- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT06118931
Time-restricted Eating, Window Timing, Type 2 Diabetes Status and Sex on Glycemic Control
The Impact of Time-restricted Eating, Window Timing, Type 2 Diabetes Status and Sex on Glycemic Control
Study Overview
Status
Intervention / Treatment
Detailed Description
The overarching aim of this study is to evaluate the interactions between TRE window timing, type 2 diabetes status, and sex among individuals with obesity. The first objective is to compare the effects of three 9-h TRE window times (early: 7:00-16:00 h, mid: 9:30-18:30 h, delayed: 12:00-21:00 h) on real-time, free-living glycemic control. The second objective is to determine if type 2 diabetes status (type 2 diabetes versus prediabetes or moderate+ risk for type 2 diabetes aka at risk for type 2 diabetes) modifies the effect of eating window timing on glycemic control outcomes. The exploratory objectives include: 1) determine whether sex modifies TRE adherence or the effect of TRE on metabolic changes relative to control; and 2) to compare changes in dietary intake, body weight, and blood pressure within and between early, mid, and delayed TRE. We have the following hypotheses related to these objectives:
- The early TRE window will result in the most favourable glycemic control outcomes but also the lowest participant acceptability followed by mid and delayed TRE.
- There will be larger differences in glycemic control outcomes between the TRE window timings among those with type 2 diabetes compared to those at risk for type 2 diabetes.
- TRE adherence and changes in glycemic control, and weight loss with all TRE window times (relative to control) will be higher in men vs women.
- Energy, carbohydrate, and sugar intake, body weight, and blood pressure will decrease during TRE, but with no differences by window timing.
Study Type
Enrollment (Estimated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Amy A Kirkham, PhD
- Phone Number: 416-946-4069
- Email: amy.kirkham@utoronto.ca
Study Contact Backup
- Name: Rebecca AG Christensen, PhD
- Email: Rebecca.christensen@mail.utoronto.ca
Study Locations
-
-
Ontario
-
Toronto, Ontario, Canada
- Remote Ontario-wide
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Adult
- Older Adult
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- Aged >18 years
- Body mass index >30 kg/m2 and <50 kg/m2
- Have access to an Apple or Android cellphone with Bluetooth.
- Have type 2 diabetes or be at risk for type 2 diabetes (defined as high (33+) Canadian Diabetes Risk Score)
Exclusion Criteria:
- Individuals with type 2 diabetes will be excluded if: (1) currently on >3 monotherapies for diabetes, (2) have had diabetes therapy dosage changes <3 months, (3) self-reported hemoglobin A1c >9.0%, (4) taking exogenous insulin, or (5) taking sulfonylureas
The following exclusion criteria applies to all potential participants:
- History of or referral for bariatric surgery
- Weight loss >5% in the last 3 months
- Taking antiobesity (weight loss) medications
- Body weight >340lbs
- Diagnosed cognitive disorder that precludes them from giving consent
- Inability or unwillingness to change their eating window to follow those prescribed in the study
- Currently eating during <12 hour period on 5 or more days/week
- Physician-diagnosed eating disorder
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Early (7:00-16:00h) TRE
Participants will be asked to eat ad libitum between the hours of 7:00 - 16:00 each day for seven days, and then only drink water or other no calorie beverages for the rest of the day.
On the 8th day, they will consume one meal replacement beverage at 7:00 and be instructed to not consume anything else for two hours.
After the two hours they will be instructed to return to their normal baseline eating habits.
|
A standardized TRE Protocol where participants eat ad libitum between the hours of 7:00 to 16:00 for 7 days.
On the 8th day, they will consume a meal replacement beverage at 7:00, and not consume anything else for two hours.
|
Experimental: Mid (9:30-18:30h) TRE
Participants will be asked to eat ad libitum between the hours of 9:30 - 18:30 each day for seven days, and then only drink water or other no calorie beverages for the rest of the day.
On the 8th day, they will consume one meal replacement beverage at 9:30 and be instructed to not consume anything else for two hours.
After the two hours they will be instructed to return to their normal baseline eating habits.
|
A standardized TRE Protocol where participants eat ad libitum between the hours of 9:30 to 18:30 for 7 days.
