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The association between dietary patterns and metabolic syndrome among Iranian adults, a cross-sectional population-based study (findings from Bandare-Kong non-communicable disease cohort study)

BMC Endocrine Disorders volume 24, Article number: 57 (2024) Cite this article

Abstract

Background

Metabolic syndrome is a cluster of metabolic disorders increasing the risk of cardiovascular disease and diabetes. Dietary patterns are supposed to be important and controllable factors in developing metabolic syndrome. The purpose of this study was to investigate the association of dietary patterns with metabolic syndrome and its components.

Subjects/Methods

Cross-sectional data were extracted from the Bandare-Kong cohort study conducted on 4063 people aged 35 to 70. Dietary patterns were extracted using principal component analysis based on thirty-eight pre-defined food groups. Multivariable logistic regression was conducted to investigate the association between metabolic syndrome and its components with quintiles of dietary patterns in crude and adjusted models.

Results

Three major dietary patterns were identified (healthy, western, and traditional) in the final analysis of 2823 eligible individuals. After adjusting for covariates, the odds of metabolic syndrome were significantly decreased by 46% in subjects with the highest adherence to the healthy dietary pattern compared to those with the lowest adherence quintile. Results from fully adjusted models on individual metabolic syndrome components showed an inverse association between higher adherence to the healthy dietary pattern and the odds of increased blood glucose, high waist circumference, and elevated blood pressure. However, in fully adjusted models, no significant association was observed between the western and traditional dietary patterns with odds of metabolic syndrome and its components.

Conclusions

Adherence to a healthy dietary pattern containing high amounts of fruits, vegetables, nuts, low-fat dairy products, and legumes, could be recommended to prevent and control metabolic syndrome.

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Introduction

Metabolic syndrome is a public health concern that affects approximately a quarter of all adults worldwide. It is not a disease but a cluster of metabolic disorders, increasing the risk of cardiovascular disease and stroke by up to two-fold and the risk of diabetes by up to five-fold [1]. According to NCEP-ATP III criteria, metabolic syndrome is defined as the presence of three of the following five indicators including elevated waist circumference (> 102 cm in men or > 88 cm in women), elevated blood pressure (systolic ≥ 130 and/or diastolic ≥ 85 mm Hg), elevated triglycerides (≥ 150 mg/dL), reduced high-density lipoprotein cholesterol (< 40 mg/dL in males; <50 mg/dL in females), and elevated fasting blood glucose (≥ 100 mg/dl) [2].

The importance of dietary regimens and specific nutrients in the pathophysiology of metabolic syndrome is well acknowledged [3]. Dietary habits are one of the most important lifestyle-related risk factors in this disorder and there is a growing interest in the study of dietary patterns as a whole instead of individual dietary components associated with metabolic syndrome which can be an effective step toward eliminating and preventing the condition [4,5,6]. Among the research in this field, we can mention a systematic review and meta-analysis of observational studies that showed adherence to a “healthy” dietary pattern (high consumption of fruit, vegetables, whole grains, poultry, fish, nuts, legumes, and low-fat dairy products) was associated with a reduced risk of metabolic syndrome, while a “meat/western” dietary pattern (rich in red and processed meat, eggs, refined grains, and sweets) was associated with an increased risk [7]. In a nutshell, recent evidence supports the protective effects of applying healthy food-based dietary patterns due to the sum of small dietary changes rather than the restriction of individual nutrients or calories [8].

Regional diversity in factors like dietary habits and disease prevalence provides a good opportunity to investigate such associations. As considering the geographic locations of the Bandare-Kong Non-Communicable Diseases (BKNCD) cohort study in a southern coastline of Iran with specific socio-demographic and lifestyle features in addition to the high prevalence of metabolic syndrome in this region (34%) [9], give us this view of examine the dominant dietary patterns and then analyzed whether these dietary patterns are associated with metabolic syndrome. It is important to note that no major studies have yet been conducted to determine dietary patterns in the southern of Iran, especially in coastal areas that are important in terms of seafood consumption. Consequently, this study was done to determine prevalent dietary patterns in the population of the BKNCD cohort study as besides aimed at investigating the relationship between the identified patterns and metabolic syndrome and its constituents.

Subjects and methods

Study population and data collection

This cross-sectional survey was performed using the baseline data of the BKNCD cohort study, conducted as part of a prospective epidemiological research study in Iran (PERSIAN) in Bandare-Kong, a harbor city, in the southernmost point of Iran. Participant recruitment was undertaken between October 2016 and November 2018. The protocol for the BKNCD cohort study is fully described in separate articles [10, 11]. The study involved 4063 adults between the ages of 35 and 70, and the statistical analysis was finally run for 2823 eligible individuals. Pregnant women, people with chronic diseases such as cardiovascular disease, diabetes, and cancer, as well as people with energy intakes less than 800 kcal and more than 4200 kcal, were excluded from the study. Demographic and socioeconomic status (age, gender, and employment status), smoking habits, and dietary intakes were collected in a face-to-face setting by trained interviewers.

