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Our Doctors

Board-certified doctors, who spend time working in the field and shaping the future of medicine, are the only people you can truly trust with your health. That's why 1MD is proud to work with top physicians. These doctors care deeply about bettering the lives of people through research, study and clinical practice.

Dr. David Kahana M.D.

Dr. David Kahana is board certified in Pediatrics and Gastroenterology through the American Board of Pediatrics (ABP), as well as Medical Nutrition through the National Board of Physician Nutrition Specialists.

He was trained in Chicago, Israel, Minnesota, and UCLA, where he was also faculty for several years before opening his Center for Digestive Health & Nutritional Excellence in Torrance, CA, in 2011. Dr. Kahana is published in peer-reviewed journals and has written for multiple medical textbooks. He serves on national committees for nutrition and inflammatory bowel disease and also runs a colon cancer prevention program for LA County. Dr. Kahana is married and has a one-year-old at home; he enjoys travel, sports (especially basketball and hiking), music and dance.

Dr. Kahana has a strong interest in medical nutrition and practices nutritional therapy of many gastrointestinal conditions such as inflammatory bowel disease (IBD), irritable bowel syndrome (IBS), gastroesophageal reflux, chronic constipation, Celiac disease, food allergy and intolerance, eosinophilic esophagitis, as well as gastrointestinal disorders in Autism. Approaching disease with a holistic perspective, Dr. Kahana strives to integrate complementary medicine with conventional practice, while working with dietitians and nutritionists to provide patients with a comprehensive insight into overall health.

Dr. Kahana is skilled in upper endoscopy, colonoscopy, capsular endoscopy, liver biopsy, esophageal pH probe monitoring, and is testing new techniques for studying microbial influences on health and disease. He loves to teach and offers many lectures on topics such as nutrition, inflammation, and the impact on health, probiotics and prebiotics, food intolerance and the benefit of a hypoallergenic diet, among others. Formally at Harbor- UCLA Medical Center, Dr. Kahana is now the Medical Director at The Center for Digestive Health & Nutritional Excellence, located in the South Bay in Torrance, CA, with a focus in clinical care on medical nutrition.

Dr. Kahana is a member of the following academies and societies:

  • American Academy of Pediatrics (AAP)
  • American Medical Association (AMA)
  • American Society for Parenteral and Enteral Nutrition (ASPEN)
  • North American Society for Pediatric Gastroenterology Hepatology and Nutrition (NASPGHAN)
  • American Gastroenterology Association (AGA)
  • American College of Gastroenterology (ACG)
  • Crohn’s and Colitis Foundation of America (CCFA)

Dr. Kahana also volunteers as a medical consultant for a non-profit organization called What’s In Your Lunchbox (WIYLBox) and as a medical provider for a specialty camp for children with chronic illnesses called The Painted Turtle Camp. Dr. Kahana was recently elected to be the Treasurer/Secretary of the Board of Directors for the National Board of Physician Nutrition Specialists. He also sits on the Nutrition Committee for the Providence Hospital Network, where he is helping establish a nutrition program for patients with IBD.

Dr. Brian Greenberg M.D.

Brian Greenberg MD is a UCLA trained Pediatrician and Allergist/Immunologist who has practiced medicine in Southern California for almost 25 years. He has taken care of thousands of children and adults with a variety of allergic disorders with particular expertise in treating difficult asthma and out-of-control eczema.

He is the owner and President of The Pediatric Group and The Allergy Group of Southern California with five doctors and two Pediatric Nurse Practitioners located in Tarzana and Agoura Hills, California. The Pediatric Group has pioneered progressive patient oriented treatments, technologies and services such as home visits for newborns, developmental screening at each age, utilizing the body's own immune system to promote healing, as well as being an early adopter of electronic medical records (in 2007).

As an innovator in promoting private medical practice, Dr. Greenberg is also the founder and President of Medical Practice Purchasing Group (MPPG) a physician buying group representing over 2,000 doctors in 20 states.

In addition to extensive lecturing on asthma and allergies, Dr. Greenberg has provided consultation services to other small medical practices helping them form and improve their efficiencies.

Dr. Greenberg has served on numerous national and regional physician leadership organizations including the Boards of the California and Los Angeles County Medical Associations, the American Medical Association and California Medical Association Councils on Legislation as well as the President of Valley Health Medical Associates, a 40,000 member IPA serving patients in Southern California.

Los Angeles Magazine has named Dr. Greenberg one of their Super Docs and one of the best Pediatricians and Allergist/immunologists in Southern California.

Dr. Greenberg has teamed up with 1MD to create a groundbreaking new immune-supporting supplement to be launched later this year.

Complete Probiotics Platinum Is the Ultimate Multivitamin For Your Microbiome, Gut and Digestive System.

Krill Oil Platinum Contains A Powerful 1500mg Formulation With Boosted Levels of the Powerful Antioxidant, Astaxanthin.

Curcumin Is A Potent Antioxidant That Has Been Proven to Promote A Healthy Inflammatory Response.

Complete Probiotics Platinum Is the Ultimate Multivitamin For Your Microbiome, Gut and Digestive System.

Krill Omega Platinum Contains A Powerful 1500mg Formulation With Boosted Levels of the Powerful Antioxidant, Astaxanthin.

Curcumin Is A Potent Antioxidant That Has Been Proven to Promote A Healthy Inflammatory Response.