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CompletedNCT00516620Updated Dec 9, 2015

Fruits, Vegetables, and Whole Grains: A Community-based Intervention

A Phase 1 interventional study of No further instruction and Food Delivery in Heart Disease, Diabetes and Hypertension, sponsored by University of Toronto. Completed at 1 site in Canada. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2015-12-09.

Sponsored by University of Toronto · Phase 1, Interventional, and Treatment

Phase
Phase 1
Study type
Interventional
Enrollment
960
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

The aim of this study is to see if the investigators can encourage people to eat more fruits, vegetables and whole grains and drink less pop by giving them advice about their diet, or by providing them with samples of different kinds of foods. The investigators are interested in the effect this has on reducing the risk of chronic disease. The investigators will also be investigating how certain genes affect the choices people make about the foods they eat.

Read the detailed description

Governments and major national agencies throughout the western world concerned with chronic disease prevention (heart disease, stroke, diabetes, and cancer) uniformly advocate increased intakes of fruit, vegetables and whole grain cereals. All also agree that body weight reduction is central to reducing the risk of heart disease, stroke, type 2 diabetes, and certain cancers. Nevertheless, there is no official advice encouraging increased consumption of these foods in order to achieve and maintain a healthy body weight. Most importantly, there are no intervention studies that have tested the assumption that increased intake of fruit, vegetables and whole grain cereals will promote a healthier body weight. Our study will therefore address this issue to determine the effect of an increased intake of fruit, vegetables, and whole grain cereals on body weight, the intensity of effort required to achieve compliance, the durability of this habit, genetic determinants, and the effect on biomarkers of chronic disease risk.

We will ask approximately 780 families to take part in this study. We will invite households to take part if there is at least one adult who is eligible for our study, and who agrees to participate.

To be eligible for this study, participants must be at least 18 years old and have no medical conditions that would make it unsafe for them to take part. Before beginning the study, the medical history and other measures will be checked to ensure participant safety and suitability for participating in the study.

This study consists of three parts. If agreement to participate is given, the first part is to make an appointment to come to our study clinic to give a fasting blood sample (baseline measurements), about 40mL of blood. The clinic visit will last approximately 40 minutes. All participants will be asked to complete a short checklist about their medical history, which includes information to make sure that they and their household are eligible for participation. Body fat measurements will also be made using a non-invasive, very simple machine called Futrex as well as height, weight, waist-to-hip ratio, and blood pressure. Part of the blood sample will be used for a health screen to ensure subject safety and suitability for participating in the study. Blood samples will be stored in a secured location and analyzed at the end of the study for cholesterol levels and other risk factors for heart disease. Part of the blood sample will be used in DNA analysis to help us understand the genes related to food intake and metabolism. We will also ask all participants to complete a questionnaire package about their eating habits and their physical activity either prior to the clinic visit or at the end of the clinic visit. Once the questionnaires are completed and returned to the study office, the second part of the study will commence.

The second part is the intervention itself, lasting six months. If households are deemed to be eligible, they will be 'randomized' into one of eight study groups with all groups receiving Canada's Food Guide \& Physical Activity Guide. The study groups involve a combination of different kinds of dietary advice and provision of fruit, vegetables, and whole grain cereals.

  • Treatment 1: no food provision or dietary advice.
  • Treatment 2: food delivery.
  • Treatment 3: counseling on fruit, vegetables and whole grains.
  • Treatment 4: counseling to reduce soft drink intake.
  • Treatment 5: food delivery AND counseling on fruit, vegetables and whole grains.
  • Treatment 6: food delivery AND counseling to reduce soft drink intake.
  • Treatment 7: counseling on fruit, vegetables, whole grains AND counseling on the reduction of soft drink intake.
  • Treatment 8: food delivery AND counseling on fruit, vegetables, whole grains AND counseling on the reduction of soft drink intake.

All food boxes are prepared and delivered by Food Share, a Toronto-based non-profit organization that has an existing system for home delivery of nutritious food boxes. If participants do receive dietary counseling, it will involve a phone call once a week for the first month (for about 20 minutes) then a phone call once a month for the next 5 months. At the end of six months, participants will be asked to fill in provided questionnaires and return to the clinic to repeat the procedures.

The third part is a follow-up 12 months after the end of the intervention. Again, participants will be asked to fill in provided questionnaires and return to the clinic to repeat the procedures.

