for people ages 18 years and up (full criteria)
at San Francisco, California and other locations
study started
estimated completion
Uma Mahadevan



This protocol is designed to compare the effectiveness of two dietary interventions for patients with Crohn's disease (CD): the Specific Carbohydrate Diet (SCD) and a Mediterranean style diet (MSD) that has been demonstrated to have numerous other health benefits. The two diets will be compared in terms of their ability to resolve both the symptoms and bowel inflammation that characterize this debilitating disease.

Official Title

Open Label, Randomized, Multicenter, Comparative Effectiveness Trial of Specific Carbohydrate and Mediterranean Diets to Induce Remission in Patients With Crohn's Disease


Crohn Diseasedietspecific carbohydrate dietMediterranean style dietrandomized controlled trial


You can join if…

Open to people ages 18 years and up

  1. Age ≥18
  2. Documented diagnosis of Crohn's disease
  3. sCDAI score >175
  4. Access to a computer with internet and the ability to complete daily online surveys
  5. Capable of providing consent to participate
  6. Able to receive weekly food shipments delivered every Friday for 6 weeks

You CAN'T join if...

  1. Pregnancy
  2. sCDAI >400
  3. Hospitalized patients
  4. Anticipated need for surgery within 6 weeks of randomization
  5. Use of the Specific Carbohydrate Diet within 4 weeks of screening
  6. Start or change dose of thiopurines (azathioprine and 6-MP), methotrexate, natalizumab, or vedolizumab within 12 weeks prior to screening
  7. Start or change dose of anti-TNF agents (including infliximab, adalimumab, certolizumab pegol, golimumab) or ustekinumab within 8 weeks prior to screening
  8. Start or change dose of corticosteroids within 1 week of screening or a dose >20mg/day prednisone or equivalent*
  9. Use of antibiotics within 2 weeks of screening.
  10. . Known symptomatic intestinal stricture.
  11. . Presence of an ostomy
  12. . Baseline stool frequency >4 bowel movements/day when well
  13. . BMI <16
  14. . BMI ≥40
  15. . Celiac disease
  16. . Documented C difficile colitis within four weeks of screening
  17. . Diabetes Mellitus requiring medication
  18. . Albumin<2.0mg/dl, within 4 weeks of screening (if tested as part of routine clinical care)
  19. . Known allergy to nuts
  20. . Other conditions that would be a contraindication to any of the study diets or preclude the participant from completing the study.
  21. . Currently participating in another clinical trial of a drug to treat IBD or a dietary therapy for any indication.
  22. Patients may continue these medications at stable dose for the first six weeks and budesonide may be used at any dose. After the 6th week in the study, patients may taper their steroid dose. The study will provide a recommended taper schedule.


  • UCSF Colitis and Crohn's Disease Centeraccepting new patients
    San FranciscoCalifornia94115United States
  • University of Utahaccepting new patients
    Salt Lake CityUtah84112United States

Lead Scientist

  • Uma Mahadevan
    Dr. Mahadevan completed a medical degree at the State University of New York in Brooklyn. She completed residency in internal medicine at Mount Sinai Medical Center in New York, a fellowship in gastroenterology at the University of California, San Francisco (UCSF) and a fellowship in inflammatory bowel disease (IBD) at the Mayo Clinic in Rochester, Minnesota.


accepting new patients
Start Date
Completion Date
University of Pennsylvania
Study Type
Last Updated