Anthropometric measurements

Participants’ weight was measured with minimal clothing, using a mechanical scale (SECA, model 755, Germany) with an accuracy of 0.1 kg, and their height was measured without shoes using a non-stretch tape measure and with an accuracy of 0.5 cm. Body mass index (BMI) was obtained by dividing weight in kilograms by height in meters squared. Waist circumference (WC) was measured at the end of several consecutive natural breaths at a level parallel to the midpoint between the top of the iliac crest and the bottom margin of the last palpable rib, using a stretch-resistant tape. Hip circumference (HC) was also measured at the highest point of the buttocks using a flexible tapeline.

Physical activity

Physical activity was assessed using a validated questionnaire that recorded the daily activities reported by participants in the past year. The metabolic equivalent (MET) of each activity was extracted using a compendium of physical activities and was calculated over 24 h based on reported activities. The weekly average of physical activities, including leisure time, work, and sports activities, were collected as MET-min/week [12, 13].

Smoking definition

Smoking status of participants was categorized into smokers and non-smokers based on self-reported data by answering the question whether have smoked at least 100 cigarettes in their lifetime (yes/no) [14].

Dietary pattern assessment

The food intakes were obtained using a modified semi-quantitative food frequency questionnaire (FFQ) containing 132 food items [15]. The consumption of each food item per year was recorded according to its consumption pattern in the day, week, month, or year. In the next step, food intakes were converted into g/day for data analysis. The amount of energy and nutrients were received from the Nutritionist IV software. All data were entered into SPSS 25 software for analysis. In order to reduce complexity, 132 food items were classified into 38 food groups based on nutrient similarity and culinary usage. Then, dietary patterns were obtained using principal component analysis with varimax rotation based on 38 food groups. Dietary patterns were identified according to various factors, such as eigenvalues > 1, rotational factor load > 0.3, and clear inflection in the scree plot.

Blood pressure measurement and laboratory investigation

Blood pressure (BP) was measured twice after 5 min of rest using a standard mercury sphygmomanometer (Riester, CE 0124, Germany) while the person was sitting with the arm at the level of the heart, and the mean value was recorded. Participants were referred to the laboratory for the collection of blood samples. Enzymatic methods were used to measure fasting blood glucose, total cholesterol, triglycerides, low-density lipoprotein cholesterol (LDL-C), and high-density lipoprotein cholesterol (HDL-C) following a 12-hour fast.

Statistical analysis

All analyses were performed using SPSS (version 25) software. The quantitative variables were represented using means ± standard deviations (SD), and categorical variables were expressed using percentages. Analysis of variance and Chi-square tests were used to compare quantitative and qualitative variables across the quintiles of adherence to dietary patterns. A comparison of age, sex, and energy-adjusted micro- and macro-nutrients, as well as food groups’ intake according to quintiles of major dietary patterns, was performed using the ANCOVA test. Multivariable logistic regression was used to investigate the odds ratio (OR) with a 95% confidence interval (CI) of metabolic syndrome and its components among quintiles of dietary patterns in crude and adjusted models controlling for age, sex, energy intake, BMI, physical activity, education level, marital status, and smoking.

Results

The principal component analysis, based on 38 pre-defined food groups, identified three major dietary patterns explaining 21% of total variances as follows: healthy dietary pattern (high in vegetables, fruits, yellow vegetables, leafy green vegetables, cruciferous vegetables, nuts, tomatoes, dried fruits, olives, and dairy products), western dietary pattern (high in soft drinks, sweets and desserts, condiments, pizza, red meats, snacks, poultry, refined grains, mayonnaise, canned fish, eggs, processed meats, and high-fat dairy products) and traditional dietary pattern which was high in sugars, tea, salt, potatoes, hydrogenated fats, and coffee. The food groups and their relevant factor loadings for each posterior dietary pattern are presented in Supplementary Tables 1 and 2, respectively.

Among the 4063 participants of the BKNCD cohort study, 2823 (40.3% males and 59.7% females, aged 35 and 70) were included in the final analysis. Table 1 summarizes the general characteristics of participants across quintiles of identified dietary patterns. Those with the highest adherence to the healthy dietary pattern had higher weight, BMI, hip circumference (P < 0.001, for all), and waist circumference (P = 0.006). Individuals with the highest adherence to the western dietary pattern had higher weight (P < 0.001) but lower waist circumferences (P = 0.020) compared with the lowest. There were differences in age, level of physical activity, and marital status among the lowest and highest quintiles of the western and traditional dietary patterns (P < 0.05).

