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Kidney stones and dietary intake in adults: a population-based study in southwest Iran

BMC Public Health volume 24, Article number: 955 (2024) Cite this article

Abstract

Background

The prevalence of kidney stones is on the rise globally. Several risk factors, including lifestyle, contribute to the formation of kidney stones. Nevertheless, there is a contentious debate about the relationship between diet and kidney stones. Therefore, our study aimed to assess the relationship between macronutrients and micronutrients and the formation of kidney stones.

Methods

This population-based cross-sectional study was conducted in the baseline phase of the Hoveyzeh Cohort Study, focusing on adults aged 35–70 in southwest Iran. The information on demographic characteristics, anthropometrics, kidney stone history, and food frequency was collected. Chi-square and t-tests were utilized to assess the relationship between categorical and numerical variables with kidney stones. The ANCOVA and logistic regression models were used to evaluate the relationships while controlling for confounding factors.

Results

Among 10,009 participants, the overall prevalence of kidney stones was 18.77% (95% CI: 17.99–19.53). A higher intake of carbohydrates [OR = 1.02 (95% CI:1.002–1.03), p = 0.026] and copper [OR = 1.04 (95% CI:1.01–1.09), p = 0.025] were found to be associated with kidney stones. No associations were found between the other assessed macronutrients or micronutrients and kidney stones (p-tvalues > 0.05).

Conclusion

Our study’s findings indicate a correlation between diet and the formation of kidney stones. However, the relationship between dietary factors and kidney stones is complex, and further research is needed.

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Background

Kidney stones are solid mineral deposits formed from dissolved minerals in the urine. They are mainly excreted through the urethra [1]. The prevalence of kidney stones ranges from 1 to 15% worldwide [2]. In Iran, it ranges from 1.9 to 5.7%, with a higher rate observed in the western provinces [3, 4]. The recurrence rate of kidney stones is high, with approximately 50% of patients experiencing a recurrence within 10 years [5]. The annual cost of treating kidney stones in the United States was $2.1 billion in 2000 and is projected to exceed $4 billion by 2030 [6]. The formation of kidney stones can be influenced by various factors, including demographic characteristics and environmental factors [7].

Previous studies have shown that dietary factors play a significant role in the development of kidney stones. High salt intake, low water intake, low consumption of dairy products, low intake of tea, consumption of oxalate-rich foods, and consumption of processed foods are all associated with an increased risk of kidney stones [8, 9]. On the other hand, consuming higher levels of potassium, magnesium, fiber, and vitamin B6 is considered to be a dietary inhibitor for calcium-containing stones [10]. A study conducted in Switzerland found that the probability of developing kidney stones was higher with increased consumption of cakes, biscuits, and soft drinks, and lower consumption of nuts and seeds, fresh cheese, teas, and alcoholic beverages, particularly wine [11]. Moreover, reduced consumption of vegetables, coffee, and alcoholic beverages increased the probability of developing kidney stones [12].

Given the high risk of kidney stone recurrence and the costs of the disease on the healthcare system and society, understanding the risk factors, including nutritional factors, is crucial for the design of prevention and treatment strategies. However, conflicting results have been obtained regarding the factors associated with kidney stone formation [1,2,3, 7, 13, 14]. Furthermore, there have been few studies in Iran that have examined the nutritional factors influencing kidney stones among adults in the context of a population-based study. Therefore, the present study investigated the associations between nutritional factors and kidney stone disease among adult residents of southwest Iran.

Methods

Design study and participants

This was a population-based cross-sectional study in Southwest Iran. A total of 10,009 individuals, aged 35–70 years, were recruited for the enrollment phase of the Hoveyzeh cohort study (HCS) from May 2016 to August 2018 and were assessed in this analysis [15]. The Hoveyzeh cohort study is one of the branches of the Prospective Epidemiological Research Studies in Iran (PERSIAN) [16] focused on non-communicable diseases. Informed consent was obtained from all individuals who wished to participate in the study. The inclusion criteria were individuals aged between 35 and 70 years, residing in the Hoveyzeh district, without severe mental disorders, ability to answer the questionnaires independently. We excluded participants with missing data on kidney stones and frequency of food questionnaire (FFQ), as well as those unwilling to participate in the study.

