Time Restricted Eating As Treatment (TREAT) for Diabetes Mellitus: A Pre-Post 12 Week Study on the Effectiveness of Intermittent Fasting in Asians With Type 2 Diabetes Mellitus (TREAT)

September 3, 2023 updated by: Singapore General Hospital

Type 2 Diabetes Mellitus (DM) is a silent epidemic that affects 11.3% of Singaporeans. It has numerous clinical sequelae including macrovascular and microvascular disease. Nutritional therapy has been widely accepted as being safe and affordable as compared to pharmacotherapy. It is estimated that current nutritional therapy is able to reduce HbA1c levels by 1 to 2 percent under ideal circumstances. A weight loss of >5% is needed to have any significant beneficial effects on the levels of HbA1c, lipids, and blood pressure. This requires extensive modification of lifestyle, calorie restriction, regular exercise, and close supervision by health care professionals; impracticable for most patients. Intermittent Fasting that has been shown to be effective in improving the metabolic state of human subjects. The investigators ask if a simpler dietary regime based on time restricted eating would produce the necessary weight loss and good metabolic outcome.

In this pilot single arm pre-post study, 50 adult diabetic patients will be educated on Time Restricted Eating As Treatment (TREAT). Under this intervention, subjects will skip one meal a day and aim for a fasting period 16 hours a day. In the 8 hours where eating is permitted, subjects are encouraged to eat normally based on what is recommended for diabetic patients in usual care. Relevant clinical parameters, such as blood glucose control, lipid and triglyceride levels and anthropometry will be monitored over a 12-week period.

This study would have major clinical impact if it is found that TREAT can result in the improvement of cardiometabolic parameters and is practicable and sustainable in a real world setting.

Study Overview

Status

Active, not recruiting

Conditions

Intervention / Treatment

Detailed Description

Nutritional therapy for diabetes mellitus is widely accepted as safe and affordable when compared to pharmacotherapy. However, the efficacy of the present state of nutritional therapy based on current recommendations is poor. It is estimated that nutritional therapy is able to reduce HbA1c levels by 1 to 2 percent under ideal circumstances. A weight loss of >5% is needed to have any significant beneficial effects on the levels of HbA1c, lipids, and blood pressure. This would require extensive modification of lifestyle, including calorie restriction, regular exercise, and close supervision by health care professionals. For the majority of patients, adherence to such a regime on a long-term basis is not achievable or practical.Considerable effort is required to educate and reinforce the complex behavioural changes needed. A simpler dietary regime that would produce the necessary weight loss and good metabolic outcome is needed.

Rationale for use of Intermittent Fasting as Nutritional Therapy: Practicability, Efficacy and Safety.

Intermittent fasting (IF) has been practiced by humans since ancient times, out of necessity and for religious purposes. Numerous regimens of intermittent fasting exist:

  1. Alternate-day fasting, with either a total fast or restriction of energy 60-70% below estimated requirements on alternate days.
  2. Modified Fasting Regimens (such as the 5:2 diet which involves severe energy restriction for 2 non-consecutive days in a week and ad libitum eating for the other 5 days), a variant of alternate-day fasting.
  3. Time-restricted Feeding where intake is restricted to a pre-defined time window daily, and fasting occurs for 12-21 hours of the day.

There is experimental and evolutionary evidence across microbes and animals that such fasting improves cardiometabolic health and survival. In mice, the preservation of beta cell function occurs through the mechanism of autophagy during fasting, and survival is prolonged in bacteria, yeasts, worms and mice when fasting that has been attributed to an alternative ketone-body like energy source during periods of caloric deprivation. The mechanisms of action proposed are that fasting triggers adaptive cellular stress responses, resulting in an enhanced ability to cope with more severe stress and counteract disease processes. In addition, by protecting cells from DNA damage, suppressing cell growth and enhancing apoptosis of damaged cells, fasting could retard and/or prevent the formation and growth of cancers.

