been found to alter the function of these receptors leading to increased urinary excretion of calcium. Of particular interest, SNPs in rs7652589 and rs1501899 were associated with kidney stones in patients with normal citrate excretion. SNPS in rs1801725, rs1042636 of the CaSR gene were also associated with kidney stones in various populations.

Another gene that has been associated with increased calcium in the urine is the gene coding for the protein Claudin-14, responsible for forming tight junctions. This protein helps connect adjacent cells to form a barrier which acts like a gate, separating blood from urine.  Tight junctions are also responsible for ensuring that minerals don’t pass between the cells. SNPs in the genes that code Claudin-14 (CLDN14) alters the integrity of these “gates” and allows for calcium to “sneak” between cells into the urine,  increasing the risk for kidney stone formation. Specifically, SNPs at the locations rs219778, and rs219780 of the CLDN14 gene were significantly associated with kidney stones.

Genetic Variations in Vitamin D Receptors (VDR)

Vitamin D plays a crucial role in calcium balance. Studies have shown that vitamin D increases the absorption of calcium from the gut and also increases calcium excretion in the urine. Vitamin D receptors are essential for vitamin D to exert its action on calcium balance.

Some mutations or SNPs in the VDR are associated with increased absorption and excretion of calcium, significantly increasing the risk of kidney stones. It is worth mentioning here that there is some controversy about the link between vitamin D supplementation and kidney stone formation. Vitamin D deficiency appears to be common among kidney stone formers. This is likely because low vitamin D causes calcium loss from the bone in order to maintain normal calcium range in the blood for cardiovascular protection. Even though vitamin D3 supplementation may increase calcium excretion in the urine, it has not been conclusively found to increase the risk of kidney stone formation. 

Therefore, genetic assessment may be a key to identify patients who are at risk of kidney stone formation from taking vitamin D supplements.

Genetic Variations in the Handling of Other Minerals

The kidneys are crucial for balancing many minerals in our bodies such as magnesium, phosphate, oxalate and others. Genetic mutation or SNPs affecting the genes that code for the channels or receptors that regulate these minerals can also impact the risk of kidney stones. Some SNPs on the other hand can be protective against kidney stones such as SNPs in the UMOD gene. Discussion of this long list of SNPs requires details  beyond the scope of this blog, but we summarized most of the genes that have been associated with kidney stones in the table below.

Gene symbol Gene name Phenotype
ADCT10 Adenylate cyclase 10 Increased calcium excretion
AGXT Alanine-glyoxylate aminotransferase Increased oxalate excretion
CA2 Carbonic anhydrase II Osteoporosis + decreased acid excretion
CASR Calcium-sensing receptor Increased calcium excretion
CLCN5 Chloride channel, voltage-sensitive 5 Dent disease
CLCNKB Chloride channel, voltage-sensitive Kb Bartter Syndrome, type 3
CLDN14 Claudin 14 Increased calcium excretion
CLDN16 Claudin 16 Increased calcium and magnesium excretion
CLDN19 Claudin 19 Increased calcium and magnesium excretion
CYP24A1 Cytochrome P450 Decreased breakdown of vitamin D3
GRHPR Glyoxylate reductase Increased oxalate excretion
HOGA1 4-Hydroxy-2-oxoglutarate aldolase 1 Increased oxalate excretion
HPRT1 Hypoxanthine phosphoribosyltransferase 1 Increased uric acid excretion
SLC12A1 Solute carrier family 12, member 1 Bartter syndrome, type 1
SLC26A1 Solute carrier family 26, member 1 Calcium oxalate kidney stones
SLC22A12 Solute carrier family 22, member 12 Decrease uric acid excretion
SLC2A9 Solute carrier family 2, member 9 Decreased uric acid excretion
SLC34A1 Solute carrier family 34, member 1 Calcium phosphate kidney stones
SLC34A3 Solute carrier family 34, member 3 Calcium phosphate kidney stones
SCL3A1 Solute carrier family 3, member 1 Increased Cystine excretion
SLC4A1 Solute carrier family 4, member 1 Decrease acid excretion (dRTA)
SLC7A9 Solute carrier family 7, member 9 Increased Cystine excretion
SLC9A3R1 Solute carrier family 9, subfamily A, member 3, regulator 1 Calcium phosphate kidney stones
UMOD Uromodulin (most common urine protein) Protective against kidney stones
VDR Vitamin D (1,25-dihydroxy D3) receptor Increased calcium excretion
XDH Xanthine dehydrogenase Increased xanthine excretion

The Bottom Line

There are many factors that impact the risk of kidney stone development. Although there are pure genetic diseases that are associated with kidney stones, often the increased risk is subtle or offset by other factors. Increased risk, when combined with other factors including nutrient depletion, dysbiosis, electrolyte imbalances and dehydration, may lead to the development of kidney stones in some. Assessing the genetic profile of kidney stone patients can help identify the root cause of the disease to tailor appropriate, personalized management. Practitioners working with individuals to prevent kidney stone formation should formulate a comprehensive and individualized intervention that modifies all relevant components in their integrative approach. 