The Ethics Committee of Ahvaz Jundishapur University of Medical Sciences approved the study protocol (IR.AJUMS.REC.1398.279). This study was conducted in accordance with the Helsinki Declaration and its later amendments. On the day of registration, we obtained written informed consent.

Covariates

Each participant completed the questionnaires, and well-trained interviewers conducted the anthropometric measurements. The variables in this analysis included age groups (35–39, 40–44, 45–49, 50–54, 55–59, 60–64, and ≥ 65 years), sex (male, female), residence type (urban and rural), and marital status (single, married, widowed, and divorced). The education levels are categorized as illiterate, primary school, secondary school, high school, diploma, and university. The physical activity was assessed using the International Physical Activity Questionnaire (IPAQ), which records participants’ self-reported daily activity over a 1-year period. The physical activity and metabolic equivalent (MET) scores were reported for a 24-hour task [17, 18], and then they were categorized into quartiles in our analysis. The validity of the International Physical Activity Questionnaire (IPAQ) in Iran has been evaluated by Moghaddam et al. [19]. Body mass index (BMI) is calculated by dividing a person’s weight in kilograms by their height in meters squared (kg/m2). A BMI below 18.5 is considered underweight, 18.5–24.9 is within the normal range, 25.0-29.9 is classified as overweight, and over 30 is considered obese. In our study, a smoker is defined as an individual who has smoked at least 100 cigarettes in their lifetime.

Dietary assessment

A semi-quantitative food frequency questionnaire (FFQ) consisting of 130 food items was utilized to evaluate individuals’ typical food consumption. The validity and reproducibility of the questionnaire were evaluated by Eghtesad et al. [20]. All the questionnaires were completed by a trained nutrition expert during face-to-face interviews with the participants. The participants reported the frequency of their consumption of each item over the past year, indicating whether it was daily, weekly, monthly, or yearly. Portion sizes of each food were converted to grams using household measures [21].

Kidney stone assessment

The participants self-reported a history of kidney stones if the disease had been previously diagnosed by a doctor. Furthermore, all medical documents, including ultrasounds, photographs, laboratory reports, and surgical records, have been reviewed and verified by the team’s physicians. All medical documentation, including ultrasound images, photographs, laboratory reports, and surgical-related documents, has been thoroughly reviewed and verified by the team’s doctors.

Statistical analysis

The data was described by reporting the frequency and percentage of the categorical variables, as well as the mean and standard deviation of the quantitative variables. The chi-square test evaluated the relationship between categorical variables. The Kolmogorov–Smirnov test and the normal Q-Q plot were utilized to assess the normality hypothesis for all food groups. The independent t-test was utilized to compare continuous variables between the two groups. We investigated the independent associations of the assessed factors with kidney stones using ANCOVA and unconditional multiple logistic regression, while controlling for confounding factors. In the univariate analysis, the criterion for initially entering variables into multiple regression models was set at P < 0.25. All reported p-values were based on two-tailed tests and were considered significant at a level of 0.05. We performed data analysis using STATA software version 15.

Results

A total of 10,009 individuals who participated in the enrollment phase of the Hoveyzeh cohort study were evaluated in this analysis. The mean age of the participants was 48.76 ± 9.21 years, and approximately 60% of them were women. The overall prevalence of kidney stones was 18.77% (95% CI: 17.99–19.53). The prevalence was significantly higher in men (24.20%) compared to women (15.10%) (P < 0.001). Furthermore, individuals in the 50 to 54 age group exhibited the highest prevalence rate (21.9%) of kidney stones (Table 1).