In humans, there is increasing evidence that intermittent fasting produces improvements in various metabolic parameters that are potentially beneficial to Type 2 Diabetics, such as improvements in glycaemic control, lipid profiles and weight loss. For example, Carter reported equivalent reductions in HbA1c in individuals with Type 2 diabetes with 12 weeks of Intermittent Energy Restriction (IER) or Continuous Energy Restriction (CER) which had been achieved with greater reductions in insulin medications within the IER group. Arnason demonstrated improved glycaemic control and weight in 10 community-dwelling middle-aged Type 2 Diabetic adults over a six week period in which subjects underwent Time-restricted feeding intervention for 2 weeks.

Other than glycaemic control, intermittent fasting also benefits other cardiometabolic parameters. Body fat, LDL-Cholesterol, Triglycerides and weight circumference were reduced with improvements in glucose metabolism in obese subjects in response to an alternate day modified fast. Glucose metabolism, reflected by decrease in fasting insulin, improved in non-obese subjects when subjected to 3 weeks of alternate day fasting.

Alternate day fasting has been associated with hunger, distraction with lower perceived work performance and lower mood reported across some of its' human studies.Modified Fasting Regimens, though they largely result in clinically and statistically significant weight loss of between 3.2-8.0% have up to 15% of participants reporting negative side effects, such as feeling cold, irritable, low energy levels or hunger.

Time-restricted Feeding (TRF), typically have daily fasting intervals of 12-21 hours per day. There were no mean changes in tension, depression, anger, vigor, fatigue or confusion when subjects of a crossover trial were consuming one meal a day as opposed to an isocaloric diet consumed as three meals a day. There is observational evidence from Ramadan studies of Diabetic patients that glycaemic control and lipid parameters improve over a 4-week fasting period. Only one cross-over controlled study in healthy middle-aged adults has reported on metabolic outcomes with Time-restricted Feeding. Stote et al. found both pro-atherogenic changes (increased LDL cholesterol) and anti- atherogenic changes (increased HDL cholesterol and decreased TG) following 8 weeks of limiting food intake to one evening meal. This might have been confounded by circadian variations of baseline and post-intervention blood measurements, that were taken in the morning and evening respectively. Thus far, there are no publications on interventional studies on Time-restricted Feeding in diabetics to the investigators' knowledge. Time-restricted Feeding appears to be the most practical and easy to learn regime among all the intermittent fasting variations.

The investigators decided to adopt TRF and make it into a standardized regime that requires the subject to aim for a continuous fasting duration of 16 hours per day. The instruction can be taught to patients in a 30 minute session and opportunistic reinforcements. This mimics a real world counselling encounter between a primary care physician and patient with diabetes mellitus. The investigators call this regime Time Restricted Eating As Treatment (TREAT). This 12-week study of TREAT in adult patients with Type 2 Diabetes Mellitus aims to explore if this simplified form of intermittent fasting can result in clinically and statistically significant reductions in weight, improved glycaemic control and metabolic parameters including hyperinsulinemia, with particular emphasis on an Asian population. Accordingly, the investigators plan to recruit 50 community dwelling type 2 diabetic patients and instruct them on TREAT in a clinic setting. Patients will then be followed up with anthropometry and biochemical markers pertaining to diabetes during the study visits.

Study Type

Interventional

Enrollment (Estimated)

50

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

  • Singapore
      • Singapore, Singapore, 169608
        • Singapore General Hospital (Clinical Trials and Research Centre)

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

21 years to 80 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Subjects (male or female) ≥ 21 to 80 years of age at Visit 1.
  2. Subjects newly diagnosed with Type II diabetes mellitus (DM) who are solely on dietary control.
  3. Ability to sign written informed consent before any study-specific procedure.
  4. Subject is considered reliable and capable of adhering to protocol.
  5. Subjects with Body Mass Index (BMI)≥ 23.5kg/m2.