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Electrolyte Imbalances and Kidney Stone Formation https://old.inkidney.com/electrolyte-imbalances-and-kidney-stone-formation/ Sat, 27 Jun 2020 01:23:08 +0000 https://old.inkidney.com/?p=2204 The formation of kidney stones is complex, with influence from multiple factors including genetic and environment. Stones can be costly. Not only can they be painful, if left unaddressed, more serious conditions can arise such as obstruction and permanent damage to the kidneys. In this blog we focus on electrolyte imbalances and kidney stone formation. As...

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The formation of kidney stones is complex, with influence from multiple factors including genetic and environment. Stones can be costly. Not only can they be painful, if left unaddressed, more serious conditions can arise such as obstruction and permanent damage to the kidneys. In this blog we focus on electrolyte imbalances and kidney stone formation.

genetics of kidney stones

As discussed in a previous blog, there are five major types of kidney stones: calcium oxalate, calcium phosphate, uric acid, struvite (magnesium ammonium phosphate), and cystine. Calcium oxalate is by far the most common, comprising approximately 75% of kidney stones. Therefore, the first step in evaluating a kidney stone patient is identifying the type of kidney stone they are forming. This can be done by stone analysis and by obtaining a 24-hour urine analysis for various metabolites and electrolytes.

In this series, we’re focusing on the integrative approach to preventing kidney stone formation.

 

Conventional approaches to kidney stones typically focus on medications, surgical removal, and using ultrasonic waves to break up a stone. It rarely addresses  the root cause including risk factors to prevent stone formation.

We covered dietary approach and microbiome and gut health in previous blogs. In this blog, we will discuss the impact of electrolyte imbalances on kidney stone formation and prevention.

Calcium imbalances

Since most kidney stones are composed of calcium oxalate, oftentimes patients ask if restriction  of dietary calcium is necessary. Dietary calcium intake has many benefits including maintaining adequate bone health and decreasing oxalate absorption from the gut. In fact, evidence suggests that restricting calcium intake leads to increased oxalate absorption, in turn increasing the risk for kidney stone formation. Furthermore, there is a significant link between kidney stones and metabolic bone diseases such as osteoporosis, although it is not yet clear if this link is related to calcium imbalances or other causes.

It’s the concentration of calcium in the urine that is important to track. The higher the urinary concentration of calcium, the higher the risk of oxalate binding to calcium (or other minerals) and forming kidney stones. 

There are several factors that lead to increased calcium concentrations in the urine, including increased calcium excretion by the kidneys and decreased water intake. Factors increasing urinary calcium excretion include  high sodium (salt) intake, genetic factors, certain medications, and certain medical conditions such as disorders of the parathyroid gland

This explains why  restricting sodium intake and increasing water intake are useful for decreasing the risk of stone formation. It is generally recommended that kidney stone formers drink at least 2 liters of filtered free water every day (some require more, especially if they are overweight/obese or losing fluid from physical activity or sweating). In general, we recommend that patients maintain a balanced diet providing1000 mg per day of calcium. . When taken with meals, calcium supplements bind oxalate in the food and prevent it from getting absorbed; however, calcium supplementation is controversial and should be monitored closely by a provider.

Oxalate imbalances

In a previous blog, we mentioned that oxalates play a role in the formation of kidney stones with 75% of kidney stones a result of calcium oxalate formation. As we discussed above, there is a significant connection between calcium consumption and the level of absorbed oxalate. Low oxalate diets have been proposed as a way to minimize stone formation, however, these are incredibly challenging to maintain.   Oxalate restriction is challenging because oxalates are present in a large number of many healthy foods, risking nutrient deficiencies. Furthermore, the gut microbiome plays an important role in the absorption of oxalate

Additionally, there are a few genetic variations in the oxalate gatekeepers in the gut and red blood cell transporters that impact/increase oxalates in the urine. Problems with fat digestion and absorption as seen in small bowel disease, gastric bypass, or pancreatic insufficiency can lead to increased oxalate absorption in the colon. That is why it is important to address gut integrity with a comprehensive gut restoration protocol in patients with kidney stones. 

