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НИРКИ KIDNEYS
UDC 616.62-003.7-089.878:616.393 DOI: 10.22141/2307-1257.6.4.2017.114058
Baxhaxa , hrna "ZAotkowska2
Warsaw University of Life Sciences, Warsaw, Poland
'Central Clinic Hospital of the Ministry of Interior and Administration in Warsaw, Diabetes Centre
in Internal Diseases, Endocrinology andDiabetology Clinic, Warsaw, Poland
Main Nutritional Lithogenic Factors in Diets of Polish Patients with Kidney Stones
For cite: Pochki. 2017;6(4):206-210. doi: 10.22141/2307-1257.6.4.2017.114058
Abstract. Background. Nutrition is one of the most important determinants of kidney stone formation. This study was designed to evaluate lithogenic factors in diet of patients with renal calculi. Materials and methods. 40 stone-formers without metabolic disorders stimulating stone formation (e.g. hyperparatyroidism, primary hyperoxaluria) were invited to the study. Antropometric measurements of nutritional status (BMI, WHR), analysis of body composition (BIA), quality and quantitative analysis of patients' eating habits (3-day food records) were conducted. Results. Half of patients were overweight or obese. Their diets contained high amounts of protein, fat, phosphorus, vitamin C and low amounts of fluid, calcium, magnesium, potassium, vitamin B6. Protein consumption was positively correlated with uric acid intake in diets (r = 0.78), and body weight with dietary fat intake (r = 0.58) and uric acid intake (r = 0.55). Conclusions. Complete treatment of nephrolithiasis should include nutritional therapy. No change in customary diets of patients with renal calculi can stimulate lithogenesis process. Keywords: kidney stones; nutrition; overweight; prevention
Introduction
Kidney stone (renal calculus, lat. nephrolithasis, urolithasis) is the third most frequent urinary disease. It occurs on the entire world and affects up to 5 % of the population between 30 and 50 years old which indicates that the disease is a serious social issue in industrialized countries prevalence of nephrolithiasis ranges from 1 to 10 %. Most kidney stones are composed of calcium salts (oxalate, phosphate) [1, 2]. The main causes of stone formation are genetic and environmental factors. Family history of kidney calculi enhances its incidence [3]. Some scientists called nephrolithiasis a "nutritional disease". A significant role in ethiology of the disease is a diet. Diets rich in fat (indirectly) and animal protein (directly) stimulate lithogenesis [4]. In our study we tried to find basic nutritional factors among patients with kidney stones, which may be lithogenic factors.
Materials and methods
We invited patients with kidney stones from Kolejowy Central Hospital, Baby Jesus Hospital Nephrological-Transplant Clinic and Individual Specialistic Medical Practice in Urology Clinic in Gdansk treating patients
with urinary tract diseases, including kidney stone, to take part in the study.
The exclusion criteria were hyperparatyroidism, primary hyperoxaluria or other metabolic disorders stimulating stone formation. 42 patients gave their assent to participate in the study. None of them received any specific dietary consultation before the study. Glomural filtration rate was estimated on the basis of Levey et al. formula [5]. Body Mass Index (BMI) and Waist-Hips Ratio (WHR) were calculated as weight (kg) divided by height squared (m2) and waistline (cm) divided by hips line (m), adequately. Bioimpedance was done according to standardised procedures [6]. In this analysis we used 3-day food records and also on their basis we specified energy and other nutrients intake by means of a computer software Dietetyk, based on Polish Food Nutrition Tables [7]. The results are presented as mean ± SD. BMI, energy, n3, n3/n6 and fibre intakes, because the lack of normal distribution is presented as the median. Since the study was conducted before 2008 the results referred to dietary guidelines for Poland of that time [8]. To describe differences between men and women we used Student's test and nonparametric Mann-Whitney
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test (STATGRAPHICS Plus 4.0). To evaluate correlation simple linear regression analysis was applied.
