Clinical trial NCT04348019: Effects of a Daily Time-Restricted Feeding Protocol on Diet Quality
Official title: Mealtime Matters: An 8-wk Randomized-Controlled Trial to Examine the Effects of a Daily Time-Restricted Feeding Protocol on Diet Quality
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Diet, Healthy
Weight Change, Body
Dyslipidemias
Blood Pressure
Keywords: time restricted feeding
fasting
diet quality
body mass index
cardiometabolic biomarkers
Lead sponsor: Arizona State University
Sponsor class: OTHER
First posted: 2020-04-15
Enrollment: 29
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: 8-week randomized-controlled, 2-arm parallel design trial
Primary purpose: PREVENTION

Brief summary: As a result of unhealthful lifestyle practices including nighttime ingestion and excess energy-dense food and beverage intake, college students are presenting with metabolic abnormalities and excess weight gain that increases their risk for chronic health conditions including cardiovascular diseases and type 2 diabetes. Research has shown that prolonging nightly fasting intervals can result in health improvements in both animal models and human subjects. Time-restricted feeding (TRF), a form of intermittent fasting may offer an exciting, non-pharmacologic approach to improve cardiometabolic health in this population by restricting food intake to feeding windows that align with circadian biology.

Detailed description: This 8-wk randomized-controlled, parallel arm trial will examine the effects of a daily 18 h fast (TRF protocol) compared to a daily 8-h (CON protocol) on (1) diet quality, (2) cardiometabolic health, and (3) anthropometry in college students enrolled at ASU. Institutional Review Board (IRB) approval will be granted prior to recruitment and commencement of trial activities. Participants will be stratified by age, waist circumference, gender, and METS (activity score) and randomly assigned to one of two study arms: intervention and control. \[Women will begin the trial within 5 days of menses.\] Participants in the intervention arm of the study will consume food and beverages of their choice within one hour of waking and the feeding window will extend 6 hours. Beyond these hours, participants will observe a prolonged fast (i.e., an 18-h overnight fast). Participants in the control arm of the study will fast each night for 8 hours. During fasting hours, participants will only be permitted to consume non-caloric beverages (preferably water only but unsweetened and non-caloric coffee, tea, etc. will be permitted). Participants will adhere to their daily protocol for 8 weeks. Participants will not receive diet instruction other than 'to fast' and are told to maintain their typical physical activity patterns for the duration of the trial. Participants will choose one 'cheat-day' per week where they are excused from the fasting protocols; this day of the week will be consistent throughout the 8-week trial. Diet quality will be measured by the REAP-S questionnaire, 24-h recalls will be obtained by a registered dietitian via a three-step multiple-pass interview method, a registered nurse or radiology technician will obtain fasting blood draws for biomarkers, and trained research personnel will obtain measures of anthropometry.

Eligibility criteria: Inclusion Criteria:

* healthy (no unresolved medical condition)
* non-smoking (includes vaping)
* normal to under-active (\< 420 minutes of activity/week; not training for or competing in sports events)
* college students (≥18 years old)
* free of acute illnesses or diagnosed chronic diseases (by self-report)
* waist circumference ≥ 80 cm for women, and ≥ 94 cm for men. Participants will not be excluded based on race/ethnicity or socioeconomic status.

Exclusion Criteria:

* participants who regularly fast for \>12 hours/d or adhere to a fasting regimen (i.e., alternate day fasting, Ramadan-style fasting, 5:2 fasting) at the time of screening or within the past six months
* those with weight loss attempt(s) or weight change (≥ 5 lbs.) within the past six months (including pregnancy)
* those with a history of weight cycling (repeated weight loss and weight gain over time)
* those who currently work night-shifts (i.e., midnight to 6AM), and those unwilling to adhere to the protocol will be excluded from the trial
* pregnant or lactating women, and women not on prescription contraceptives (i.e., birth control pills, IUDs, and patches) (however, if a female applicant states her menstrual cycle is regular, the need to be on prescription contraceptives will be waived)

Primary outcomes:
measure: Diet quality
timeFrame: Change from Baseline at week 8
measure: Blood pressure
timeFrame: Change from Baseline at week 8
measure: Blood lipids
timeFrame: Change from Baseline at week 8
measure: Waist circumference
timeFrame: Change from Baseline at week 8
Secondary outcomes:
Other outcomes:
Locations:
city: Phoenix
country: United States
facility: Arizona Biomedical Collaborative
state: Arizona
Study officials:
References: