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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.
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.
Time-Restricted Eating (16:8)
Exercise Nutrition Laboratory (Western University)
Not yet recruiting
Western University, Canada
Published on BioPortfolio: 2017-12-13T08:34:08-0500
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Behavioral responses or sequences associated with eating including modes of feeding, rhythmic patterns of eating, and time intervals.
A disorder associated with three or more of the following: eating until feeling uncomfortably full; eating large amounts of food when not physically hungry; eating much more rapidly than normal; eating alone due to embarrassment; feeling of disgust, DEPRESSION, or guilt after overeating. Criteria includes occurrence on average, at least 2 days a week for 6 months. The binge eating is not associated with the regular use of inappropriate compensatory behavior (i.e. purging, excessive exercise, etc.) and does not co-occur exclusively with BULIMIA NERVOSA or ANOREXIA NERVOSA. (From DSM-IV, 1994)
Tools used in COOKING or EATING such as cutlery, pots, pans, and dishes.
A genus of tapeworms of the family Diphyllobothriidae, which are parasites of fish-eating cats, dogs, and birds. Infection in man is caused by eating undercooked fish. The larval form is called SPARGANUM.
Eating an excess amount of food in a short period of time, as seen in the disorder of BULIMIA NERVOSA. It is caused by an abnormal craving for food, or insatiable hunger also known as "ox hunger".