Results
The characteristics of 42 stone formers are presented in Table 1. There was not any difference in the age of patients, but men had higher BMI and WHR. Among 28 participants with long history of nephrolithiasis (more than 3 years) occurred episodes of recurrence of kidney stones. The most common components of calculi were oxalate salts. A family history of kidney stones occurred with 24 patients. The efficiency of kidney measured by glomular filtration rate indicated mainly not significant kidney's impairment. Only in two women kidney stones essentially damaged renal function (Table 2). Men had higher and statistically significant BMI and WHR parameters (Table 1), compared with women. The waistlines of 50 % men were more than 102 cm. Bioelectrical Impedance Analysis test was performed on 42 patients with kidney stones. Only 7 participants had normal percentage of body fat but the total body water, as an estimate of hydration level, was insufficient in 35 persons. Results of quantitative analysis menu patients with nephrolithiasis are summarized in Table 3. Dietary energy intake in group of men was significantly higher than in the group of women which resulted from high intake of protein and fat in men's diets. Men also drank more fluids on a daily basis, compared with women, but in both groups this value was lower than recommended (more than 2.5 L per day) [9]. We did not find any correlation between total fluid intake and total body water intake. Meat products eaten every day were the main source of protein in diets. We observed positive correlation between dietary total protein intake and uric acid intake as well (Fig. 1) although body weight of patients was correlated with dietary fat intake (Fig. 2) and uric acid intake (Fig. 3). Furthermore, inconsiderable correlation was found between dietary fat intake and body fat mass (p = 0.0506, r = 0.51).
Discussion
The first episode of nephrolithiasis may appear even in childhood triggered by primary hiperoxaluria [10, 11] and in our study age range of patients with kidney stones was wide (23—76 years). Recurrent renal stone disease is very frequent and occurs in about 50 % stone formers
[13]. In most participants of the study stones recurred too and the most common type was oxalate salts just like in other studies [10, 14]. A family history of kidney stones enhanced the risk of development of the disease in individuals. Curhan et al. [13] in a cohort the Health Professionals Follow-up Study of 37 999 men showed that in male stone formers a family history of nephro-lithiasis was more common than in those without kidney stones. Our study indicated the same relation. Long-term stone formation with recurrences may increase the risk of chronic kidney failure leading to glomerulosclerosis and decreased glomular filtration rate by obstruct calyces and renal pelvis [15]. Two women in this study had very low GFR, which indicated almost end-stage renal disease. Overweight and obesity may stimulate renal stones formation. Positive correlations between body weight, BMI and nephrolithiasis can be found in many studies [16, 17]. Maalouf et al. [18] and Abate et al. [19] revealed that excess percentage body fat and insulin resistance lower pH in urine enhance the risk of uric acid kidney stones. In our study most patients had quite high value of BMI, WHR (particularly men) and body fat (particularly women). Diets of patients with kidney stones supplied low intakes of fluids, fibre and high intakes of protein, fat, especially in a group of men. Diets with insufficient participation of fluid stimulate salts crystallisation in urine and stone formation [20]. In this group additional lithegenic factor was type of beverages (first of all black tea and coffee), as we mentined in Roczn PZH [21]. Excess animal protein in our studyand positive correlation with dietary uric acid intake may acidify urine and cause hypercalciuria [19—22]. Giannini et al. [23] showed that 0.8 g protein/ kg/day significantly reduced serum and urinary urea values, similarly like urinary calcium and oxalate. Vegetarian diets, compared to the westerntype diets, decrease the risk of uric acid crystallisation by 93 % [24]. But Massey and Kynast-Gales [25] revealed a more important relationship between protein intake than the type of protein. Positive correlation between body weight of patients with kidney stones and fat intake implies that it could be the main cause of overweight and obesity and high percentage body fat among the participants. Additionally, higher uric acid consumption among patients with higher body weight can undoubtedly stimulate stone formation. On the other hand, fibre may protect from nephrolithiasis. Hess et al. [26] proved that fibre enhances urinary citrate
Table 1. Characteristics of patients with kidney stones
Men, n = 24 Women, n = 18 P
Age (years) 46.7 ± 16.5 51.1 ± 11.8 NS
WHR* 0.95 ± 0.05 0.82 ± 0.04 p < 0.05
Waist >102 cm > 88 cm
% 50 20
Mediana Mediana
BMI (kg/m2)** 27.9 25.6 p < 0.05
* — Student's t test, ** — Mann-Whitney test.
