Time Restricted Eating Weight Loss Research Study

Researchers at the University of Colorado Anschutz Health and Wellness Center are conducting a 12-month compensated research study to learn more about the best eating patterns for weight loss.

Fast Facts

Generally Healthy Adults 18-65 Years Old

Typical eating duration >12 hrs per day

Have excess weight (BMI 27-45 kg/m2)

Compensation Provided

Conducted at the Anschutz Medical Campus

Study Background

When it comes to weight loss, when is the best time to eat? 

This research study aims to learn if eating only within a specific 8-hour window each day is more effective for weight loss than reducing calorie intake by approximately 30% every day.  We want to learn more about the effects of early vs. late time restricted eating (commonly referred to as intermittent fasting) as compared to daily caloric restriction for weight loss and improving metabolic health.

All participants will receive a free 12-month structured weight loss program led by a registered dietitian that includes diet and exercise recommendations. Join our compensated weight loss study today!

Additional Information

The purpose of this research is to learn more about how eating patterns impact weight loss. 

You may qualify for this study if you meet the following criteria.

Key Criteria:

  • 18-65 years old
  • Generally healthy (no diabetes or heart disease)
  • BMI 27-45 kg/m2
    • Calculate your BMI here
  • Interested in losing weight
  • Not pregnant or breastfeeding
  • No regular tobacco use (or have not used tobacco in the last 3 months)
  • Not working night shifts
  • Typical eating duration >12 hrs per day (ex: time of first food/drink intake at 6 AM & time of last food/drink intake at 8 PM = 14 hours eating duration)
  • Not taking medications that affect weight in the last 6 months

*The criteria listed above is only a partial list of all the requirements to participate in this research study.  Only a clinical research staff member can determine eligibility.

If eligible, this 52-week (1 year) study involves:

  • Being randomly assigned to one of the three dietary interventions – each designed to support weight loss over 12 months.
  • Regular weekly or biweekly group meetings in-person or online guided by a registered dietitian.
  • 2-3 initial visits (for screening study assessments)
  • Regular clinic follow-up visits throughout the 12-month weight loss program for weight and other general assessments.


All participants will receive a 12-month weight loss program that includes diet and exercise recommendations. 

Generally, there is no cost for you to participate in the research study.