A Personal Nutrition Advisor to Assist Remote Dietary Counselling for Weight Loss and Maintenance
- Conditions
- Obesity
- Interventions
- Other: Personal Nutrition Advisor
- Registration Number
- NCT05997771
- Lead Sponsor
- Lia Bally
- Brief Summary
The purpose of the study is to assess the usability of the PNA and satisfaction with the treatment within the framework of usual care remote nutritional counselling for GLP-1-supported weight management and collect pilot data on its potential to support weight loss.
- Detailed Description
The global prevalence of obesity and overweight is increasing and persistently drives global mortality and morbidity.As overweight and obesity are the result of an imbalance between energy intake and energy use, achieving a negative energy balance build the foundation for weight loss. Whilst dietary modification as a standalone procedure often fail in achieving or maintaining weight loss, the recent advent of supportive Glucagon-like Peptide-1 (GLP-1) based pharmacotherapies have greatly changed the landscape.Dietary counselling help people on GLP-1 based treatment reaching their individual weight goals and continued reimbursement of medication costs. However, nutritional advice provided by dietitians is often generic, not sufficiently aligned to individual weight loss trajectories.
The "Personal Nutrition Advisor" (PNA) is a decision support tool which is built upon an interpretable weight prediction model based on the energy balance equation (energy intake is a function of recorded dietary intake and a latent part dependent on observed weight changes, whereas energy expenditure is a function of weight and physical activity). Food, weight- and activity records captured using a smartphone application represent input data to the model. Output of the model is the predicted body weight trajectory alongside with personalized recommendations to reach a pre-defined target weight.
Integrating the PNA into a remote dietary counselling programme, in which certified dietitians deliver nutritional and lifestyle coaching via an application, has the potential to improve treatment satisfaction and efficacy. Therefore, the purpose of the study assess the usability of the PNA and satisfaction with the treatment within the framework of usual care remote nutritional counselling for GLP-1-supported weight management and collect pilot data on its potential to support weight loss.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 81
- Written informed consent
- Receiving GLP-1-based pharmacotherapy in combination with remote nutritional counselling
- Achieved weight loss of ≥5 (for baseline BMI 28-35 kg/m2) or ≥7% (for baseline BMI≥35kg/m2) after 4 months of GLP-1 based therapy (1st milestone)
- Inability to give written informed consent
- Any physical or psychological disease or condition likely to interfere with the normal conduct of the study and interpretation of the study results
- Self-reported pregnancy, planed pregnancy within next 3 months or breast-feeding
- Concomitant participation in another trial that interferes with the normal conduct of the study and interpretation of the study results
- Not proficient in German
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description Study Intervention Group Personal Nutrition Advisor The study intervention group will be undergoing 3 months of Personalized Nutrition Advisor (PNA)-assisted remote nutritional counselling.The PNA data analysis tool will be used by the dietitians during remote nutritional counselling sessions.The service will be delivered to patients undergoing GLP-1 based obesity treatment as part of their usual care. The study intervention group will report treatment-satisfaction and self-efficacy via questionnaires at baseline, 1.5 - and 3 months. Patients who expressed their interest in participating in a focus group at the time of study inclusion, will be invited for a 60 min online interview session chaired by an experienced moderator. The focus group will consists of a maximum of 10 participants and address the patient's perspective on the utility of the dietitians' advice, discrepancy from expectations, general feedback and suggestions for PNA improvement using a semi structured discussion guide held in an open and spontaneous format
- Primary Outcome Measures
Name Time Method Change in the overall mean satisfaction score of the Nutritional and Dietetic Patient Outcomes Questionnaire (NDPOQ) From baseline to 3 months of the respective study period This outcome will evaluate the patient treatment satisfaction with the counselling of the "Personal Nutrition Advisor" (PNA) -assisted remote nutritional counselling. The NDPOQ includes a 5 point likert scale of agreement (5 points=strongly agree, 1 point= strongly disagree) of 15 questions.
The overall mean score of the "perceived impact" section from the user version of the mobile application scale (uMARS ) Post intervention visit (3 months after baseline) This outcome will evaluate patient satisfaction with the counselling of the "Personal Nutrition Advisor" (PNA) -assisted remote nutritional counselling. The uMARS includes a 5 point likert scale of agreement (5 points=strongly agree, 1 point= strongly disagree) of 5 questions.
The overall mean score of the Healthcare Systems Usability Scale (HSUS) Post intervention visit (3 months after baseline) This outcome will evaluate dietitian reported usability of the "Personal Nutrition Advisor" (PNA)- assisted remote nutritional counselling. HSUS includes a 5 point likert scale of agreement (5 points=strongly agree, 1 point= strongly disagree) of 20 questions.