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excretion which dissolves calcium oxalate salts. However, in diets of our patients this nutrient was in insufficient intake as well, which indicates low consumption of fruit and vegetables. Low potassium and magnesium intake may stimulate stone formation by reduced reabsorption of calcium in tubule and decreased concentration of natural inhibitor of crystallisation of calcium oxalate, which is magnesium. Furthermore, among other nutritional litho-
p < 0.05; r = 0.78*
genic factors, which have been described by us in Roczn PZH [21], we can rate low diet intake of calcium, vitamin B6 and high intake of oxalic acid, vitamin C.
Conclusions
Nutrition can stimulate lithogenesis. Patients with kidney stones should have an opportunity to talk to dietitians about their nutritional habits and receive accurate dietetic recommendations.
Figure 1. Correletion between total protein intake and uric acid intake in diets patients with kidney stones (* — simple linear regression analysis)
Figure 2. Correlation between body weight of patients with kidney stones and dietary uric acid intake (* — simple linear regression analysis)
Table 2. Glomural filtration rate (GFR) of patients with kidney stones
GFR (ml/min/1,73 m2) 2 OC5 — S K (n = 18)
> 90 9 5
60-89 9 8
30-59 4 3
15-29 2 -
< 15 - 2
Table 3. Energy value and nutritional components of menu patients with kidney stones
Men Women P
Mean ± SD % RDA Mean ± SD % RDA
Fluids* (l) 2.4 ± 1.0 96 1.6 ± 0.7 64 < 0.05
Protein* (g) 68.4 ± 21.7 117.8 51.5 ± 15.5 99 < 0.05
Fat* (g) 80.5 ± 25.4 131 48.8 ± 14.2 105 < 0.05
SFA* (g) 30.4 ± 11.3 147 16.9 ± 5.3 110 < 0.05
MUFA* (g) 31.2 ± 10.4 139 18.5 ± 7.5 110 < 0.05
PUFA* (g) 12.6 ± 8.0 69 8.6 ± 4.9 63 < 0.05
n6* (g) 10.92 ± 7.50 89 7.2 ± 4.6 79 < 0.05
Carbohydrate (g) 222.9 ± 95.9 52.2 200.2 ± 56.9 59.3 NS
Potassium (mg) 2667.1 ± 1338.4 76.2 2361.2 ± 664.9 67.5 NS
Magnesium (mg) 252.0 ± 135.9 72 208.4 ± 64.8 74 NS
Uric acid (urine mg) * *** 452.6 ± 186.4 - 332.4 ± 84.9 - < 0.05
Mediana Mediana
Energy** (kcal) 1832.5 62.2 1375 64 < 0.05
n3 (g) 1.67 83 1.25 80 NS
n6/n3 4.97 - 4.74 - NS
Fibre (g) 15.2 60 16.9 67 NS
* — Student's t test; ** — Mann-Whitney test, *** — p < 0.05, r = 0.78, simple linear regression analysis.
p < 0.05; r = 0.58*
120 100
" 40
20
Oh-,-,-,-,-,-
0 20 40 60 80 100 120
Body weight (kg)
Figure 3. Correlation between body weight of patients with kidney stones and dietary fat intake (* — simple linear regression analysis)
Conflicts of interests. Authors declare the absence of any conflicts of interests that might be construed to influence the results or interpretation of their manuscript.