02

Conditions studied

  • Heart Disease
  • Diabetes
  • Hypertension

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Keywords

  • Body Weight
03

In context

Heart Diseases

3,640 studies on the registry are indexed under Heart Diseases; 461 are open to participants now.

This study's enrollment of 960 is above the median of 100 across 1,779 interventional studies indexed under Heart Diseases.

Browse Heart Diseases studies →

Lead sponsor

University of Toronto is the lead sponsor of 397 studies on the registry; 59 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • residents of households within the City of Toronto 416 calling area
  • respond to advertisements in newspaper, on radio, and from flyers
  • Eligible households will include at least one willing adult 18 years or older; able to communicate in English, at least one adult with BMI >/= 25
  • Pregnant and breastfeeding mothers who fit the criteria above are eligible to join the study 6 months post-partum or 6 months after the cessation of breastfeeding
  • Individuals who fit the inclusion criteria but recently (past 6 months) started blood pressure medication are eligible for the study once their blood pressure is under control
  • Individuals who fit the inclusion criteria but recently started hypothyroid medication or diuretics will be eligible after 1 month of treatment

Exclusion criteria

Exclusion Criteria:

  • Residing outside of the 416 area code
  • under 18 years of age
  • actively following a special diet or weight-loss program
  • major cardiovascular event in the previous 6 months
  • recently (past 6 months) started blood pressure medication
  • diabetes, liver disease, renal failure, cancer (or a history of malignancy), inflammatory bowel disease, individuals with acute or chronic infections, either bacterial or viral, or individuals suffering from chronic inflammatory diseases, irritable bowel syndrome, peanut or nut allergy, major surgery in the previous 6 months
  • blood pressure greater than 145/95 on repeated measurements will be excluded
05

Study design

Phase
Phase 1
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Factorial assignment
Masking
None (open label)
Enrollment
960 participants (actual)

Study arms

  • Active comparator
    1

    Participants receive Health Canada's Food Guide and Physical Activity guide.

    Behavioral: No further instruction · Behavioral: Food Delivery · Behavioral: Fruits (F), vegetables (V), and whole grain (WG) counseling · Behavioral: Counseling to reduce soft drink intake. · Behavioral: Food Delivery & F, V & WG counseling. · Behavioral: Food delivery & soft drink counseling · Behavioral: F, V, WG & soft drink counseling · Behavioral: Food delivery and F,V, WG & soft drink counseling

  • Active comparator
    2

    Participants receive a weekly sample food basket for 6 months consisting of fruits, vegetables, whole grains, and vegetable protein products.

    Behavioral: Food Delivery · Behavioral: Food Delivery & F, V & WG counseling. · Behavioral: Food delivery & soft drink counseling · Behavioral: Food delivery and F,V, WG & soft drink counseling

  • Active comparator
    3

    Participants receive intensive dietary counseling for 6 months to increase intake of fruits, vegetables, whole grains, and vegetable protein products.

    Behavioral: Fruits (F), vegetables (V), and whole grain (WG) counseling · Behavioral: Food Delivery & F, V & WG counseling. · Behavioral: F, V, WG & soft drink counseling · Behavioral: Food delivery and F,V, WG & soft drink counseling

  • Active comparator
    4

    Participants receive intensive dietary counseling for 6 months to decrease intake of sweetened soft drink.

    Behavioral: Counseling to reduce soft drink intake. · Behavioral: Food delivery & soft drink counseling · Behavioral: F, V, WG & soft drink counseling · Behavioral: Food delivery and F,V, WG & soft drink counseling

Interventions

  • BehavioralNo further instruction

    Participants receive Health Canada's Food Guide and Physical Activity Guide and no other intervention for the 6 months of the intervention period.

    Also known as: Control

  • BehavioralFood Delivery

    Participants receive Canada's Food Guide and Physical Activity guide, in addition to a a weekly sample food basket for 6 months consisting of fruits, vegetables, whole grains, and vegetable protein products.

  • BehavioralFruits (F), vegetables (V), and whole grain (WG) counseling

    Participants receive Canada's Food Guide and Physical Activity guide, and intensive dietary counseling for 6 months to increase intake of fruits, vegetables, whole grains, and vegetable protein products. The counselling frequency will be weekly intervals for the first month, and then monthly sessions for the second to sixth months.

