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NCT Number: NCT04725630

Healthy Food Prescription Incentive Program

It is important for individuals with type 2 diabetes (T2DM) to adhere to a healthy dietary pattern to maintain optimal blood glucose levels and overall health. The increasing costs of healthy foods, however, is a barrier to maintaining healthful dietary patterns, particularly for individuals with T2DM who are experiencing food insecurity (i.e., inadequate or insecure access to food due to financial constraints). Lower diet quality may result in difficulties maintaining optimal blood glucose levels, leading to higher rates of diabetes complications, and increased acute care usage and costs.

Effective strategies to address this issue are lacking despite the well-known impact of food insecurity on maintaining optimal blood glucose levels. One way to address this problem is to provide incentives to purchase healthy foods through healthy food prescription programs. These programs may help to reduce food insecurity and improve diet quality, thereby improving blood glucose control and reducing diabetes complications over time.

This study will investigate the reach, effectiveness, adoption, implementation, and maintenance (RE-AIM) of a healthy food prescription incentive program among adults who are experiencing food insecurity and persistent hyperglycemia through three concurrent studies; a randomized controlled trial, an implementation study, and a modelling study.

The randomized controlled trial will examine the effectiveness of a healthy food prescription incentive program compared to a healthy food prescription alone in reducing blood glucose levels among adults who are experiencing food insecurity and persistent hyperglycemia.

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Key information

Conditions

Diet, Healthy Diabetes Complications Diabetes Mellitus Diabetes Mellitus, Type 2 Endocrine System Diseases Glucose Metabolism Disorders Metabolic Diseases Nutritional and Metabolic Diseases

Age range

18 year–85 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Primary Care Clinics

Various Cities, Alberta, Canada

About this study

It is vital for individuals with type 2 diabetes (T2DM) to adhere to a healthy dietary pattern to maintain optimal blood glucose levels and overall health. However, the increasing costs of healthy foods is a barrier to maintaining healthful dietary patterns, particularly for individuals with T2DM who are experiencing food insecurity (i.e., inadequate or insecure access to food due to financial constraints). Lower diet quality may result in difficulties maintaining optimal blood glucose levels, leading to higher rates of diabetes complications, and increased acute care usage and costs.

Although the adverse impact of food insecurity on maintaining optimal blood glucose levels is well documented, effective strategies to address food insecurity among individuals with T2DM are lacking. One approach to address this problem is to provide incentives for individuals to purchase healthy foods through healthy food prescription programs. These programs may help to reduce food insecurity and improve diet quality, thereby improving blood glucose levels and reducing diabetes complications over time.

Using a type 2 hybrid effectiveness-implementation design, we will conduct three concurrent studies (i.e. randomized controlled trial, implementation study, modelling study) to examine the reach, effectiveness, adoption, implementation, and maintenance (RE-AIM) of a healthy food prescription incentive program among adults who are experiencing food insecurity and persistent hyperglycemia. The randomized controlled trial will examine the effectiveness of a healthy food prescription incentive program compared to a healthy food prescription alone in improving blood glucose levels, quantified via hemoglobin A1C, among adults who are experiencing food insecurity and persistent hyperglycemia. Secondary outcomes include blood glucose levels quantified via fructosamine, the proportion of patients with elevated hemoglobin A1C (i.e. ≥ 8.5%), diet quality and skin carotenoid levels, intermediate clinical outcomes (blood lipids, blood pressure, BMI, waist circumference, need for anti-hyperglycemic medication/insulin) and patient-reported outcomes (psychosocial well-being, self-rated health, diabetes self-efficacy, diabetes self-management, diabetes distress, diabetes competing demands, perceived financial barriers to chronic disease care, hypoglycemic episodes, household food insecurity).

Methods: 594 adults who are experiencing food insecurity and persistent hyperglycemia (i.e., hemoglobin A1C 6.5-12%) from urban and rural primary care clinics will be randomized to a 12 month healthy food prescription incentive (n=297) or a healthy food prescription comparison group (n=297).

The healthy food prescription incentive program consists of the following two core elements: 1) The one-time healthy food prescription pamphlet is a low literacy resource comprised of a pre-printed healthy food prescription that outlines an evidence-based healthy dietary pattern; 2) The healthy food incentive provides a weekly incentive of $10.50/household member to purchase healthy foods in participating supermarkets for 12 months. The intervention will be delivered over 12 months to allow sufficient time for dietary changes to be reflected in several A1c cycles.