Table 1 General characteristics of study participants according to quintiles of adherence to major dietary patterns1
Full size table

Table 2 shows participants’ dietary intake in quintiles of the major dietary patterns. Subjects in the fifth quintile of the healthy dietary pattern had significantly higher intakes of energy, fruits, vegetables, legumes, dairy, nut, fiber, magnesium, calcium, vitamin C, B6, and B9 and lower intakes of processed meat and refined grains compared with those in the first quintile. Also, with more adherence to the western dietary pattern, fruits, nuts, dairy products, fiber, trans fatty acids, calcium, vitamin C, B6, and B9 intakes tended to decrease and the intakes of energy, processed meat, refined grain, and saturated fat were increased.

Table 2 Comparison of age, sex, and energy-adjusted micro- and macro-nutrients, as well as food groups’ intake according to quintiles of major dietary patterns1
Full size table

Table 3 shows the odds ratio of abnormal levels of metabolic syndrome components according to quintiles of dietary patterns. The fully adjusted model indicated decreased odds ratio of high blood glucose in those with the highest adherence to the healthy dietary pattern compared with those with the lowest adherence quintile (OR = 0.56, 95% CI: 0.37, 0.86, P = 0.011). Also, an inverse association between the adherence to the healthy dietary pattern and the odds ratio of increased waist circumference (OR = 0.28, 95% CI: 0.14, 0.56, P = 0.001) and elevated blood pressure (OR = 0.51, 95% CI: 0.27, 0.93, P = 0.008). However, higher adherence to this healthy dietary pattern was not associated with the odds ratio of high TG and low HDL levels. The metabolic syndrome components were not significantly different across quintiles of the western and traditional dietary patterns.

Table 3 The odds ratio of abnormal levels of metabolic syndrome components1 according to quintiles of dietary patterns in multivariable-adjusted model2
Full size table

Table 4 shows the odds ratio of metabolic syndrome according to quintiles of dietary patterns. There was no significant association between the healthy dietary pattern and the odds ratio of metabolic syndrome in the crude and adjusted model 1. However, in the fully adjusted model for age, sex, energy intake, BMI, physical activity, education level, marital status, and smoking, the odds ratio of metabolic syndrome was significantly decreased by 46% in subjects at the highest quintile of the healthy dietary pattern compared to those at the lowest quintile (OR = 0.54, 95% CI: 0.35, 0.84, P trend = 0.032). For the western dietary pattern, although an inverse association was observed in the fourth and fifth quintiles in the crude analysis, this dietary pattern was not significantly associated with the odds ratio of metabolic syndrome after adjusting for age, sex, and energy intake, as well as in the fully adjusted model. For the traditional dietary pattern, a considerable association with metabolic syndrome was observed neither in crude nor in adjusted models.

Table 4 The odds ratio of metabolic syndrome according to quintiles of dietary patterns1
Full size table

Discussion

This cross-sectional study was the first to examine the association between major dietary patterns and metabolic syndrome in a large sample of Iranian subjects in the coastal southern area. We identified three major dietary patterns (healthy, western, and traditional) among this population. We observed that the healthy dietary pattern characterized by a high consumption of vegetables, fruits, nuts, olives, and dairy products was associated with a 46% reduction in metabolic syndrome. This healthy pattern also showed an inverse association with abnormal individual metabolic syndrome components such as blood glucose, waist circumference, and blood pressure. The present findings are generally consistent with several previous research suggesting a healthy dietary pattern (rich in fruits, vegetables, nuts, dairy, and legumes) protects against metabolic syndrome [16,17,18], however, there is also evidence that has not found an association between healthy/prudent dietary patterns and metabolic syndrome [19,20,21,22].

Our participants with higher adherence to the healthy dietary pattern had higher intakes of fruits, vegetables, legumes, nuts, dairy products, fiber, magnesium, vitamin C, B6, and B9 and lower intakes of saturated fat, refined grains, and processed meats which can be attributed to the effectiveness of this pattern in improving metabolic syndrome components. The independent protective effects of low intake of food items such as refined grain [23] and saturated fatty acid (from processed meats) [24], and high intake of complex carbohydrates [23], fruits and vegetables [25], nuts [26], and legumes [27] has been strongly supported by evidence. It has been suggested that fruits, vegetables, and legumes which are rich in magnesium, fiber, and vitamin C play roles in reducing the risk of metabolic syndrome [28,29,30]. The dairy products high in calcium in a healthy dietary pattern, is also supposed to be effective in reducing abdominal obesity and lowering blood pressure [31, 32]. Moreover, a healthy diet with a low glycemic load can be associated with a reduced risk of insulin resistance as a key mediator of metabolic syndrome [33]. In general, the protective effect of plant-based dietary indices has been shown on metabolic syndrome [34]. There is a strong body of evidence to support that adherence to different types of healthy dietary patterns which contain high amounts of fruits, vegetables, whole grains, dairy products, nuts, and legumes could be effective in improving the components of metabolic syndrome in particular blood glucose control and blood pressure [35,36,37,38,39,40].

