Developed and validated food frequency questionnaires in Iran: A systematic literature review

Higher dietary methyl donor micronutrient consumption is associated with higher muscle strength in adults: a cross-sectional study

Methyl donor micronutrients might affect muscle strength via DNA methylation. We aimed to evaluate the combined relationship of dietary methyl donor micronutrients containing betaine, choline, methionine, vitamin B12, vitamin B6 and folate on muscle strength. This cross-sectional study was conducted on 267 subjects including 113 men and 154 women. Dietary intake of micronutrients was assessed utilising a validated 168-item semi-quantitative FFQ, and methyl donor micronutrient score (MDMS) was calculated. The muscle strength of the participants was measured using a digital handgrip dynamometer. The association was determined using linear regression analysis. The mean age of participants was 36·8 ± 13·2 years. After taking into account potential confounding variables, there was no significant association between dietary methyl donor micronutrient score (MDMS) and the mean left-hand muscle strength (β: 0·07, se: 0·05, P = 0·07); however, the changes were significant in the mean right-hand muscle strength (β: 0·09, se: 0·04, P = 0·03). There was also a significant positive relationship between mean muscle strength and methyl donors' intake after fully adjusting for potential confounders (β: 0·08, se: 0·04, P = 0·04). In conclusion, our findings revealed that higher dietary methyl donor micronutrient consumption is associated with enhanced muscle strength. As a result, advice on a higher intake of methyl donor-rich foods including grains, nuts, dairy products and seafood might be recommended by dietitians as a general guideline to adhere to. Additional prospective studies are needed to confirm the findings.

A scoping review of dietary assessment questionnaires potentially suitable for assessing habitual dietary intake in the National Health and Nutrition Survey, Japan

This scoping review aimed to identify questionnaire-based dietary assessment methods for use in the National Health and Nutrition Survey (NHNS) in Japan. The search was conducted in three databases (PubMed, Web of Science, and Ichushi) to identify questionnaire such as food frequency questionnaire and dietary history questionnaire validated against dietary recalls or food records for the intakes of both food groups and nutrients among Japanese adults. Study quality was assessed based on previously developed criteria. We extracted the questionnaire characteristics and the design and results of the validation studies. We identified 11 questionnaires, with the number of food items ranging from 40 to 196, from 32 articles of good quality. In the validation studies, participants were aged 30-76 years and 90% of the articles used ≥3 d dietary records as reference. The number of nutrients and food groups with a group-level intake difference within 20% against the reference method ranged from 1 to 30 and 1 to 11, respectively. The range of mean correlation coefficients between questionnaire and reference methods were 0.35-0.57 for nutrients and 0.28-0.52 for food groups. When selecting a survey instrument in the NHNS from the 11 existing questionnaires identified in this study, it is important to select one with high group-level comparison and correlation coefficient values on the intended assessment items after scrutinizing the design and results of the validation study. This review may serve as a reference for future studies that explore dietary assessment tools used for assessing dietary intake in specific representative populations.

Empirically derived dietary patterns and postpartum depression symptoms in a large sample of Iranian women

BACKGROUND

Postpartum Depression (PPD) is a major depressive disorder that mainly begins within one month after delivery. The present study aimed to determine the relationship between dietary patterns and the occurrence of high PPD symptoms in women participating in the initial phase of the Maternal and Child Health cohort study, Yazd, Iran.

METHODS

This cross-sectional study was carried out in the years 2017-2019 included 1028 women after childbirth The Food Frequency Questionnaire (FFQ) and the Edinburgh Postnatal Depression Scale (EPDS) were study tools. The EPDS questionnaire was used to measure postpartum depression symptoms and a cut-off score of 13 was considered to indicate high PPD symptoms. The baseline data related to dietary intake was collected at the beginning of the study at the first visit after pregnancy diagnosis and the data related to depression, were collected in the second month after delivery. Dietary patterns were extracted by exploratory factor analysis (EFA). Frequency (percentage) and mean (SD) were used for description. Chi-square test, Fisher's exact test, independent sample t-test, and multiple logistic regression (MLR) were used for data analysis.

