Kerith Duncanson

Reproducibility and comparative validity of a food frequency questionnaire for Australian adults

BACKGROUND Food frequency questionnaires (FFQ) are used in epidemiological studies to investigate the relationship between diet and disease. There is a need for a valid and reliable adult FFQ with a contemporary food list in Australia. AIMS To evaluate the reproducibility and comparative validity of the Australian Eating Survey (AES) FFQ in adults compared to weighed food records (WFRs). METHODS Two rounds of AES and three-day WFRs were conducted in 97 adults (31 males, median age and BMI for males of 44.9 years, 26.2 kg/m(2), females 41.3 years, 24.0 kg/m(2). Reproducibility was assessed over six months using Wilcoxon signed-rank tests and comparative validity was assessed by intraclass correlation coefficients (ICC) estimated by fitting a mixed effects model for each nutrient to account for age, sex and BMI to allow estimation of between and within person variance. RESULTS Reproducibility was found to be good for both WFR and FFQ since there were no significant differences between round 1 and 2 administrations. For comparative validity, FFQ ICCs were at least as large as those for WFR. The ICC of the WFR-FFQ difference for total energy intake was 0.6 (95% CI 0.43, 0.77) and the median ICC for all nutrients was 0.47, with all ICCs between 0.15 (%E from saturated fat) and 0.7 (g/day sugars). CONCLUSIONS Compared to WFR the AES FFQ is suitable for reliably estimating the dietary intakes of Australian adults across a wide range of nutrients.

The Comparative Validity and Reproducibility of a Diet Quality Index for Adults: The Australian Recommended Food Score

Adult diet quality indices are shown to predict nutritional adequacy of dietary intake as well as all-cause morbidity and mortality. This study describes the reproducibility and validity of a food-based diet quality index, the Australian Recommended Food Score (ARFS). ARFS was developed to reflect alignment with the Australian Dietary Guidelines and is modelled on the US Recommended Food Score. Dietary intakes of 96 adult participants (31 male, 65 female) age 30 to 75 years were assessed in two rounds, five months apart. Diet was assessed using a 120-question semi-quantitative food frequency questionnaire (FFQ). The ARFS diet quality index was derived using a subset of 70 items from the full FFQ. Reproducibility of the ARFS between round one and round two was confirmed by the overall intraclass correlation coefficient of 0.87 (95% CI 0.83, 0.90), which compared favourably to that for the FFQ at 0.85 (95% CI 0.80, 0.89). ARFS was correlated with FFQ nutrient intakes, particularly fiber, vitamin A, beta-carotene and vitamin C (0.53, 95% CI 0.37–0.67), and with mineral intakes, particularly calcium, magnesium and potassium (0.32, 95% CI 0.23–0.40). ARFS is a suitable brief tool to evaluate diet quality in adults and reliably estimates a range of nutrient intakes.

Parents' perceptions of child feeding: a qualitative study based on the theory of planned behavior

Objective: The aim of this qualitative study was to investigate the child-feeding behaviors and attitudes of parents of children aged 2 to 5 years, within the theory of planned behavior (TPB) framework. Methods: Semistructured telephone interviews were conducted in October 2011. The interviewer conducted and recorded the interviews from a community health center, to interviewees who were in their own home environment. Verbatim transcription of interviews preceded manual coding of data. Emergent themes were mapped into a matrix against a priori-coded TPB constructs (attitudes, beliefs, subjective norms, perceived behavioral control, and behavioral intention). Results: Twenty-one consenting parents participated in interviews. Participants were predominantly tertiary-educated (65%) mothers (85%) who were older than 30 years (76%). Parents believed that optimal child nutrition is important but difficult to achieve. Behavioral intention to change feeding practices was limited by a belief that child’s dietary intake is above average compared with their peer group. Perceived control over child dietary intake was influenced by food advertising, extended family, and peer influences. Parents supported targeting nutrition education directly at children and a policy approach to offset the costs of fresh foods by taxing “junk” foods. Conclusions: The application of TPB to child feeding may explain the disparity between parents’ child-feeding intentions and behaviors. Parents’ feeding behaviors are more influenced by peers than by dietary guidelines. Future interventions need to target parents’ perceived child-feeding responsibilities, influence subjective norms, and increase parents’ perceived control over child feeding. Peer nutrition education is proposed as an intervention model.

Child Feeding and Parenting Style Outcomes and Composite Score Measurement in the ‘Feeding Healthy Food to Kids Randomised Controlled Trial’

