The Impact of Glycemic Index Education on Lowering Dietary GI in Gestational Diabetes Mellitus

Not Applicable

• Conditions: Gestational Diabetes Mellitus
• Interventions: Behavioral: Low Glycemic Index Education

• Registration Number: NCT04272840
• Lead Sponsor: IWK Health Centre

Brief Summary

Gestational Diabetes Mellitus (GDM) incidence is increasing worldwide, and within Canada, the Atlantic provinces statistically have been found to have highest prevalence of diabetes. Increasing evidence supports the benefit of following a low glycaemic index (GI) diet in GDM and the Canadian Diabetes Guidelines recommends replacing high GI foods for low GI foods. Despite recommendation to adapt a low GI diet in GDM, there are limitations and barriers recognized to GI utility largely focused on knowledge translation. There is sufficient research to support a low GI diet in benefiting outcomes of GDM, therefore the GI in GDM Online trial will investigate the feasibility and effectiveness of a distance low GI education intervention, adapted from Diabetes Canada's GI materials, on producing a difference in average dietary GI between a group with the intervention and standard care.

Detailed Description

The incidence of Gestational Diabetes Mellitus (GDM) has been progressively increasing worldwide, with a global prevalence of gestational hyperglycaemia estimated at 16.9%. In Canada, Atlantic provinces have been recorded with the highest prevalence of diabetes at 6%. The Diabetes Canada Practice Guidelines recommends the low glycemic index (GI) diet to type 1 and 2 diabetes mellitus and has recently updated its guidelines to include a recommendation for GDM. This said, barriers to GI knowledge translation have been identified. This study uses a prospective parallel randomized control trial design. Procedures and materials have been adapted from NCT01589757. The Kirkpatrick Model (Reaction, Learning, Behaviour, and Results) informed intervention development and evaluation strategies. The purpose of this study is to evaluate whether a distance low GI education intervention, adapted from Diabetes Canada's GI education materials, will significantly yield a lower average GI (primary outcome) in participants than traditional standard care medical nutrition therapy for Gestational Diabetes Mellitus. We hypothesize that participants who receive the low GI intervention will have a lower dietary GI than those who received usual IWK standard care for GDM.

Study Timeline

• Study First Submitted: 2019-10-20
• Study Start: 2019-10-24
• Study First Submitted QC: 2020-02-14
• Study First Posted: 2020-02-17
• Status Verified: 2022-03
• Last Update Submitted: 2022-03-29
• Last Update Posted: 2022-03-31
• Primary Completion: 2022-05-31
• Study Completion: 2022-08-30

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: Female
• Target Recruitment: 60

Inclusion Criteria

• Of or over 18 years of age
• Diagnosed with GDM according to Diabetes Canada
• At or over than 20 weeks gestation
• At or less than 32 weeks gestation
• Being followed at IWK Health Centre
• Willing and able to give informed consent
• Willing and able to complete study protocol
• Currently living in Nova Scotia

Exclusion Criteria; women who:

• have been diagnosed with acute or chronic illness, other than GDM and PCOS, that may impact carbohydrate digestion metabolism.
• are currently taking a medication (other than insulin) that may affect carbohydrate metabolism.
• have multi-fetal pregnancy in current pregnancy.
• have insurmountable language barriers.

Exclusion Criteria

Not provided

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Low Glycemic Index	Low Glycemic Index Education	Standard care + Glycemic Index. Participants will attend a 30-45 min workshop. Trainees will review Diabetes Canada Clinical Practice Guidelines Job Aids (Just the Basics, the Handy Portion Guide, and Basic Carbohydrate Counting) and teach data provision skills (how to complete a three day diet record). Diabetes Canada and Dietitian's Canada resources on glycemic index will also be reviewed: the Glycemic Index Food Guide, Flip Cards, and Recipes.

Primary Outcome Measures

Name	Time	Method
Transfer/KM Level 3: Change in average dietary GI	From baseline to 4-6 weeks postpartum	Average dietary GI; diet record at baseline, 4-6 weeks post-intervention, 4-6 weeks postpartum

Secondary Outcome Measures

Name	Time	Method
Knowledge/KM Level 2: Learning	From baseline to 4-6 weeks postpartum	Average Quiz Score: Close-ended format, Scored by correct answers.
Maternal Height	Baseline	Medical Record, measured in cm.
Maternal Pre-Pregnancy body weight	Baseline	Medical Record, measured in kg.
Acceptability and Applicability of Education/KM Level 3: Transfer (Behaviour Change)	From 4-6 weeks post-intervention to 4-6 weeks post-partum	Mixed form Questionnaire (GIQ): Close ended format using Likert Scale and True or False choices. Open-ended questions for feedback.
Results/KM Level 4: Glycemic Control (rate of Self-monitored blood glucose levels within range)	From Baseline to 4-6 weeks post-partum	Medical Record (standard care 2-4 time-points per day)
Maternal Demographics (eg. age, ethnicity, language spoken, education level and work status)	Baseline	Mixed-form Questionnaire (GIQ) and Medical Chart
Maternal Weight, during pregnancy	From Baseline to 4-6 weeks post-partum.	Medical Record, measured in kg.
Satisfaction/ KM Level 1: Reaction	From baseline to 4-6 weeks postpartum	Mixed form Questionnaire (GIQ): Close ended format with True or False, Multiple Choice, and Likert Scale choices. Open-ended questions for feedback.

Trial Locations

Locations (1)

IWK Health Centre; 🇨🇦 Halifax, Nova Scotia, Canada