Exclusion Criteria:

  1. Subjects on Type II diabetes medication.

  2. Subjects with any of the following medical conditions:

    • Congestive cardiac failure.
    • Stage 4 or worse chronic kidney disease (i.e. eGFR < 30 ml/min/1.73 m2)
    • Child's B or worse liver cirrhosis.
    • Any medical condition that in the opinion of the investigator could jeopardize or compromise the subject's ability to participate in the study.
  3. Subject with previous or present history of eating disorder.
  4. Subject not able to understand the informed consent form or fasting diary instructions.
  5. Subject has participated in another study of an investigational medication or an investigational medical device within the last 30 days or is currently participating in these studies.
  6. Subject is pregnant or lactating.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Single Arm
Subjects will act as their own controls
Behavioral: Time Restricted Eating As Treatment (TREAT) for Diabetes.
Participants will skip a meal every day and maintain a water only fast for 16 hours. A fasting diary is kept to track hours of fasting. Participants will follow this new pattern of eating for 12 weeks. They will visit the doctor's office at least 3 times in the course of the study and will be followed up with anthropometry (weight, BMI and waist circumference) and biochemical markers pertaining to Diabetes during the study visits. At 24 weeks, a follow up phone call will be made to check self-reported compliance to intermittent fasting.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Change in glycaemic control of patients as measured by >= 5% reduction in glycosylated haemoglobin (HbA1C) over a 12 week period.
Time Frame: 12 weeks
12 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in glycaemic control of patients as measured by fasting glucose and 2 hour post prandial glucose over a 12 week period.
Time Frame: 12 weeks
Fasting glucose would reduce significantly e.g. 0.5 mmol/L over a 12 week period. Post prandial glucose would decrease significantly e.g. 0.5 mmol/L over a 12 week period.
12 weeks
Change in Blood Pressure (BP) over a 12 week period.
Time Frame: 12 weeks
Blood pressure would decrease significantly e.g. a systolic blood pressure drop of 7 mm Hg.
12 weeks
Change in Weight over a 12 week period.
Time Frame: 12 weeks
Weight would reduce significantly e.g. 5% of initial body weight in kilograms.
12 weeks
Change in Body Mass Index (BMI) over a 12 week period.
Time Frame: 12 weeks
Body Mass Index would decrease significantly e.g. 1 kg/m^2.
12 weeks
Change in Waist Circumference (WC) over a 12 week period.
Time Frame: 12 weeks
Waist circumference would decrease significantly e.g. 3 centimeters.
12 weeks
Change in the lipid profiles of patients, namely Total Cholesterol (TC), High Density Lipoprotein (HDL), Low Density Lipoprotein (LDL), Triglycerides (TG), over a 12 week period.
Time Frame: 12 weeks
Low density Lipoprotein would decrease significantly e.g. 0.5 mmol/L. Triglyceride experience a significant reduction e.g. 0.5 mmol/L.
12 weeks
Change in a levels of ketonemia (Serum Beta-Hydroxybutyrate 0.5-3.0 mmol/L) over a 12 week period.
Time Frame: 12 weeks
Presence or absence of ketonemia evidenced by Serum Beta-Hydroxybutyrate 0.5-3.0 mmol/L over a 12 week period.
12 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Singapore General Hospital

Collaborators

Duke-NUS Graduate Medical School

Investigators

  • Principal Investigator: Lee Kheng Hock, Singapore General Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 14, 2019

Primary Completion (Actual)

August 31, 2023

Study Completion (Estimated)

December 30, 2023

Study Registration Dates

First Submitted

April 16, 2019

First Submitted That Met QC Criteria

May 6, 2019

First Posted (Actual)

May 7, 2019

Study Record Updates

Last Update Posted (Actual)

September 7, 2023

Last Update Submitted That Met QC Criteria

September 3, 2023

Last Verified

September 1, 2023

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • TREAT-DM-01

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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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