    Also known as: Fruit, Vegetable and Whole Grain Counseling

  • BehavioralCounseling to reduce soft drink intake.

    Participants receive Health Canada's Food Guide and Physical Activity guide, and intensive dietary counseling for 6 months to decrease intake of sweetened soft drink. The counselling frequency will be weekly intervals for the first month, and then monthly sessions for the second to sixth months.

    Also known as: Sweetened Soft Drink Counseling

  • BehavioralFood Delivery & F, V & WG counseling.

    Participants receive Health Canada's Food Guide and Physical Activity guide, a weekly sample food basket for 6 months consisting of fruits, vegetables, whole grains, and vegetable protein products, and intensive dietary counseling to increase intake of fruits, vegetables, whole grains, and vegetable protein products. The counselling frequency will be weekly intervals for the first month, and then monthly sessions for the second to sixth months.

    Also known as: Food Delivery, Fruit, Vegetable and Whole Grain Counseling

  • BehavioralFood delivery & soft drink counseling

    Participants receive Health Canada's Food Guide and Physical Activity guide, a weekly sample food basket for 6 months consisting of fruits, vegetables, whole grains, and vegetable protein products, and intensive dietary counseling for 6 months to decrease intake of sweetened soft drink. The counselling frequency will be weekly intervals for the first month, and then monthly sessions for the second to sixth months.

    Also known as: Food Delivery, and Sweetened Soft Drink Counseling

  • BehavioralF, V, WG & soft drink counseling

    Participants receive Health Canada's Food Guide and Physical Activity guide, and intensive dietary counseling for 6 months to increase intake of fruits, vegetables, whole grains, and vegetable protein products, and also to decrease intake of sweetened soft drink. The counseling frequency will be weekly intervals for the first month, and then monthly sessions for the second to sixth months.

    Also known as: Fruit, Vegetable, Whole Grain, Sweetened Soft Drink Counseling

  • BehavioralFood delivery and F,V, WG & soft drink counseling

    Participants receive Health Canada's Food Guide and Physical Activity guide, receive a weekly sample food basket for 6 months consisting of fruits, vegetables, whole grains, and vegetable protein products, and intensive dietary counseling for 6 months to increase intake of fruits, vegetables, whole grains, and vegetable protein products, and also to decrease intake of sweetened soft drink. The counselling frequency will be weekly intervals for the first month, and then monthly sessions for the second to sixth months.

    Also known as: Food Delivery, Fruit, Vegetable, Whole Grain, and Sweetened Soft Drink Counseling

06

What researchers measure

Primary outcomes

  1. Body Weight

    Time frame: 18 months

Secondary outcomes

  1. Biomarkers of diet and obesity-related chronic diseases (serum lipids, homocysteine and C-reactive protein) and genotypes

    Time frame: 18 months

07

Study locations

1 site
  • University of Toronto
    Toronto, Ontario M5S 3E2, Canada
08

References and documents

Publications

  • Wang J, Jamnik J, Garcia-Bailo B, Nielsen DE, Jenkins DJA, El-Sohemy A. ABO Genotype Does Not Modify the Association between the "Blood-Type" Diet and Biomarkers of Cardiometabolic Disease in Overweight Adults. J Nutr. 2018 Apr 1;148(4):518-525. doi: 10.1093/jn/nxx074. PubMed 29659952 ↗
  • Jenkins DJA, Boucher BA, Ashbury FD, Sloan M, Brown P, El-Sohemy A, Hanley AJ, Willett W, Paquette M, de Souza RJ, Ireland C, Kwan N, Jenkins A, Pichika SC, Kreiger N. Effect of Current Dietary Recommendations on Weight Loss and Cardiovascular Risk Factors. J Am Coll Cardiol. 2017 Mar 7;69(9):1103-1112. doi: 10.1016/j.jacc.2016.10.089. PubMed 28254171 ↗
09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Dec 9, 2015, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT00516620
Lead sponsor
University of Toronto
Collaborators
Unity Health Toronto, Cancer Care Ontario
Responsible party
David Jenkins (Professor, University of Toronto) — Principal investigator
First posted
Aug 15, 2007
Start date
Jan 2005
Primary completion
May 2011
Completion
May 2011
Last update
Dec 9, 2015

Study contacts

Daivd JA Jenkins, MD, PhD
principal investigator · University of Toronto, St. Michael's Hospital

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

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