- Secondary Outcome Measures
Name Time Method Change in relative carbohydrate content (%) From the first day of the respective study period to 3 months thereafter This outcome will evaluate the impact of PNA-assisted remote nutritional counselling on PNA derived nutrient distribution, calculated by the energy balance model embedded in the PNA using manual entries of weight logs, meal logs and activity logs.
Proportion of patients reaching >5% weight loss At start of the GLP-1 based pharmacotherapy to 3 months of the respective study period This outcome will evaluate the potential to support weight loss by PNA-assisted remote nutritional counselling (calculated from the initial weight, measured in-clinic at start of the GLP-1 based pharmacotherapy)
Change in energy expenditure (kcal/day) From the first day of the respective study period to 3 months thereafter This outcome will evaluate the impact of PNA-assisted remote nutritional counselling on PNA derived dietary expenditure, calculated by the energy balance model embedded in the PNA using manual entries of weight logs, meal logs and activity logs.
Proportion of patients reaching >15% weight loss At start of the GLP-1 based pharmacotherapy to 3 months of the respective study period This outcome will evaluate the potential to support weight loss by PNA-assisted remote nutritional counselling (calculated from the initial weight, measured in-clinic at start of the GLP-1 based pharmacotherapy)
Change in daily number of logged meals and beverages From the first day of the respective study period to 3 months thereafter This outcome will evaluate the impact of PNA-assisted remote nutritional counselling on frequency of dietary self-monitoring (manual entries of pictures, text tags and food/beverage tags per day)
Change in relative fiber content (%) From the first day of the respective study period to 3 months thereafter This outcome will evaluate the impact of PNA-assisted remote nutritional counselling on PNA derived nutrient distribution, calculated by the energy balance model embedded in the PNA using manual entries of weight logs, meal logs and activity logs.
Change in self-reported exercise engagement per week (hours/week) At baseline and at 3 months of study intervention This outcome will evaluate the impact of PNA-assisted remote nutritional counselling on self-reported physical activity using manual entries of activity logs.
Change in the overall mean score of the General Self-efficacy Scale (GSE) from Imperial College London From baseline to 3 months of the respective study period This outcome will evaluate the impact of PNA-assisted remote nutritional counselling on self-efficacy. GSE includes a 5 point Likert scale of confidence (Not at all confident =1 point, Extremely confident=5 points) of 6 questions.
Collection of open ended PNA specific feedback questionnaires Post intervention visit (3 months after baseline) This qualitative outcome will collect opinions from patients and dietitians regarding the components of the PNA with the aim to further optimise its perceived usefulness.
Change in self reported weight (%) From baseline to 3 months of the respective study period This outcome will evaluate the potential to support weight loss by PNA-assisted remote nutritional counselling (self-reported weight closest to start and end of the study period).
Change in energy intake (kcal/day) From the first day of the respective study period to 3 months thereafter This outcome will evaluate the impact of PNA-assisted remote nutritional counselling on PNA derived dietary intake, calculated by the energy balance model embedded in the PNA using manual entries of weight logs, meal logs and activity logs.
Change in relative protein content (%) From the first day of the respective study period to 3 months thereafter This outcome will evaluate the impact of PNA-assisted remote nutritional counselling on PNA derived nutrient distribution, calculated by the energy balance model embedded in the PNA using manual entries of weight logs, meal logs and activity logs.
Change in relative fat content (%) From the first day of the respective study period to 3 months thereafter This outcome will evaluate the impact of PNA-assisted remote nutritional counselling on PNA derived nutrient distribution, calculated by the energy balance model embedded in the PNA using manual entries of weight logs, meal logs and activity logs.
Proportion of patients reaching >10% weight loss At start of the GLP-1 based pharmacotherapy to 3 months of the respective study period This outcome will evaluate the potential to support weight loss by PNA-assisted remote nutritional counselling (calculated from the initial weight, measured in-clinic at start of the GLP-1 based pharmacotherapy)
Qualitative collection of patient reported PNA specific feedback. Post intervention visit (3 months after baseline) This qualitative outcome will be assessed by an semi structured remote patient group interview addressing the patient's perspective on the utility of the dietitians' advice, discrepancy from expectations, general feedback and suggestions for PNA improvement.
Trial Locations
- Locations (1)
Department of Diabetes, Endocrinology, Clinical Nutrition and Metabolism, Inselspital, Bern University Hospital
🇨🇭Bern, Switzerland