Table 1 Prevalence rates of Kidney stones by sex and age groups
Full size table

Table 2 compares demographic, socioeconomic, and lifestyle variables between individuals with and without kidney stones. The study revealed that individuals with kidney stones were significantly more likely to be male, reside in urban areas, have a higher wealth status, engage in less physical activity, and be smokers compared to those without kidney stones. However, the educational level and BMI were not statistically different between the two groups.

Table 2 Characteristics of the participants based on kidney stone disease
Full size table

After adjusting for age, sex, body mass index, physical activity, wealth index, and residence type, a significant difference in dairy product consumption between the two groups was observed using ANCOVA. The mean dairy consumption was significantly lower in the group with kidney stones (p = 0.014). Additionally, participants with kidney stones had a higher average intake of oils and sweets compared to those without kidney stones (p = 0.001). On the other hand, there was no significant difference in the average consumption of the other food items between individuals with and without kidney stones (p > 0.05). (Table 3).

Table 3 Comparison mean of food pyramid intake between two groups with and without kidney stones by the results of ANCOVA
Full size table

To control for potential confounding variables, multiple logistic regression analysis was performed using two models. In Model 1, the macronutrients were assessed, while in Model 2, the micronutrients were assessed. According to the logistic regression analysis, the crude and adjusted odds ratios were calculated to evaluate the association between kidney stones and macronutrients. The results are presented in Table 4. After adjusting for potential confounders, an increased consumption of carbohydrates was associated with significantly higher odds of kidney stones [OR = 1.02 (95%CI:1.002–1.03), p = 0.026]. On the other hand, no significant associations were found between protein intake, fat intake, and fiber intake with kidney stones (all p-values > 0.05).

Table 4 Crude and adjusted Odds Ratios and their 95% confidence intervals for the assessed macronutrients using the Logistic Regression Model. (Model 1)
Full size table

In Model 2, after adjusting for potential confounders, among the evaluated micronutrients, the consumption of copper was found to significantly increase the odds of developing kidney stones. On average, for every 10 mg per day increase in copper intake, the odds of developing kidney stones increased by 4% [OR = 1.04 (95% CI:1.01–1.09), p = 0.025]. Although a higher intake of zinc slightly decreased the odds of developing kidney stones [OR = 0.95 (95% CI: 0.90-1.001) (p = 0.056)]. Moreover, no significant associations were found other assessed micronutrients with kidney stones (all p-values > 0.05). The details are presented in Table 5.

Table 5 Crude and adjusted Odds Ratios and their 95% confidence intervals for the assessed micronutrients using the Logistic Regression Model. (Model 2)
Full size table

Discussion

Our study aimed to investigate the relationship between food consumption and kidney stones. The main findings revealed a prevalence of kidney stones at 18.77%, with a higher prevalence among men, individuals residing in urban areas, those with high wealth status, less physical activity, and smokers. After adjusting for potential confounders, the participants with kidney stones had a lower average intake of dairy products and a higher average intake of oils and sweets compared to those without kidney stones. Furthermore, individuals with a higher carbohydrate intake had significantly higher odds of developing kidney stones.

We found a significant inverse relationship between kidney stones and dairy intake. In line with our results, one study found that consuming dairy is associated with a reduced risk of kidney stones [22]. However, increased milk intake is recommended for uric acid-related stones [23]. Therefore, policies that promote a diet high in dietary alkali load can help reduce the risk of kidney stone formation. These policies can support public health initiatives aimed at reducing the prevalence of kidney stones.

The results revealed a direct association between carbohydrate intake and kidney stones. In line with the results of our study, some research has suggested that consuming a high-carbohydrate diet may increase the risk of developing kidney stones [24]. High-carbohydrate diets may contribute to the formation of kidney stones by increasing calcium excretion in the urine. When the body breaks down carbohydrates, it produces an acid called oxalate, which can bind with calcium in the urine and form crystals. This, in turn, can lead to the formation of kidney stones. However, it is important to note that complex carbohydrates, such as those found in whole grains, fruits, and vegetables, are generally healthier than simple carbohydrates found in processed foods and sugary drinks [24, 25].

