Effect of Eating Timing on Body Composition

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT03365544
Recruitment Status : Not yet recruiting
First Posted : December 7, 2017
Last Update Posted : December 7, 2017
Information provided by (Responsible Party):
Peter Lemon, Western University, Canada

Brief Summary:

This study will examine the effect of eating timing on body composition. Previous studies have shown that restricting food intake to 8 hours a day can result in losses in body fat and an up-regulation of fat use. The purpose of this study is to assess changes in body composition when the eating window time is from 6am-2pm vs 2pm-10pm.

Hypothesis: The 2-10pm eating window will result in significantly greater changes in body composition (i.e. decreased fat mass) and the 2pm-10pm window will result in better adherence.

Methods: Body composition (fat and lean mass) will be assessed by air displacement densitometry (Bod Pod). Measures will be made over 4 weeks (pre-) and (post) dietary treatment. Adherence will also be assessed by a questionnaire to determine the ease/difficulty of the treatment.

Condition or disease Intervention/treatment Phase
Time-Restricted Eating (16:8) Fasting Other: Time-restricted eating Not Applicable

Detailed Description:

Purpose The purpose of the study is to determine whether the eating window of a time-restricted eating protocol affects changes in body composition. It is hypothesized that the afternoon group will have better adherence to their experimental protocol and have greater changes in body composition.

Sample The sample will include 20 healthy adult participants ranging in age from 18-25 that volunteer to participate in the study. Participants will be required to have a body mass index above 26 (BMI=weight(kg)/height(m)2). All individuals must give written informed consent in order to participate in the study. Exclusion criteria include a history of intermittent fasting in the past 6 months, diabetes, or pregnancy and BMI less than 25.9.

Procedure Inclusion/exclusion criteria will be explicitly stated throughout the recruitment process. Potential participants will be recruited through advertising using posters placed through the University of Westerns campus as well as via presentations in classrooms (using the information from the advertising flyers). Individuals who email Bryce Knapp will be invited to a meeting to discuss the study. After the evaluation and information meeting, the individual will be given up to 3 days to determine if they want to participate and give their informed consent. See attached form in the consent section of the ethics application.

Measurement: All individuals will have their body composition measured. Body composition will be measured using air displacement densitometry "Bod Pod". Measurements will be taken twice prior to the intervention and twice on successive days post-intervention. Individuals will also be asked to fill out a biweekly modified dialysis diet and fluid non-adherence questionnaires (DDFQ) with added checkboxes to record which days they complied with the required protocol and 2 questions regarding any struggles the participants experienced. This will be used to assess the adherence to the protocols.

Protocol: 20 participants matched for BMI will be assigned to one of two groups. The two groups will be assigned an eating period of 6am-2pm or 2pm-10pm and instructed not to ingest calories outside of their respective eating window. The interventions will last 4 weeks with individuals being asked to comply to their eating window a minimum of 5 days per week. This will be measured using the modified DDFQ. All testing will be completed by Bryce Knapp under the supervision of Dr. Lemon. The changes in fat mass will be analyzed using a 2-way ANOVA and the adherence will be measured using an independent t-test.

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 20 participants
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Intervention Model Description: One group has their eating window between 6am-2pm and the other has their eating window between 2pm-10pm.
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: The Effect of Different Time-restricted Eating Windows on Body Composition
Estimated Study Start Date : January 2018
Estimated Primary Completion Date : February 2018
Estimated Study Completion Date : March 2018

Arm Intervention/treatment
Experimental: 6am-2pm eating window
4 weeks of time restricted eating between 6am-2pm.
Other: Time-restricted eating
Groups will be required to only ingest calories in their designated 8 hour eating window.
Other Name: Intermittent Fasting

Experimental: 2pm-10pm eating window
4 weeks of time restricted eating between 2pm-10pm.
Other: Time-restricted eating
Groups will be required to only ingest calories in their designated 8 hour eating window.
Other Name: Intermittent Fasting

Primary Outcome Measures :
  1. Change in Fat mass using "Bod Pod" [ Time Frame: 4 weeks ]
    Measuring the change in fat mass between the two groups using air displacement densitometry "Bod Pod"

Secondary Outcome Measures :
  1. Adherence using the dialysis diet and fluid non-adherence questionnaire. [ Time Frame: 4 weeks ]
    Measuring adherence of the two groups using the DDFQ non adherence questionaire

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 25 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • 18-25 years of age
  • men and women

Exclusion Criteria:

  • Body mass index less than 26
  • No history of intermittent fasting in the past 6 months
  • No participants with diabetes
  • Are pregnant or become pregnant (self-reported)
  • Have symptoms or take medication for a respiratory, cardiovascular, neuromuscular, or metabolic disease

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03365544

Contact: Peter Lemon, PhD 519-661-2111 ext 88139
Contact: Bryce Knapp 807-620-0441

Canada, Ontario
Exercise Nutrition Laboratory (Western University) Not yet recruiting
London, Ontario, Canada, N6A 3K7
Contact: Peter Lemon, PhD    519 661-2111 ext 88139   
Sponsors and Collaborators
Western University, Canada
Principal Investigator: Peter Lemon, PhD Western University, Canada
  Study Documents (Full-Text)

Documents provided by Peter Lemon, Western University, Canada:
Informed Consent Form  [PDF] December 1, 2017