Background Investigating the effect of metabolic disorders on chronic kidney disease (CKD) in the presence or the absence of obesity is of great importance. This study aimed to examine the independent and joint relationships of obesity and metabolic syndrome (MetS) with CKD.  Methods  The present study was performed on 9,762 participants from the baseline phase of the Ravansar non- communicable diseases (RaNCD) study. Thereafter, the CKD was estimated by glomerular filtration rate (eGFR) using the Modification of Diet in Renal Disease (MDRD) equation. All the included participants were categorized into the following four phenotypes: metabolically healthy non-overweight/obesity (MHNO), metabolically unhealthy non-overweight/obesity (MUNO), metabolically healthy overweight/obesity (MHO), and metabolically unhealthy overweight/obesity (MUO). Finally, Logistic regression analysis was used to estimate the odds ratio (ORs). Results The mean age of the included participants was 47.33 ± 8.27 years old, %48.16 (4,701) of whom were men. As well, 1,058(10.84%) participants had CKD (eGFR less than 60 ml/min/1.73m2). The overweight/obesity was not significantly associated with odds of CKD. The odds of CKD in male subjects with MetS was 1.48 times higher than non-MetS ones (95% CI: 1.10, 2.01). After adjusting the confounders, the odds of CKD were 1.54 times (95% CI: 1.12, 2.11) higher in the MUNO and 2.22 times (95% CI: 1.44, 3.41) higher in the MUO compared to MHNO phenotype in male subjects. The odds of CKD in the MUNO and MUO was 1.31 times (95% CI: 1.10, 1.60) and 1.23 times (95% CI: 1.01, 1.54) higher than MHNO phenotype in female subjects, respectively. Conclusion The odds of CKD were higher in MUNO and MUO phenotypes. Therefore, lifestyle modification is recommended to control normal weight and healthy metabolism.

Background Most non-communicable diseases (NCDs) are associated to diet and inflammation. The Dietary Inflammatory Index (DII) is a developed and validated self-assessment tool. The study was conducted to assess the association of DII with the hypertension (HTN) and type 2 diabetes mellitus (T2DM). Methods This cross-sectional analysis was conducted on 9811 participants aged 35 to 65 years from the Ravansar Non-Communicable Diseases (RaNCD) cohort study’s baseline phase data. The DII was calculated using 31 food frequency questionnaire parameters (FFQ). Univariable and multiple logistic regression was used to derive the estimates. Results In healthy participants, the mean DII score was − 2.32 ± 1.60; in participants with T2DM, HTN, or T2DM&HTN, the mean DII score was − 2.23 ± 1.59, − 2.45 ± 1.60 and − 2.25 ± 1.60, respectively (P = 0.011). Males had a significantly higher pro-inflammatory diet than females (P <  0.001). BMI (body mass index), triglyceride, energy intake, smokers were significantly higher and socio-economic status (SES), physical activity and HDL-C were significantly lower in the most pro-inflammatory diet compared to the most anti-inflammatory diet. Participants with T2DM, HTN, and T2DM&HTN had significantly higher mean anthropometry indices (P <  0.001) and lipid profiles than healthy subjects (P <  0.001). After adjusting for age, gender, and physical activity, the probability of developing T2DM was 1.48 (95% CI: 1.19, 1.85) times greater in the fourth quartile of DII than in the first quartile. Conclusions The findings of this study showed that an anti-inflammatory diet are associated with HTN, T2DM, and the risk factors associated with these conditions. Modification of diet is recommended to reduce inflammation.