On the 8th day, they will consume a meal replacement beverage at 9:30, and not consume anything else for two hours.
|
Experimental: Late (12:00-21:00h) TRE
Participants will be asked to eat ad libitum between the hours of 12:00 - 21:00 each day for seven days, and then only drink water or other no calorie beverages for the rest of the day.
On the 8th day, they will consume one meal replacement beverage at 12:00 and be instructed to not consume anything else for two hours.
After the two hours they will be instructed to return to their normal baseline eating habits.
|
A standardized TRE Protocol where participants eat ad libitum between the hours of 12:00 to 21:00 for 7 days.
On the 8th day, they will consume a meal replacement beverage at 12:00, and not consume anything else for two hours.
|
No Intervention: Control
During the first week of the study, participants will be asked to eat as they normally do, and to not make any changes regarding when they are stopping or starting eating.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Average 24-hour glucose total area under the curve (AUC) over 7 days
Time Frame: 7 days
|
Assessed for 7 continuous days using a continuous glucose monitor.
|
7 days
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Average 24-hour glucose over 7 days
Time Frame: 7 days
|
Assessed for 7 continuous days using a continuous glucose monitor.
|
7 days
|
Average daily nocturnal glucose over 7 evenings
Time Frame: 7 days
|
Assessed for 7 continuous evenings based on the sleep period identified by the Fitbit tracker using a continuous glucose monitor.
|
7 days
|
Average daily time spent in hyperglycemia over 7 days
Time Frame: 7 days
|
The average number of hours with glucose >10 mmol/L over 7 continuous days assessed with a continuous glucose monitor.
|
7 days
|
Postprandial glucose
Time Frame: 2 hours
|
Assessed on the morning after the 7th day of each TRE protocol.
Participants will consume a standardized breakfast at a specified time, and glucose will be evaluated via continuous glucose monitor from the time they start consuming the breakfast for 2 hours.
|
2 hours
|
Glycemic viability
Time Frame: 7 days
|
The average of each standard metrics of glycemic viability (standard deviation, coefficient of variation, mean amplitude of glycemic exercise, and continuous overall net glycemic action) will be calculated over 7 continuous days from continuous glucose monitors.
|
7 days
|
Patient acceptability
Time Frame: 7 days
|
Patient acceptability will be assessed based on researcher-developed questions related to their experience with each TRE protocol.
|
7 days
|
TRE fasting duration adherence
Time Frame: 7 days
|
Participants will receive twice daily text messages asking what time they started and stopped eating that day, which will be used to calculate the length of the fast each day.
Adherence will be calculated as the % of days where the participant fasted for 15h or longer.
|
7 days
|
TRE fasting window adherence
Time Frame: 7 days
|
The proportion of days where participants began and ended their meal within 15 min or 30 min of their prescribed time.
|
7 days
|
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Dietary intake
Time Frame: 7 days
|
Participants will complete the ASA-24 at baseline, and during each of the intervention periods to assess changes in macro and micronutrient composition of their diet.
|
7 days
|
Weight change
Time Frame: 7 days
|
Participants will be asked to weigh themselves first thing in the morning, with minimal and no clothing on, after they have emptied their bowels once during the baseline period and on the last day of each of the intervention period.
|
7 days
|
Blood pressure change
Time Frame: 7 days
|
Participants will be asked to measure their blood pressure once during the baseline period, and on the last day of each intervention period.
|
7 days
|
Physical Activity
Time Frame: 7 days
|
Participants will be asked to wear a Fitbit for the duration of the study.
We will average the amount of physical activity over 7 days of wear.
|
7 days
|
Sleep
Time Frame: 7 days
|
Participants will be asked to wear a Fitbit for the duration of the study.
We will average the amount of sleep over 7 days of wear.
|
7 days
|
Safety and Adverse Events
Time Frame: 7 days
|
Participants will be given access to a questionnaire to report any symptoms throughout the intervention.
We will compare the proportion of individuals who report these symptoms within each time period.
|
7 days
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Amy A. Kirkham, PhD, University of Toronto
Study record dates
Study Major Dates
Study Start (Estimated)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 44122
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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