Child feeding practices and parenting style each have an impact on child dietary intake, but it is unclear whether they influence each other or are amenable to change. The aims of this study were to measure child feeding and parenting styles in the Feeding Healthy Food to Kids (FHFK) Randomized Controlled Trial (RCT) and test a composite child feeding score and a composite parenting style score. Child feeding and parenting style data from 146 parent-child dyads (76 boys, aged 2.0–5.9 years) in the FHFK study were collected over a 12-month intervention. Parenting style was measured using parenting questions from the Longitudinal Study of Australian Children and the Child Feeding Questionnaire (CFQ) was used to measure child feeding practices. Data for both measures were collected at baseline, 3 and 12 months and then modelled to develop a composite child feeding score and a parenting score. Multivariate mixed effects linear regression was used to measure associations between variables over time. All child feeding domains from the CFQ were consistent between baseline and 12 months (p < 0.001), except for monitoring (0.12, p = 0.44). All parenting style domain scores were consistent over 12 months (p < 0.001), except for overprotection (0.22, p = 0.16). A significant correlation (r = 0.42, p < 0.0001) existed between child feeding score and parenting style score within the FHFK RCT. In conclusion, composite scores have potential applications in the analysis of relationships between child feeding and dietary or anthropometric data in intervention studies aimed at improving child feeding or parenting style. These applications have the potential to make a substantial contribution to the understanding of child feeding practices and parenting style, in relation to each other and to dietary intake and health outcomes amongst pre-school aged children.

Effect of a low-intensity parent-focused nutrition intervention on dietary intake of 2- to 5-year olds.

Objectives: Community-based nutrition interventions aimed at influencing child dietary intake are rarely evaluated. We hypothesised that providing self-directed nutrition and parenting resources to parents living in rural northern New South Wales, Australia, would positively affect the dietary patterns of children ages 2 to 5 years. Methods: A total of 146 parent–child dyads (76 boys, ages 2.0–5.9 years) were randomly assigned to either a 12-month parent-centred intervention involving self-directed education provided in CD and DVD formats, or a participant-blinded control group who received generic nutrition and physical activity information. Data were collected at baseline, 3, and 12 months. Results: Total reported energy from nutrient-dense food groups and percentage energy from energy-dense, nutrient-poor foods were high at baseline relative to estimated total energy expenditure for child age. Using random effects modelling, there were significant group-by-time effects for a reduction in mean (standard deviation) total energy intake (EI) at 12 months (−461 kJ/day (196); P = 0.04). An intervention group-by-time effect on carbohydrate intake (−17.4 g/day (10.6); P < 0.05) was largely attributable to decreased consumption of breads and cereals (−180 g/day (80); P = 0.007). Decreases in energy-dense, nutrient-poor foods were not statistically significant. Conclusions: The proportion of total EI from noncore foods in children in rural New South Wales is high and did not improve in response to a low-intensity nutrition intervention. Parents reported small changes in consumption frequency for core and noncore food intakes, leading to a reduction in total EI. Strategies to increase resource use such as prompting via e-mail are required to further explore the effectiveness of nutrition resource dissemination at a population level.

Peer education is a feasible method of disseminating information related to child nutrition and feeding between new mothers

BackgroundThis study examined whether peer education based on the Theory of Planned Behaviour is a feasible method to share and disseminate nutrition and feeding information between mothers of babies and toddlers.MethodsThe Peer Educator Nutrition Training (PeerENT) study was a feasibility study. Participants were recruited from an existing cohort of mothers of six month to two year olds. An online survey tool was used to collect and collate data, which was then analysed using STATA statistical software.ResultsThirty four mothers (35%) responded to the survey with 76% (n = 26) either very interested (n = 13) or interested (n = 13) in receiving child nutrition information from a trained peer educator, preferably in a structured group session. Sixty five per cent (n = 22) were “interested” or “very interested” in becoming a peer nutrition educator. The preferred methods of communicating information to other parents were online (n = 17), informally in a social group (n = 16) and via a face-to-face group program (n = 14). Participants predicted they would share child nutrition information with an average of fifteen people, a total reach of 510 individuals.ConclusionsHigh levels of interest in peer educator training and the capacity for mothers to share resources widely and easily via social media offers a potential opportunity to disseminate evidence-based nutrition information. A pilot study investigating the impact of a well-designed, theory-based peer nutrition education program on the child feeding practices of mothers with children aged between six months to two years is warranted.

Study protocol of a parent-focused child feeding and dietary intake intervention: the feeding healthy food to kids randomised controlled trial

BackgroundPoor childhood nutrition is a more pervasive and insidious risk factor for lifestyle-related chronic disease than childhood obesity. Parents find it difficult to address the reported barriers to optimal child feeding, and to improve child dietary patterns. To impact at the population level, nutrition interventions need to be easy to disseminate, have a broad reach and appeal to parents while overcoming the barriers parents face when trying to improve child feeding behaviours. The Feeding Healthy Food to Kids (FHFK) Randomised Control Trial (RCT) examines the impact of providing low cost, self-directed nutrition and parenting resources to rural parents, on child dietary intake and parent–child feeding practices.Methods/DesignUp to 150 parents of two-to-five year old children will be recruited in five rural Australian towns. Eligible, consenting parents will be randomly allocated to intervention or 12-month wait-list control groups. Intervention group parents will receive an interactive nutrition CD and parenting DVD, and be provided with instructions for optimal resource utilisation. Intervention and control group participants will also receive a generic nutrition and physical activity brochure and a physical activity resource to blind participants to group allocation. Primary outcome measures are dietary intake of vegetables (serves/day), fruit and energy dense nutrient poor foods (serves/day and %Energy). Secondary outcome measures are total energy (kCal), other food groups (serves/day and %Energy), key nutrients (mg/day), child feeding domains and parenting style domains.Analysis of dietary outcome measures, child feeding and parenting domains will be conducted on an intention-to-treat basis and compared at baseline, three and 12 months using the random effects model, using STATA software. Details of the methodological aspects of recruitment, inclusion criteria, randomisation and statistical analysis are described.DiscussionThis paper will add to existing research examining child feeding practices and dietary intake of young children, by specifically focusing on the efficacy of an RCT that has the potential to be implemented at a population level. The correlation of the RCT outcomes with parents’ perceptions about child feeding practices and children’s dietary intake of their children in a subsequent qualitative study will further contribute to this emerging area of research.Trial registrationAustralian Clinical Trials Registration Number: ACTRN12609000356268