RESULTS

The incidence of high PPD symptoms was 24%. Four posterior patterns were extracted including prudent pattern, sweet and dessert pattern, junk food pattern and western pattern. A high adherence to the western pattern was associated with a higher risk of high PPD symptoms than a low adherence (OR_T3/T1: 2.67; p < 0.001). A high adherence to the Prudent pattern was associated with a lower risk of high PPD symptoms than a low adherence (OR_T3/T1: 0.55; p = 0.001). There are not any significant association between sweet and dessert and junk food patterns and high PPD symptoms risk (p > 0.05).

CONCLUSION

High adherence to prudent patterns was characterized by high intake of vegetables, fruit and juice, nuts and beans, low-fat dairy products, liquid oil, olive, eggs, fish, whole grains had a protective effect against high PPD symptoms, but the effect of western pattern was characterized by high intake of red and processed meats and organs was reverse. Therefore, it is suggested that health care providers have a particular emphasis on the healthy food patterns such as the prudent pattern.

Association between the Dietary Inflammatory Index with gallstone disease: finding from Dena PERSIAN cohort

OBJECTIVE

The Dietary Inflammatory Index (DII) is a documented nutritional tool for assessing diet-induced inflammation that has been linked to various diseases/outcomes. The association between DII and gallstone disease (GSD) is yet to be explored. The objective of this study was to examine the association between DII and GSD.

DESIGN

This cross-sectional study was conducted using the baseline phase data of the Dena PERSIAN cohort. The analysed data included demographic information, lifestyle variables, body mass index, diabetes and fatty liver history, and laboratory test results. The 113-item Food Frequency Questionnaire was used to estimate the dietary intake of participants and quantify the inflammatory potential of the individual's diet. DII score was analysed as a continuous and quartiles variables. Univariable and multivariate logistic regressions were used to investigate the relationship between GSD and DII scores .

RESULTS

Out of 3626 individuals entering the study, 173 (4.77%) had GSD. The median DII was -0.08 (IQR=0.18). In the unadjusted model, the odds of having GSD were significantly higher in the first and second quartiles of DII (anti-inflammatory diet) than in higher quartiles (proinflammatory diet). In the adjusted model, the odds of having GSD in the third and fourth quartiles of DII scores compared with the first quartile were OR=0.59 (95% CI 0.36 to 0.95) and OR 0.51 (95% CI 0.30 to 0.84), respectively.

CONCLUSION

The results of this study suggest that a proinflammatory diet is associated with a reduced chance of GSD. However, longitudinal studies are needed to examine the causal association.

Development, validity and reproducibility of a dish-based semi-quantitative food frequency questionnaire in Iran

BACKGROUND: The food frequency questionnaire (FFQ) is the method of choice for dietary assessment in epidemiological studies. FFQs focusing on mixed-dishes and simple food items are useful where mixed-dishes are an essential part of food consumption. OBJECTIVE: Regarding the fact that the nature of the Iranian diet is mixed-dish, the present study aimed to design and assess the validity and reproducibility of a dish-based semi-quantitative FFQ in the Iranian adult population. METHODS: A list of 302 food items was collected from four geographical areas around Iran. The validation study was conducted on 97 healthy adults. The FFQ was introduced at the beginning of the study and 10 months after; two three-day food records were collected during the study. Also, biomarkers including 24-hour urinary potassium and nitrogen, serum retinol, and alpha-tocopherol were measured. RESULTS: A 142-food-item FFQ was concluded. The correlation coefficient between the second FFQ and the second three-day food record ranged from 0.225 to 0.323 for macronutrients and 0.128 to 0.476 for micronutrients. The percentile agreements (same or adjacent quartile) between the two methods were more than 60% for all nutrients. The intraclass correlation coefficient between FFQs (except for vitamin E) ranged from 0.363 to 0.578. The correlation coefficient between the second FFQ and the second biomarker assessment was 0.241 for protein.