Citrate imbalances

Urinary citrate may be the most significant factor in formation of calcium oxalate stones. Citrate helps increase urinary pH (making it more alkaline or basic), preventing the binding of calcium and oxalate. It also binds calcium in the urine, further preventing kidney stone formation. The concentration of citrate in the urine is dependent on blood acidity, the higher the dietary acid load, the higher the risk of developing kidney stones. This phenomenon may explain why diets high in animal protein have been associated with the development of kidney stones (more about that in another blog here). 

In addition, potassium depletion is often associated with pH changes that lead to decreased urinary citrate levels. Potassium depletion can also increase calcium excretion in the urine. Therefore, it is important to correct any potassium depletion in patients with kidney stones. This is why most citrate supplements that are used for kidney stone prevention are usually in the form of potassium citrate

Magnesium imbalances

Magnesium plays an important role in the prevention of kidney stones. Although the way magnesium decreases the risk of kidney stones is not completely clear, evidence suggests that magnesium lowers oxalate absorption in the gut. Magnesium also increases the level of citrate in the urine which, as we saw above, decreases the risk of kidney stones. 

Finally, magnesium can bind oxalate in the urine making it less available for binding with calcium and forming kidney stones. Magnesium oxalate compounds are 100 times more soluble than calcium oxalate. In fact, supplementing magnesium was found to be effective in preventing kidney stones even with patients with normal magnesium.

Uric acid imbalances

Uric acid stones are common in patients with metabolic syndrome and type 2 Diabetes. Elevated uric acid levels in the urine can lead not only to uric acid stones but also to calcium oxalate stone formation. In many instances, calcium oxalate stones have a center (nidus) composed of uric acid. Uric acid is the end product of the breakdown of purine, a product of digestion of nucleic acid in food (meat, poultry and fish) or tissue breakdown. Therefore, limiting the intake of animal protein may be a useful therapeutic approach for prevention of kidney stone formation.

Uric acid forms crystals in highly acidic urine. This is another contributing factor linking a high (animal) protein diet to increased acid load and increased uric crystal stone formation, compounding the impact of uric acid release

The Bottom Line

Many factors impact kidney stone formation, including electrolyte imbalances. Stone formation is usually not caused by a single electrolyte but rather it is likely a combination of factors impacting electrolyte balance, including nutrient depletion and dehydration. Diets low in plant-based foods and high animal protein tend to increase risk of stone formation due to an interplay of factors. Risk of kidney stone formation should be evaluated by weighing the impact of poor dietary choices combined with environmental factors, genetics, gut integrity and microbiome balance.

This is the foundation of our integrative approach to managing and prevention of kidney stones. Practitioners working with individuals to prevent kidney stone formation should formulate a personalized approach that modifies all relevant components in their comprehensive approach for best outcomes. 

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The Microbiome and Kidney Stone Formation https://old.inkidney.com/the-microbiome-and-kidney-stone-formation/ Wed, 06 May 2020 02:16:32 +0000 https://old.inkidney.com/?p=2153 This blog is part of a series discussing our integrative approach to kidney stone prevention and management. In this blog we will focus on the microbiome and kidney stone formation. Kidney stone formation (urolithiasis) is a complex disease influenced by multiple factors including diet, genetics, and environment. They are painful, inconvenient, and when left untreated,...

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This blog is part of a series discussing our integrative approach to kidney stone prevention and management. In this blog we will focus on the microbiome and kidney stone formation.

Kidney stone formation (urolithiasis) is a complex disease influenced by multiple factors including diet, genetics, and environment. They are painful, inconvenient, and when left untreated, they may contribute to more serious conditions including obstruction and kidney damage.

Pictures of kidney stones with the gut in the background depicting the relationship between microbiome and kidney stone

By Lara Zakaria, PharmD, CNS, CDN, IFMCP

Read more about the etiology and prevalence of kidney stones here.

In this series we’re building a case for a more integrative approach to preventing kidney stone formation.

Conventionally, the treatment approach does address kidney stones via a multi-pronged approach that may include medication, dietary and lifestyle, surgical removal, and using ultrasonic waves to break up stone.