Food and functional dyspepsia: a systematic review

BACKGROUND Functional dyspepsia (FD) is a debilitating functional gastrointestinal disorder characterised by early satiety, post-prandial fullness or epigastric pain related to meals, which affects up to 20% of western populations. A high dietary fat intake has been linked to FD and duodenal eosinophilia has been noted in FD. We hypothesised that an allergen such as wheat is a risk factor for FD and that withdrawal will improve symptoms of FD. We aimed to investigate the relationship between food and functional dyspepsia. METHODS Sixteen out of 6451 studies identified in a database search of six databases met the inclusion criteria of studies examining the effect of nutrients, foods and food components in adults with FD or FD symptoms. RESULTS Wheat-containing foods were implicated in FD symptom induction in six studies, four of which were not specifically investigating gluten and two that were gluten-specific, with the implementation of a gluten-free diet demonstrating a reduction in symptoms. Dietary fat was associated with FD in all three studies that specifically measured this association. Specific foods reported as inducing symptoms were high in either natural food chemicals, high in fermentable carbohydrates or high in wheat/gluten. Caffeine was associated with FD in four studies, although any association with alcohol was uncertain. CONCLUSIONS Wheat and dietary fats may play key roles in the generation of FD symptoms and reduction or withdrawal eased symptoms. Randomised trials investigating the roles of gluten, FODMAPs (fermentable oligosaccharide, disaccharide, monosaccharide and polyols) and high fat ingestion and naturally occurring food chemicals in the generation of functional dyspepsia symptoms are warranted and further investigation of the mechanisms is now required.

Consumer Understanding, Perception and Interpretation of Serving Size Information on Food Labels: A Scoping Review

The increase in packaged food and beverage portion sizes has been identified as a potential factor implicated in the rise of the prevalence of obesity. In this context, the objective of this systematic scoping review was to investigate how healthy adults perceive and interpret serving size information on food packages and how this influences product perception and consumption. Such knowledge is needed to improve food labelling understanding and guide consumers toward healthier portion size choices. A search of seven databases (2010 to April 2019) provided the records for title and abstract screening, with relevant articles assessed for eligibility in the full-text. Fourteen articles met the inclusion criteria, with relevant data extracted by one reviewer and checked for consistency by a second reviewer. Twelve studies were conducted in North America, where the government regulates serving size information. Several studies reported a poor understanding of serving size labelling. Indeed, consumers interpreted the labelled serving size as a recommended serving for dietary guidelines for healthy eating rather than a typical consumption unit, which is set by the manufacturer or regulated in some countries such as in the U.S. and Canada. Not all studies assessed consumption; however, larger labelled serving sizes resulted in larger self-selected portion sizes in three studies. However, another study performed on confectionary reported the opposite effect, with larger labelled serving sizes leading to reduced consumption. The limited number of included studies showed that labelled serving size affects portion size selection and consumption, and that any labelled serving size format changes may result in increased portion size selection, energy intake and thus contribute to the rise of the prevalence of overweight and obesity. Research to test cross-continentally labelled serving size format changes within experimental and natural settings (e.g., at home) are needed. In addition, tailored, comprehensive and serving-size-specific food literacy initiatives need to be evaluated to provide recommendations for effective serving size labelling. This is required to ensure the correct understanding of nutritional content, as well as informing food choices and consumption, for both core foods and discretionary foods.

The effect of the labelled serving size on consumption: A systematic review

Guidance for food consumption and portion control plays an important role in the global management of overweight and obesity. Carefully conceptualised serving size labelling can contribute to this guidance. However, little is known about the relationship between the information that is provided regarding serving sizes on food packages and levels of actual food consumption. The aim of this systematic review was to investigate how serving size information on food packages influences food consumption. We conducted a systematic review of the evidence published between 1980 and March 2018. Two reviewers screened titles and abstracts for relevance and assessed relevant articles for eligibility in full-text. Five studies were considered eligible for the systematic review. In three of the included studies, changes in serving size labelling resulted in positive health implications for consumers, whereby less discretionary foods were consumed, if serving sizes were smaller or if serving size information was provided alongside contextual information referring to the entire package. One study did not find significant differences between the conditions they tested and one study suggested a potentially negative impact, if the serving size was reduced. The influence of labelled serving size on consumption of non-discretionary foods remains unclear, which is partially due to the absence of studies specifically focusing on non-discretionary food groups. Studies that investigate the impact of serving size labels within the home environment and across a broad demographic cross-section are required.