High BMI related burden of knee and hip osteoarthritis (OA) is on a significant rise worldwide. OA not only causes joint pain and stiffness, but it also leads to disability. This study investigated the trend and burden of OA attributable to high body mass index (BMI) in Iran. The age-standardized disability-adjusted life years (DALYs) rates of knee and hip OA due to high BMI, were estimated using data from the Global Burden of Disease 2019. We evaluated DALYs rate trend of high BMI related OA by sex and age in span of 30 years from 1990–2019 across the 31 provinces of Iran. The age-standardized prevalence trend of OA in the knee and hip showed an increase from 1990 to 2019. In 2019 there were 29.92 (95% CI: 10.98–64.92) and 42.50 (95% CI: 16.32–97.37) DALYs/100,000 related to OA from high BMI in men and women, respectively. 2019 saw the greatest DALYs/100,000 rate in the 65–79 age group. From 2005 to 2019, men and women saw DALYs/100,000 rate changes of 24.87 and 17.43 percent, respectively. The burden of knee OA was significantly higher than that of hip OA. DALYs rate of OA due to high BMI was found to be positively associated with the Socio-demographic Index (SDI). The burden of knee and hip OA due to high BMI has increased significantly in recent years in Iran among all age groups of both men and women. It is recommended that health policymakers develop weight control strategies to reduce the burden of OA and implement them at the national level.

Background: Dietary factors and inflammation are associated with most non-communicable diseases (NCDs). The Dietary Inflammatory Index (DII) is a developed validated assessment tool. This study was conducted to assessed association of DII with the hypertension and type 2 diabetes mellitus (T2DM). Methods: This cross-sectional analysis was performed on 9,811 participants of 35 to 65 years of the base-line phase data of Ravansar Non-Communicable Diseases (RaNCD) cohort study. The DII was calculated using 31 parameters food of food frequency questionnaire (FFQ). The estimates were performed using univariable and multivariable logistic regression.Results: The mean DII scores in healthy participants was -2.32± 1.60, in participant with T2DM, hypertension and both were -2.23± 1.59, -2.45± 1.60 and -2.25± 1.60, respectively (P= 0.011). Pre-inflammatory diet was significantly higher in male compared to female (P<0.001). In the most pro-inflammatory diet was significantly higher BMI (body mass index), triglyceride, energy intake, smokers; and was significantly lower socio-economic status (SES), physical activity and HDL-C compared to the most anti-inflammatory diet. Participants with T2DM, hypertension and comorbidity had a significantly higher mean of anthropometry indices (P<0.001) and lipid profile compared to healthy subjects (P<0.001). After adjustment for age, sex and physical activity, the odds of T2DM in the fourth quartile of DII was 1.48 (95% CI: 1.19, 1.85) times higher compared to the first quartile of DII. Conclusions: Pro-inflammatory diet was weak associations with hypertension. Pro-inflammatory diet was significant associations with increasing T2DM and its related risk factors. Modification of diet and lifestyle is suggested to reduce inflammation.

Background: Plant-based diet has antioxidant and anti-inflammatory properties. Therefore, this hypothesis is raised that following a plant-based diet may improve the functioning of the kidneys. The aim of study was to determine the association between plant-based diet index (PDI) and chronic kidney disease (CKD).Methods: This cross-sectional study was conducted using data from Ravansar non-communicable diseases (RaNCD) cohort study on 9,746 participants aged 35-65 years, in western Iran. CKD was assessed by glomerular filtration rate (eGFR) using the Modification of Diet in Renal Disease (MDRD) equation. The PDI was calculated based on food intake using a food frequency questionnaire (FFQ), and The food items were distributed into 18 food groups. We used multivariable logistic regression models to estimate odds ratio (ORs).Results: 1,058 (10.86%) of participants had CKD (eGFR<60 ml/min/1.73 m2), and the mean of PDI was 54.22± 6.68. The mean of eGFR in the group with high PDI score was significantly higher than the group with low PDI score (forth quartile: 79.20± 0.36 vs. first quartile: 72.95± 0.31, P<0.001). Adherence to a plant-based diet was more prevalent in the higher socioeconomic status (P<0.001). After adjusting for potential confounders, the odds of CKD in the third and fourth quartile of PDI was 25% (OR: 0.75; 95% CI: 0.62- 0.91) and 39% (OR: 0.61; 95% CI: 0.48- 0.78, P trend<0.001) lower than the first quartile, respectively.Conclusions: The findings of this study suggest that having a plant-based diet may be preventing the development of CDK. However, further studies are recommended.