• Free Consultation
  • Walk-ins Welcome
  • Diet Pills as Low as $30/week after Physician Medical Clearance and Approval
  • Safe, FDA Approved Medication to Increase Metabolism and Decrease Hunger
  • One-on-One Nutritional Counseling and Behavioral Modification
  • Free Vitamin B-12 Injections/Supplements (existing patients)
  • Save Money with our Referral Program
  • Get Inspired by our Online "Before & After" Gallery
  • ​​Se Habla Español
  • Free on-site Parking available
  • We accept cash, checks, American Express, Visa, MasterCard and Discover

Welcome to Diet Doctors

Award winning Medical Weight Loss Center in Los Angeles

Colleen Phillips, Ph.D. would like to welcome you to Diet Doctors, the award winning Medical Weight Loss Center in Canoga Park, Los Angeles, California.

We have been at our same location since 1984 helping people to lose weight and to feel healthier. We offer SAFE, FDA APPROVED DIET MEDICATION (after physician medical clearance and approval), Vitamin B-12 injections/supplements, along with nutritional advice and behavior modification. Our Board Certified Physician/Owner, our Staff Physicians, Nutritionist, and caring Nurses are always here to assist you with your nutritional and weight loss goals.

BEST OF LA: Best Weight Loss Center 
2004, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023

BEST OF LA: Best Nutritionist 
2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
​2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023

Daily News: 2009 Who's Who in Business

Warner Center News / Valley Vantage / Las Virgenes Enterprise:
Healthy New Year!
 January 15, 2015 issue

Copyright © 1984-2022 DIET DOCTORS MEDICAL MGMT., INC.. All rights reserved.

Diet Doctors Medical Mgmt., Inc.
21103 Vanowen St, Canoga Park, CA 91303
(between De Soto & Canoga)
Phone:     (818) 346-9600

Physicians are always available and on site.
Medical Supervision is provided by Board Certified Physicians!
Diet Doctors Medical Center is physician owned and licensed by the Medical Board of California.

Nutritional counseling and medical management provided by Colleen Phillips dba Valley Warner Medical Mgmt., Inc.
Please visit our website for more detailed information! 

Dr. Colleen Phillips, Ph.D.


     We are open:

  • Monday:  9am - 6:45pm
  • Tuesday-Friday:  9am - 6pm
  • Saturday:  9am - 1pm