Early vs. Late Time Restricted Eating vs. Daily Caloric Restriction

Inclusion Criteria: * Adult males and females with a BMI of 27-45 kg/m2 * Age, 18-65 years old * Passing medical and physical screening, and analysis of blood and urine screening samples * Individuals who are not currently following an intermittent fasting or TRE dietary regimen (i.e., eating across less than a 10-hour period during the day). * Own a smartphone * Live or work within 45 minutes of the Anschutz Health \& Wellness Center (exceptions may be made at the discretion of the Study PI on a case-by-case basis for highly motivated subjects) * No plans to relocate within the next 12 months * Capable and willing to give informed consent, understand exclusion criteria, and accept the randomized group assignment. * Have a primary care physician (or are willing to establish care with a primary care physician prior to study enrollment) to address medical issues which may arise during screening or study procedures/interventions. Exclusion Criteria: * Pregnancy or lactation for women (women who are \>6 months postpartum with no plans of becoming pregnant in the next year and who are not currently lactating can be included; oral contraceptives will be allowed if medication has been consistent for the prior 6 months) * Weight loss \>5kg in past 3 months for any reason except post-partum weight loss, weight gain \>5kg in past 3 months requires assessment by PI to determine reason for weight gain and if it is appropriate for the subject to participate in the study * Weight loss o…