Our data did not show a different chance of metabolic syndrome according to quintiles of adherence to the western dietary pattern. This finding is in line with several studies that did not find a significant association between the western dietary pattern and metabolic syndrome and its components [17, 41,42,43]. The main food items in the western dietary pattern such as red meats, processed meats, proteins, fats, and saturated fats have resulted in a reduction of carbohydrate and sugar intakes in this pattern [41]. It is consequently possible that it has caused no significant inverse association of the western dietary pattern with metabolic syndrome. Our results also showed that the traditional dietary pattern with high content of sugar, tea, salt, potatoes, hydrogenated fats, and coffee were not associated with metabolic syndrome. This pattern is similar to the dietary pattern of high fat, sweets, and coffee found in the Kim et al. study among South Korean adults, which also indicated no significant correlation with metabolic syndrome [44].

We must point out the limitation of this study which was its cross-sectional design, because since these type of studies are helpful in assessing individuals’ dietary patterns, they cannot establish a causal and temporal relationship between dietary patterns and health outcomes. Moreover, the dietary intakes were assessed by using a semi-quantitative FFQ, which is prone to measurement error. The non-completion of the Iranian food composition table of Iran made us use the US Department of Agriculture (USDA) data bank in this study. The findings may also not be generalizable or produce an accurate description of all populations, however, we tried to consider many potential confounders in the data analysis.

Conclusions

This cross-sectional study on Iranian adults in the coastal southern area revealed that a healthy dietary pattern is associated with a reduced risk of metabolic syndrome and its components, such as elevated waist circumference, high blood pressure, and high fasting blood sugar. It therefore seems that adherence to a healthy dietary pattern that includes fruits, vegetables, nuts, dairy, and legumes can be recommended in improving metabolic factors related to metabolic syndrome as a promising lifestyle strategy. Longitudinal studies are still needed to confirm our results in different populations.

Data availability

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

Abbreviations

BKNCD:

Bandare-Kong Non-Communicable Diseases

BMI:

Body mass index

BP:

Blood pressure

CI:

Confidence interval

FFQ:

Food frequency questionnaire

HC:

Hip circumference

HDL-C:

High-density lipoprotein cholesterol

LDL-C:

Low-density lipoprotein cholesterol

MET:

Metabolic equivalent

NCEP-ATP III:

National Cholesterol Education Program Adult Treatment Panel III

OR:

Odds ratio

PERSIAN:

Prospective Epidemiological Research Studies in Iran

SD:

Standard deviations

WC:

Waist circumference

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Acknowledgements

The BKNCD cohort study is a part of the PERSIAN national cohort, and we would like to thank Professor Reza Malekzadeh, Deputy of Research and Technology at the Ministry of Health and Medical Education of Iran and Director of the PERSIAN cohort, and also Dr. Hossein Poustchi, Executive Director of the PERSIAN cohort, and Professor Azim Nejatizadeh, Director of the BKNCD cohort study, for all their supports during design and running of this project. Furthermore, we would like to express our gratitude to the BOND’s personnel and population for their support.

Funding

The present study was funded by the Hormozgan University of Medical Sciences, Iran.

Author information

Authors and Affiliations

  1. Endocrinology and Metabolism Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran

    Masoumeh Kheirandish & Abnoos Azarbad

  2. Food Health Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran

    Farideh Dastsouz, Gholamali Javdan, Farkhondeh Razmpour, Nahid Ramezani-Jolfaie & Mohammad Mohammadi

  3. Department of Clinical Nutrition, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran

    Mohammad Ali Mohsenpour

  4. Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran

    Mohammad Ali Mohsenpour

  5. Department of Community Medicine, School of Medicine, Hormozgan University of Medical Sciences, Bandar Abbas, Bandar Abbas, Iran

    Gholamali Javdan, Farkhondeh Razmpour, Nahid Ramezani-Jolfaie & Mohammad Mohammadi

  6. Department of Clinical Nutrition, School of Nutritional Sciences and Food Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran

    Seyed Hossein Davoodi

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Contributions

MK and MM contributed to the study design and supervision. GJ, FR, SHD, and NRJ were consulted on the possible associated factors to be considered. MM performed the statistical analysis. MK, FD, AA, and MAM wrote the manuscript. MM and NRJ revised the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Mohammad Mohammadi.

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Kheirandish, M., Dastsouz, F., Azarbad, A. et al. The association between dietary patterns and metabolic syndrome among Iranian adults, a cross-sectional population-based study (findings from Bandare-Kong non-communicable disease cohort study). BMC Endocr Disord 24, 57 (2024). https://doi.org/10.1186/s12902-024-01584-7

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BMC Endocrine Disorders

ISSN: 1472-6823

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