Northwestern University

Chicago, IL

Northwestern 1

Clinical Research Site Address (where participants are seen)
D2d Study
645 N Michigan Avenue, Suite 530
Chicago, IL 60611

Click Here for Direction to the Clinical Site

Site Enrollment Status: Recruiting

If you are interested in joining D2d as a study participant in the Chicago area, please call or email:
312-503-3413 | d2d@northwestern.edu


*To see if you qualify for D2d at the Northwestern University site, click here.  If you are eligible, please contact us via the phone number or email provided above.*


Local Media Coverage:


Jan 9, 2014 – Medical Xpress Testing whether vitamin D delays onset of diabetes

Jan 8, 2014 – Northwestern University Testing Whether

Oct 21, 2013 – eNews Park Forest Large Study to Examine if Vitamin D Prevents Diabetes


Site Principal Investigator – Lisa M. Neff, MD MS | Dr. Lisa Neff is an Assistant Professor in the Division of Endocrinology, Metabolism and Molecular Medicine at Northwestern University. She earned her B.S. in German and Biology from Tufts University in 1994 and her M.D. from the University of Illinois at Chicago (UIC) in 1999. Dr. Neff completed a residency in Internal Medicine at UIC in 2002 and fellowships in Endocrinology and Clinical Nutrition at Tufts-New England Medical Center in 2006.  Upon completion of her fellowships, Dr. Neff joined the Clinical Scholar Program at the Rockefeller University in New York, earning a Master’s Degree in Clinical and Translational Research. Dr. Neff’s research has largely focused on nutritional interventions for the treatment of obesity and related metabolic disorders.  In addition to the D2d study, her current work includes a study investigating changes in body temperature and brown fat activity in response to weight loss in obesity.  Dr. Neff also provides patient care in Northwestern’s Center for Lifestyle Medicine.

Jenny LewandowskiSite Research Coordinator – Jenny Lewandowski, MS, RD, LDN | Jenny earned her B.S. in Food Science and Human Nutrition from University of Illinois at Urbana-Champaign and her M.S. in Clinical Nutrition from Rush University. Jenny joined the D2d team following a project management role supporting national cancer research groups in the United Kingdom. Her previous research experience also includes coordinating clinical trials that evaluated lifestyle modification and therapeutic drug intervention in obesity, diabetes and hypercholesterolemia.