Intermittent fasting may cut cancer risk in obesity
NCT ID NCT05114798
First seen Jun 25, 2026 · Last updated Jul 22, 2026 · Updated 4 times
Summary
This study compares time-restricted eating (eating only between 12pm-8pm) to daily calorie restriction for weight loss and colorectal cancer risk reduction in 193 obese adults aged 45-70. Participants follow their assigned diet for 6 months, then a maintenance phase for another 6 months. Researchers will measure weight, body fat, and blood markers linked to cancer risk.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- time-restricted eating (intermittent fasting)
- What this could lead to
- If it works, this could offer a simple, effective lifestyle strategy to reduce obesity and potentially lower colorectal cancer risk.
- What could go wrong
- This is a mid-stage behavioral study with 193 participants, so results may not apply to everyone. Adherence to the eating schedule can be challenging, and weight loss may not directly translate to cancer prevention.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
-
194 people
The number who actually took part.
- Started
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May 2022
- Expected to finish
-
Mar 2027
An estimate. End dates often move.
- Lead sponsor
-
Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
-
45 to 70 years
- Sex
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Anyone
- Healthy volunteers
-
Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: 1. 45-70 years old, 2. BMI 30-49.99 kg/m2 3. Are up to date with CRC screening. Exclusion Criteria: 1. Have a history of renal disease, autoimmune disorders, immunodeficiency, malabsorptive disorder, significant gastrointestinal and hepatic disease, surgical change in gastrointestinal anatomy, severe ischemic heart disease, severe pulmonary disease, severe mental health disorder, eating disorder, or bariatric surgery; 2. Abuse alcohol (\> 50 grams/day), illicit drugs (other than self-reported marijuana use), or use combustible tobacco; 3. Have controlled type 2 diabetes or undiagnosed uncontrolled diabetes based on hemoglobin A1c (HbA1c) \> 9.0%; 4. Have a history of cancer treatment within the past 12 months, CRC, genetic predisposition to CRC (e.g., Lynch syndrome); 5. Have a baseline body weight \> 450 lbs (weight limitation of the DXA); 6. Are on a weight loss diet or actively involved in a formal weight loss program (e.g., Weight Watchers); 7. Are not weight stable for 3 months prior to the study (weight gain or loss \> 4 kg); 8. Are unable to keep a food diary for 7 consecutive days during screening; 9. Are night shift workers; 10. Are pregnant or trying to get pregnant; 11. Are taking drugs that influence study outcomes (weight loss medications); 12. Are non-English speaking 13. Are taking anticoagulant medications or medications with endoscopic risk 14. Are taking antivirals or immunosuppressant medications 15. Don't have regular access to an email address and computer/smartphone/tablet 16. Are currently following a diet that requires fasting on a weekly basis 17. Currently eat for less than 10 hours of the day (determined by asking participants what time they start and stop eating on a usual day)
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
University of Illinois at Chicago
Chicago, Illinois, 60612, United States
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