At baseline (0 months) and follow-up (12 months), participants will access a pilot-tested web-based platform to provide responses to sociodemographic and health-related items, and a variety of patient-reported outcomes, including household food insecurity. To assess diet quality, dietary intake will be assessed via two 24-hour dietary recalls at each time point using the Automated Self-Administered Dietary Assessment Tool for Canada (ASA24-Canada-2018). Clinical measurements (biochemical and physical measurements) will be obtained to assess blood glucose, blood lipids, BMI, blood pressure, skin carotenoids, and waist circumference. Need for anti-hyperglycemic medication/insulin will be quantified via administrative health records. At 6 months and 18 months participants will have their blood glucose levels measured. They will also report their dietary intake via two 24-hour dietary recalls and their household food insecurity status.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Adults (18-85 years) with type 2 diabetes (or diabetes of unknown etiology)
  • Persistent hyperglycemia (i.e. hemoglobin A1C 6.5-12%)
  • Are currently experiencing food insecurity and/or report that it is difficult/very difficult to make ends meet
  • Can communicate in English or have someone to translate

Exclusion criteria

  • A1c <6.5% or > 12% given the recommendation for anti-hyperglycemic treatment escalation for those with A1c>12%
  • Reside in a facility that provides meals (e.g., shelter, long-term care, prison)
  • Exhibit signs/symptoms of metabolic decompensation (weight loss, polyuria, polydipsia)
  • Diagnosis of eating disorder(s) (e.g., anorexia nervosa, bulimia)
  • Have experienced diabetic ketoacidosis or a hyperglycemic hyperosmolar emergency in the past year
  • Experienced a hypoglycemic event in the past 3 months
  • Are trying to conceive, pregnant and/or breastfeeding
  • Are currently participating in other clinical trials
  • A household member is currently or has previously participated in this trial
  • Unwilling/unable to shop in study-affiliated supermarkets for the next 12 months
  • Plan to leave for Canada for more than 2 weeks in the next 12 months
  • Unable to complete data collection at follow-up (e.g., due to moving)

Treatment and study plan

Healthy food incentive

Behavioral

$10.50/week/household member for 12 months to purchase healthy foods in participating supermarkets.

Healthy food prescription

Behavioral

A one-time healthy food prescription pamphlet

Primary outcomes

  1. Blood glucose levels via hemoglobin A1C

    Time frame: Assessed at Baseline (0 months) and Follow-up (6 months, 12 months, 18 months)

    Difference between intervention and comparison groups in blood glucose levels measured by hemoglobin A1C

Secondary outcomes

  1. Blood glucose levels via elevated hemoglobin A1C

    Time frame: Assessed at Baseline (0 months) and Follow-up (6 months, 12 months, 18 months)

    Difference between intervention and comparison groups in proportion of patients with elevated hemoglobin A1C (>/=8.5%)

  2. Blood glucose levels via fructosamine

    Time frame: Assessed at Baseline (0 months) and Follow-up (6 months, 12 months, 18 months)

    Difference between intervention and comparison groups in blood glucose levels via fructosamine

  3. Overall diet quality by Healthy Eating Index-2015 and by Healthy Eating Food Index-2019

    Time frame: Assessed twice at Baseline (0 months) and twice at Follow-up (6 months, 12 months, 18 months)

    Difference between intervention and comparison groups in mean diet quality by Healthy Eating Index-2015 scores and by Healthy Eating Food Index-2019 scores

  4. Diet quality sub-scores by Healthy Eating Index-2015 and by Healthy Eating Food Index-2019

    Time frame: Assessed twice at Baseline (0 months) and twice at Follow-up (6 months, 12 months, 18 months)

    Difference between intervention and comparison groups in diet quality component scores by Healthy Eating Index-2015 and by Healthy Eating Food Index-2019

  5. Fruit and vegetable intake via skin carotenoids

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in skin carotenoids

  6. Blood Lipids

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in blood lipids including total-, HDL- and LDL-cholesterol, triglycerides, apolipoprotein B

  7. Blood Pressure

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in both systolic and diastolic blood pressure

  8. Body Mass Index

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in Body Mass Index

  9. Waist Circumference

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in waist circumference

  10. Anti-hyperglycemic Medication/Insulin

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in need for anti-hyperglycemic medication and/or insulin.

  11. World Health Organization-5 Well-Being Scale scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in World Health Organization Well-Being Scale scores. The World Health Organization Well-Being scale will be used to assess experiences of well-being in the last 2 weeks with scores ranging from 0 (worst possible quality of life) to 25 (best imaginable quality of life).

  12. Stanford Diabetes Self-efficacy Scale scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in Stanford Diabetes Self-efficacy Scale scores. The Stanford Diabetes Self-efficacy Scale will be used to assess confidence in completing activities related to diabetes. Scores range from 8 (not confident at all) to 80 (totally confident).

  13. Diabetes Self-Management Questionnaire scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in ability to self manage diabetes- related activities. The Diabetes Self-Management Questionnaire will be used to assess effective self-care behaviour, with a score of 0 indicating least effective self-care behaviour and 10 indicating most effective self-care.

  14. Problem Areas in Diabetes Scale scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in Diabetes Scale scores. The Problem Areas in Diabetes Scale will assess emotional distress related to diabetes. Scores can range from 0-100, with scores above 40 indicating higher levels of emotional burnout and scores below 10 indicating denial when combined with poor glycemic control.

