Background: To plan for decreasing the prevalence of malnutrition among children, reliable data of current status are required. The aim of the present cross-sectional study was to estimate the prevalence and trend of malnutrition among Iranian children. Methods: PubMed, ISI Web of Science, Scopus, Google Scholar, and Iranian databases including SID and Magiran were searched for studies published prior to October 2017 with MeSH terms of Malnutrition, Nutrition Disorders, Wasting, Stunting, Underweight, Undernutrition, Nutrition, Anthropometry, Weight, and Children and Iran. Three random effect models were applied to estimate the pooled prevalence of underweight, stunting, and wasting. Meta-regression and cumulative meta-analysis were performed. All analyses were also conducted separately for two different age groups including 0–6 years old (preschool) and 7–11 years old (primary school). Seventy-five studies (information of 1,069,815 individuals) were included in the final meta-analysis. Results: The overall prevalence of underweight, stunting, and wasting was estimated to be 8.4% [95% confidence interval (CI): 7.6–9.1], 14.5% (95% CI: 13.1–15.9) and 5.6% (95% CI: 5–6.2) in children age 0–6 years, and 6.6% (95% CI: 4.8–8.4), 7.3% (95% CI: 5.6–9.1), and 8.3% (95% CI: 6–10.7) in children age 7–11 years, respectively. Conclusions: The cumulative meta-analysis showed a decrease in the general trend of malnutrition in both preschool and primary school children of Iran. Stunting and wasting were the most common form of malnutrition in Iranian preschool and primary school children, respectively. The decreasing trend of malnutrition was much more noticeable about stunting.

Background: Obesity is related to increase in the incidence of morbidity and mortality. Previous studies have led to conflicting results regarding the effect of coenzyme Q10 (CoQ10) supplementation on anthropometric indices. This study aimed to evaluate the efficacy of CoQ10 supplementation on body weight, body mass index (BMI), and waist circumference (WC) through a systematic review and meta-analysis of randomized controlled trials (RCTs). Methods: PubMed, Scopus, Web of Science, and Cochrane Library as well as the reference lists of the identified relevant RCTs were searched up to March 2019, and weighted mean differences (WMDs) were pooled by using the random-effects model. Results: Twenty RCTs (976 participants) were eligible to be included in the systematic review. The meta-analysis revealed that CoQ10 supplementation had no effect on body weight (WMD = −0.04 kg; 95% confidence interval [CI]: −1.96, 1.6; I² = 0.0%), BMI (WMD = −0.06 kg/m²; 95% CI: −0.54, 0.42; I² = 0.0%), and WC (WMD = 0.79 cm; 95% CI: −2.83, 0.04; I² = 0.0%). Conclusions: CoQ10 supplementation might not improve anthropometric indices. Future well-designed trials are still needed to confirm these results.