Our study revealed that there was no statistically significant association between kidney stones and vegetable consumption. In line with our study, the UK Biobank study showed that vegetable intake was not associated with the incidence of kidney stones [5]. However, several studies have indicated that consuming vegetables may reduce the risk of developing kidney stones [10, 26,27,28]. However, specific types of vegetables, especially leafy greens, have been identified as potential risk factors for the condition [29, 30]. This is because leafy greens contain a significant amount of oxalates, which can consequently increase the risk of developing oxalate-based stones, the most common type of kidney stone [12, 31]. The study conducted by Taylor and Curhan [32] also found no association between fruit consumption and kidney stones. Several studies have found that specific fruits, such as grapefruit, may elevate the risk of kidney stone formation. However, other fruits, such as oranges, have been found to have a protective effect against stone formation [33]. These contradictory results may be attributed to the varying levels of nitrates in different fruits.

We found that there was no statistically significant difference in the consumption of meat, beans, protein, fat, and fiber between the individuals with kidney stones and those without the condition. Previous prospective studies that have primarily focused on animal protein intake have yielded inconsistent evidence [34, 35]. These conflicting results may depend on the type of meat consumed and the balance of food types in the diet. A high-protein diet results in higher acid levels in the human body, leading to an increase in the excretion of calcium in the urine. Animal protein contains purines, which are broken down into uric acid in the body. Elevated levels of uric acid in the urine can also contribute to the formation of kidney stones [36]. However, these findings were inconsistent with the results of our study. A study showed that diets high in healthy fats, such as nuts, seeds, fish, and avocados, did not increase the risk of kidney stones [37]. However, other studies have shown a positive correlation between the consumption of fatty acids, such as arachidonic acid, and the excretion of urinary oxalate, which is a risk factor for the formation of kidney stones [38]. However, it appears that the type of fat intake can affect the risk of developing kidney stones. In contrast to our findings, some studies have suggested that a high-fiber diet may help reduce the risk of kidney stones [5, 35, 39]. Because these relationships are complex and not yet fully understood, policies that promote a balanced diet may reduce the risk of kidney stone formation.

Among the evaluated micronutrients, copper intake was directly associated with kidney stones. According to our study, research has shown that urinary copper levels were significantly higher in patients with kidney stones compared to healthy controls [40]. On the other hand, the results showed that intake of manganese, fluoride, zinc, iron, potassium, calcium, and magnesium was not associated with kidney stones. Although, one study showed that manganese deposition could be caused by the hemodialysis method itself [41]. Excessive fluoride may contribute to the development of calcium oxalate renal calculi [42]. Therefore, policymakers need to prioritize regulating fluoride levels in drinking water to prevent potential adverse effects on kidney health. On the other hand, a study reported increased odds of kidney stones with higher zinc intake [43]. The role of dietary potassium in the development of kidney stones is still unclear. A study found that potassium citrate may contribute to the formation of calcium-phosphate stones [44]. The magnesium level in a 24-hour urine analysis has also been found to be directly associated with oxalate levels, suggesting a role for magnesium in preventing stone formation by binding to oxalate [45]. It is important to note that while magnesium may be beneficial in preventing kidney stones, it is not a panacea. Some research, such as a prospective study on dietary calcium and other nutrients, found that a low-calcium diet was associated with an increased risk of kidney stone formation in a group of men. The study authors suggested that reducing calcium intake may lead to an increase in the absorption of oxalate, which can contribute to the formation of kidney stones [46]. It is important to maintain a balanced diet and consult with healthcare professionals for personalized recommendations regarding the intake of these micronutrients to minimize the risk of kidney stones, especially for individuals at high risk.