  15. EQ-5D-5L scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in self-reported overall health. The EQ-5D-5L is a 5-item tool that will be used to assess health factors such as mobility, self care, usual activities, pain, anxiety. Level 1 scores indicate "no problems", levels 2-4 scores indicate more frequent problems, level 5 indicates extreme impairments.

  16. Hypoglycemic Episodes

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in frequency of hypoglycemic episodes. Frequency of hypoglycemic episodes is measured using a single question ("In the past year, how many times have you had a severe low blood sugar reaction, such as passing out or needing help to treat the reaction?"). Categorical responses include 0, 1-3, 4-6, 7-11, 12 or more. Severe hypoglycemia is indicated at 4 or more times.

  17. Barriers to Care for People with Chronic Health Conditions scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in barriers to care. The Barriers to Care for People with Chronic Health Conditions - Economic Barriers to Care scale and Insurance scale will assess economic related barriers in accessing care, which includes services, equipment, and/or medication. Responses of "always", "often", or "sometimes" indicate economic barriers are present.

  18. Health Canada's Household Food Security Survey Module scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (6 months, 12 months, 18 months)

    Difference between intervention and comparison groups in experiences of household food insecurity. Health Canada's 18-item Household Food Security Survey Module will be used to assess experiences of marginal (1 affirmative response), moderate (2-5 affirmative responses) and severe (≥ 6 affirmative responses) household food insecurity in the past 6 months.

  19. Diabetes Competing Demands scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in Diabetes Competing Demands scores. The Diabetes Competing Demands 2-item scale will be used to assess the frequency of trade-offs between food, medicine, and diabetes supplies. A response of "often" or "sometimes" to either question indicates trade-offs have occurred.

  20. Dose-response analyses

    Time frame: 0-12 months

    Dose-response analysis will examine whether outcomes depended on the value of healthy food incentives earned and/or redeemed

Other outcomes

  1. MacArthur Scale of Subjective Social Status scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in subjective social status. The MacArthur Scale of Subjective Social Status national and community ladders consist of a self-reported visual analog scale, whereby respondents place themselves on a ladder rung according to their perceived social standing relative to others in their nation or community. Responses can take a value from 1-10, with a higher score indicating higher subjective social status in relation to others' within ones' nation or community.

  2. Work Productivity and Activity Impairment scores

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in Work Productivity and Activity Impairment scores. The Work Productivity and Activity Impairment 6-item scale will be used to assess impairments in paid and unpaid work due to health issue(s) in the last 7 days. Four scores are calculated including absenteeism (work time missed), presenteeism (impairment at work/reduced on-the-job effectiveness), work productivity loss (overall work impairment/absenteeism + presenteeism), and activity impairment. Higher scores in each category indicate greater impairment and less productivity.

  3. Perceived Income Adequacy

    Time frame: Assessed at Baseline (0 months) and Follow-up (6 months, 12 months, 18 months)

    Difference between intervention and comparison groups in perceived income adequacy, which is measured using a single question ("To what extent do you think your income is enough for you to live on?"). Using a 5-point response scale, scores are calculated for each participant to indicate either adequate or inadequate income.

  4. Medication Adherence

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in medication adherence. The Simple 1-item Visual Analog Scale consists of a continuum along which participants indicate how often they have taken their prescribed medication in the last 7 days. Responses range from 0% (none at all), 50% (half of prescribed doses), and 100% (all doses of prescribed medications) with higher values indicating greater medication adherence.

  5. Physical Activity Adherence

    Time frame: Assessed at Baseline (0 months) and Follow-up (12 months)

    Difference between intervention and comparison groups in physical activity adherence. Patients will report on how many days during the past week they did a total of 30 minutes or more of physical activity that was enough to raise their heart rate.

  6. Subgroup analyses

    Time frame: Assessed at Baseline (0 months) and Follow-up (6 months, 12 months, 18 months)

    We will conduct subgroup analyses by gender, severity of food insecurity, rural residence, Indigenous status, baseline A1C (6.5-8.5%, 8.6-12%) and insulin use.

  7. Proportion of energy from ultra-processed foods

    Time frame: Assessed twice at Baseline (0 months) and twice at Follow-up (6 months, 12 months, 18 months)

    Difference between intervention and comparison groups in mean proportion of energy from ultra-processed foods

Sponsors and collaborators

Lead sponsor

University of Calgary

Other

Collaborators

  • Alberta Blue Cross
  • Alberta Health services
  • Alberta Innovates Health Solutions
  • Canadian Institutes of Health Research (CIHR)
  • Nu Skin Enterprises

Registry information

Official study title

A Healthy Food Prescription Incentive Program for Adults With Type 2 Diabetes Who Are Experiencing Food Insecurity

Important dates

Study start
2021
Primary completion
2024
Study completion
2025
First posted
Jan 27, 2021
Registry last updated
Jun 26, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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