However, these guidelines tend to focus too far downstream, on stone composition instead of on the underlying pathology upstream. Instead, we advocate for a more comprehensive approach that focuses on risk factors to prevent formation. Those factors include:

·       Type of stone

·       Socioeconomic factors

·       Environment

·       Diet

·       Hydration and electrolyte balance

·       Microbiome and gut health

·       Genetics

We covered individual dietary components in detail in a previous blog. Today we’ll look at the gut-kidney stone connection and the impact of the microbiome.

Gut Integrity and Kidney Stones: Leaky Gut

A normal and healthy GI tract has a natural barrier. This barrier serves to protect the GI and has three major jobs: 1. ensure proper digestion and absorption of nutrients and 2. ensure elimination of toxins and 3. protect the integrity of the microbiome – the “good” bacteria that lives in our GI tract and works with our body to maintain health.

Leaky gut describes a state when the cells that make up the lining of the GI tract separate enough to allow the contents of the gut to leak out. This is also sometimes called intestinal permeability or IP for short. This is a problem because it reduces absorption of nutrients, causes toxins to build up, alters the balance of the gut microbiome, and results in systemic inflammation.

One of the major contributors to leaky gut is the standard American diet (SAD), which seems to increase risk of kidney stone formation. When we use the term SAD, we are generally referring to a diet that includes:

·       Consumption of sugary beverages and soda (and high carbohydrate consumption in general)

·       Increased intake of processed/refined foods like cereals, crackers, baked goods, etc…

·       Processed, fried, conventionally raised, high-nitrate animal protein

·       Low intake of fiber and fresh produce in general

·       A “beige” diet (low in phytonutrients and antioxidants) from consuming a variety of colorful fruits and vegetables 

·       Inadequate amounts of healthy, anti-inflammatory fats, and high amounts of refined unhealthy fats

We have already established that eating more fresh produce, is protective from kidney stone formation, and we’ve done a deeper dive on specific nutrition impact on kidney stone risk in another blog if you’d like to learn more.

There are several factors that may contribute to development of leaky gut:

·       “Proinflammatory” SAD: too much processed and high-sugar foods, not enough fiber and the wrong inflammatory fats

·       Food sensitivities: consuming food that are cause reactivity

·       Overconsumption of caffeine and alcohol – irritants to gut lining

·       Use of certain medications, including NSIADs, steroids, antibiotics

·       Stress and poor-quality sleep

We address risk factors for intestinal permeability in more detail in a previous blog here, as well as dive into a comprehensive gut restoration strategy here in this 5-part series

The Microbiome and Kidney Stones

Balance of the gut bacteria also play an important role in causing or preventing kidney stones. The most studied organism is Oxalobacter formigenes, which has been found to be protective when present in adequate quantities as part of the GI microflora. This bacterium degrades oxalate in the gut decreasing its absorption and excretion in the urine.

When Oxalobacter was discovered, scientists thought they had pinpointed the key to curing kidney stones. They concluded that simply supplementing this missing species should reduce risk of stone formation in susceptible individuals. It would turn out that the connection wasn’t that simple.  

More recent evidence points to a more complex picture in the connection between microbiome diversity and kidney stone pathology. The emerging research shows increased risk in kidney stone formation in certain susceptible individuals also presented with alterations in normal microbiome and metabolome (metabolic byproducts from microflora) – also termed dysbiosis.

In other words, it’s likely that genetic factors might be “turned on” by dysbiosis leading to increased risk of kidney stone formation in certain individuals. The good news is that means they should be “turned off” when the microbiome balance is restored.

Studies that looked at the use of targeted probiotics have failed to show enough significant improvement of risk of urolithiasis. Although there’s been some limited and temporary reduction in oxalate excretion and kidney stone formation with the use of a combination of Lactobacillus, Bifidobacterium, Enterococcus, it’s been shown to be temporary and limited in benefit. This is because dysbiosis cannot be addressed by simply applying a band aid of a probiotic.

We recommend instead a more comprehensive approach to gut restoration and microbiome balance. You can read more about the 5R protocol in our comprehensive 5-part series on gut restoration. 

The Bottom Line

Although initial findings about the impact of the microflora that looked at Oxalobacter in isolation have not demonstrated significance in reducing incidence of kidney stone formation, more recent evidence pointing to an interplay of factors on microbiome diversity is promising. Furthermore, factors that impact kidney stone formation include dietary factors, including food quality, nutrient composition, and dehydration. Along with environmental factors, lifestyle, genetics, and gut integrity and microbiome balance should be addressed through a comprehensive and personalized approach. Practitioners working with individuals to prevent kidney stone formation should formulate a patient care plan that modifies all relevant components in their integrative approach to maximize effectiveness in preventing urolithiasis.

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