The results of our study revealed that there is no significant relationship between the consumption of vitamin K, A, B6, B12, and D and kidney stones. Vitamin K2, which is found in fermented foods and produced by bacteria in the intestine, regulates MGP and osteocalcin. These are important for proper mineralization and the inhibition of vascular calcification [47]. According to our study, research has shown that Vitamin B12 levels are not associated with kidney stones [48]. Additionally, a prospective analysis of over 193,000 participants found no statistically significant association between vitamin D intake and the risk of kidney stones [49]. There was no association between vitamin B6 intake and the occurrence of kidney stones in three large prospective cohorts [50, 51]. However, a study by Curhan et al. [52] demonstrated a negative correlation between vitamin B6 intake and the risk of stone formation in women.

This study has several limitations. First, it was a cross-sectional study, which means it cannot establish a cause-and-effect relationship. Second, our study relies on self-reported dietary data, which may be subject to recall bias. Third, we do not consider the composition of kidney stones, which can vary widely and may have different risk factors. On the other hand, the present study had several strengths. Our study had a large sample size, which can increase the statistical power and improve the precision of the estimates. Using a representative sample can improve the generalizability of the results. Additionally, we employed multivariate analysis to adjust for potential confounding factors, thereby enhancing the accuracy of the estimates and identify the independent effects of various risk factors.

Conclusions

Our study’s results suggest a relationship between diet and the formation of kidney stones. It suggests that a high carbohydrate diet and high copper intake may increase the odds of kidney stones. Furthermore, dietary intake can reduce the odds of developing kidney stones. Further research is needed to better understand the complex interplay between genetics, diet, lifestyle, and the risk of kidney stones. It is recommended to seek advice from a healthcare professional before making substantial dietary changes or taking supplements.

Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

We would like to thank the participants and staff of the Hoveyzeh Cohort Study Center who assisted us in conducting this study and the ethics committee of Ahvaz Jundishapur University of Medical Sciences for approving the study protocol.

Funding

This work was supported by the Vice-Chancellor for Research at Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran, grant number HCS-9805.

Author information

Authors and Affiliations

  1. Department of Biostatistics and Epidemiology, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

    Bahman Cheraghian & Zahra Rahimi

  2. Department of Nutrition, Shoushtar Faculty of Medical Sciences, Shoushtar, Iran

    Alipour Meysam

  3. Alimentary Tract Research Center, Clinical Sciences Research Institute, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

    Seyed Jalal Hashemi

  4. Nutrition and Metabolic Diseases Research Center, Clinical Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

    Seyed Ahmad Hosseini

  5. Pain Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

    Amal Saki Malehi

  6. Department of Urology, School of Medicine, Chronic Renal Failure Research Center Imam Khomeini Hospital, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

    Dinyar Khazaeli

Authors
  1. Bahman Cheraghian
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  2. Alipour Meysam
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  3. Seyed Jalal Hashemi
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  4. Seyed Ahmad Hosseini
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  5. Amal Saki Malehi
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  6. Dinyar Khazaeli
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  7. Zahra Rahimi
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Contributions

ZR and MA conceptualized the idea. BCh prepared the design and research instrument. ZR and MA performed data collection and processing. ZR and BCh carried out data analysis.ASM, DKh, SAH, and SJH interpreted research data. All authors reviewed the manuscript.

Corresponding author

Correspondence to Zahra Rahimi.

Ethics declarations

Ethics approval and consent to participate

The ethics committee of Ahvaz Jundishapur University of Medical Sciences approved the study protocol (IR.AJUMS.REC.1398.279). This study was conducted in accordance with the Helsinki Declaration and its subsequent amendments. At the time of enrollment, informed written consent was obtained from all individuals.

Consent for publication

Not applicable.

Competing interests

The authors declare no competing interests.

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Cheraghian, B., Meysam, A., Hashemi, S.J. et al. Kidney stones and dietary intake in adults: a population-based study in southwest Iran. BMC Public Health 24, 955 (2024). https://doi.org/10.1186/s12889-024-18393-1

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  • DOI: https://doi.org/10.1186/s12889-024-18393-1

Keywords

BMC Public Health

ISSN: 1471-2458

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