Yes, you can volunteer for a time-restricted eating study if you match its health rules. Open trials are recruiting through university pages and ClinicalTrials.gov, and you apply by contacting the listed study site. Time-restricted eating (TRE) limits all eating to a steady daily 8- to 10-hour window without necessarily cutting calories, according to Johns Hopkins Medicine's September 2026 summary.
Studies focus on different groups, including older adults, people with obesity, and patients in cancer treatment. Each trial sets its own age, health, diagnosis, and schedule rules. You find a fit by searching the right terms and checking those rules before you contact anyone.
Official resources:
- View the official study record on ClinicalTrials.gov — Use this record to verify the study status and eligibility details.
- View the official study record on ClinicalTrials.gov — Use this record to verify the study status and eligibility details.
Table of Contents
- What does TRE involve day to day?
- Which studies need participants?
- Could you qualify?
- How do you join through ClinicalTrials.gov?
What does TRE involve day to day?
You eat only inside a set daily window and fast the rest of the day. ClinicalTrials.gov describes one approach as eating only within a set window and water-fasting the rest. A 10 a.m. to 6 p.m.
schedule is one common form of an 8-hour window. Some trials test TRE without calorie restriction. Others compare TRE directly against daily calorie restriction for weight loss and disease-risk markers. Your eating window, fasting rules, and tracking duties depend on the group you join.
Which studies need participants?
UC San Diego's TREAD study randomizes participants into two prolonged nighttime-fasting groups for 6 or 12 months to test meal-timing effects in Alzheimer's disease, according to UC San Diego's TREAD study page. It enrolls people with mild cognitive impairment or early Alzheimer's disease, plus healthy living partners or spouses as comparison participants.
Thomas Jefferson University sponsors recruiting phase II trial NCT05327608, listed on ClinicalTrials.gov, testing TRE during neoadjuvant chemotherapy in 55 patients with stage I-III breast cancer and BMI 25-40. Another ClinicalTrials.gov trial, NCT05114798, compares TRE against calorie restriction for weight loss and colorectal-cancer risk markers in adults with obesity. The details on the Jefferson breast-cancer trial page show how narrow diagnosis, stage, and BMI rules can be.
Could you qualify?
Many TRE trials exclude people with eating disorders, pregnancy, unstable medication use, or unsafe fasting risk. The National Institute on Aging also states there is insufficient evidence to recommend any calorie-restriction or fasting diet, in its review of fasting-diets evidence. Check these points before you apply:.
- Diagnosis, age, BMI, and medication rules for that trial
- Whether a partner, spouse, or caregiver must join with you
- Fasting length, eating window, and daily tracking load
- Pregnancy, eating-disorder history, and medical-safety exclusions
- Clinic visits, time commitment, travel, and payment terms
How do you join through ClinicalTrials.gov?
Search ClinicalTrials.gov for "intermittent fasting," "time-restricted feeding," or "calorie restriction," as suggested by the National Institute on Aging and UC San Diego. Filter by location, age, and eligibility, then open the record.
Contact the listed site directly through the phone number or email shown. Use these steps to avoid wasted applications: UCSD also points healthy volunteers to its local healthy-volunteer study browser for TREAD and similar openings.
- Save 2-3 trials that match your health status and schedule
- Read the full eligibility list and visit schedule
- Send one clear message with age, diagnosis, BMI, and city
- Ask about screening, consent, fasting support, and withdrawal rules
