Trialing a fruit and vegetable intervention to promote a healthy weight and reduce disease risk
A randomised controlled trial in healthy adults evaluating the impact of high and low carotenoid dietary patterns on diet quality, weight status and metabolic markers and validate the Australian Eating Survey
The University of Newcastle
120 participants
Sep 9, 2019
Interventional
Conditions
Summary
Only 5% of Australian adults meet the recommended intake of fruit & vegetables. Energy from discretionary foods contributes to one third of total energy intake. Together these dietary patterns contribute to the prevalence of overweight and obesity in Australia. This 6 month study will trial two dietary patterns aimed to increase fruit and vegetable consumption and subsequently decrease consumption of discretionary foods. Participants will be randomised to one of two fruit and vegetable eating patterns. All participants will receive 2 weeks worth of fruit and vegetables. The type of fruit and vegetables they receive will depend on the group they have been radomised into. Participants will also be supported via personalised dietary consultations which will be delivered intensively in the first three months and then less intensively (maintenance phase) in the second three months. Aim: Evaluate the effect of two dietary patterns on diet quality, body composition, skin & urinary carotenoids, blood lipids and glucose. 2. To validate the Australian Eating Survey (AES).
Eligibility
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Interventions
High carotenoid intake/high variety fruit & vegetable intake (ß-carotene content >50µg/100g). The fruits and vegetables included consist of carrots, sweet potato, pumpkin, red capsicum, lettuce, tomato, broccoli, cucumber, zucchini, frozen peas & corn, canned tomatoes, frozen mixed berries, bananas and oranges. There will be 28X 150g serves of fruit and 70X 75g serves of vegetables - In the first 2 weeks participants will be given 2 weeks worth of variety fruit and vegetables high in carotenoids will be determined by carotenoid content. To reduce bias participants will not be given this specific information. - In addition (during first 3 months): intervention phase = personalized dietary consultations (2 compulsory sessions and 1 optional consult) and emails (n=2) - In the following 3 months: maintenance phase = which includes personalized dietary consultations (2 optional consults) and emails (n=2). During the phase the intensity of the dietary consultations will reduce. The intervention components will be delivered by an Accredited Practicing Dietitian. Participants will be asked to used an image-based food record to self-monitor and self-report their intake, for 3 days in the week following the data collection sessions (2 weeks, 3 months and 6 months post baseline) The dietary consultations will follow a predetermined plan, based on the Behaviour Change Wheel. Briefly, the dietitian will review the Australian Eating Survey Report and responses to a Personalised Nutrition Questionnaire (PNQ) with participants. Personalised goals will be set and strategies to reach these goals will be discussed. These strategies will come from the Personalised Nutrition Toolbox which corresponds to the PNQ. A summary of the session and resources will be emailed to participants after the session. The optional sessions will review goals and strategies to determine if progress is being made or if goals/strategies need to be adjusted. Participants will be encouraged to book in for these sessions but it will be at their discretion if they want to attend all the optional follow up sessions. The emails will provide participants with encouragement by reminding them they have reached week 4, 8, 14 and 18 respectively. It will provide reminders about the aims of the study and dietary information on how they can maintain the fruit and vegetable eating patterns e.g. resource sheets and website links The resources and links will be ones that are already available and are sourced from government departments, the Dietitians Association of Australia, Nutrition Education Materials Online, Australian Healthy Food Guide and Practice Based Evidence in Nutrition.
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ACTRN12619001415190