Reviewers: N. Zheltovska, PhD, Senior Research Fellow at the State institution "Institute of urology of the Ministry of Health of Ukraine" and Dmytro D. Ivanov, MD, PhD, Professor, Head of the Department of neph-rology and renal replacement therapy, Shupyk National Medical Academy of Postgraduate Education
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Received 09.10.2017 Received after review 20.10.2017 Accepted for publishing 21.10.2017
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Barbara Pyszczuk1, AnnaZiofkowska2
Warsaw University of Life Sciences, Warsaw, Poland
2Central Clinic Hospital of the Ministry of Interior and Administration in Warsaw, Diabetes Centre in Internal Diseases, Endocrinology and Diabetology Clinic, Warsaw, Poland
Основные литогенные факторы в рационе польских
Резюме. Актуальность. Питание является одной из важнейших причин появления камней в почках. Это исследование было разработано для оценки литогенных факторов в рационе пациентов с нефролитиазом. Материалы и методы. В исследование вошли 40 пациентов с мочекаменной болезнью, не имеющих метаболических нарушений, которые приводили бы к образованию камней (таких как гиперпаратиреоз, первичная гиперок-салурия). Проводились оценка антропометрических данных (индекс массы тела, соотношение окружностей талии и бедер), анализ композиционного состава тела (биоимпедансный анализ состава тела), качественный и количественный анализ пищевых привычек пациентов (3-дневная регистрация принимаемой пищи). Результа-
пациентов, страдающих от мочекаменной болезни
ты. У половины пациентов отмечались избыточный вес или ожирение. Их рацион содержал большое количество белка, жира, фосфора, витамина С и небольшое количество жидкости, кальция, магния, калия, витамина В6. Потребление белка положительно коррелировало с потреблением мочевой кислоты (г = 0,78), а масса тела — с уровнем жира в рационе (г = 0,58) и потреблением мочевой кислоты (г = 0,55). Выводы. Полный курс лечения по поводу нефролитиаза должен включать в себя диетотерапию. Отсутствие изменений в обычном рационе пациентов с мочекаменной болезнью может стимулировать процесс литогенеза.
Ключевые слова: мочекаменная болезнь; питание; избыточный вес; профилактика
Barbara Pyszczuk1, Anna Ziofkowska2
Warsaw University of Life Sciences, Warsaw, Poland
2Central Clinic Hospital of the Ministry of Interior and Administration in Warsaw, Diabetes Centre in Internal Diseases, Endocrinology and Diabetology Clinic, Warsaw, Poland
OcHOBHi niToreHHi $aKTopu b pa^oHi nonbCbKux na^eHTiB, flKi CTpawgaroTb Big cenoKaM'flHoi XBopo6u
Резюме. Актуальшсть. Харчування е одщею з найважли-вших причин появи каметв у нирках. Це дослвдження було розроблено для ощнки лггогенних фактор1в у ра-щош пащенпв iз нефролтазом. Матерiали i методи. У дослщження ввшшли 40 пащенпв iз сечокам'яною хворобою, яю не мали метаболiчних порушень, що приводили б до утворення камен1в (таких як гшерпаратиреоз, первинна гiпероксалурiя). Проводились ощнка антро-пометричних даних (шдекс маси тiла, сшвв1дношення окружностей тали та стегон), аналiз композицiйного складу тша (бiоiмпедансний аналiз складу тша), якiсний i кiлькiсний аналiз харчових звичок пацiентiв (3-денна реестрацiя ш, що приймаеться). Результати. У половини
пащенпв в1дм1чались надлишкова вага або ожиршня. 1х ращон мгстив велику кiлькiсть бшка, жиру, фосфору, вь тамшу С й невелику кшьюсть рщини, кальщю, магшю, калш, вггамшу В6. Споживання бiлка позитивно корелю-вало 1з споживанням сечово! кислоти (г = 0,78), а маса тша — 1з р1внем жиру в ращош (г = 0,58) [ споживанням сечово! кислоти (г = 0,55). Висновки. Повний курс лжу-вання 1з приводу нефролтазу повинен включати д1ето-тератю. Ввдсутшсть змш у звичайному ращош пащенпв 1з сечокам'яною хворобою може стимулювати процес ль тогенезу.
Ключовi слова: сечокам'яна хвороба; харчування; надлишкова вага; профшактика
