Endoscopic Weight Loss Program
Hoag Digestive Health Institute
(949) 764-4624
- About
- Meet the Team
Hoag offers comprehensive endoscopic and surgical bariatric care in Orange County, with the largest Advanced Endoscopy Program in the West. Our team delivers full weight management support, empowering your journey with expertise and personalized care.
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Trust Hoag for Nationally Recognized, World-Class Care
Hoag is ranked high performing in Gastroenterology & GI Surgery by U.S. News & World Report. The organization was ranked the #5 hospital in the Los Angeles Metro Area and the #10 hospital in California, and is the only Orange County hospital in the top 10.
Nationally Accredited Bariatric Program
Having earned the confidence, respect and trust of patients making a lifetime commitment to healthier living, Hoag is recognized as a nationally accredited metabolic & bariatric surgical center by the American College of Surgeons.
Advantages of Endoscopic Weight Loss Procedures
Endoscopic weight loss procedures are a newer type of minimally invasive, non-surgical procedures. A small, flexible scope with a camera and suturing device is inserted through the mouth, so there are no cuts or incisions needed. Generally, endoscopic procedures for weight loss have a lower risk of complications and quicker recovery time than surgery, so patients can recover at home rather than requiring an inpatient stay.
Types of Endoscopic Weight Loss Procedures Offered
ESG is a minimally invasive weight loss procedure for people with no prior history of bariatric surgery. Hoag’s advanced endoscopists use an endoscopic suturing device to reduce the size and volume of the stomach by as much as 80%. On average, patients who choose to have an ESG lose 11-20% of total body weight over 6-12 months. This procedure is for patients without prior bariatric surgery.
Patients with prior history of bariatric surgery who experience weight regain may benefit from a weight loss procedure such as a Transoral Outlet Reduction (TORE) or a sleeve revision. These minimally invasive procedures are typically outpatient procedures with a recovery time of 3-5 days. Patients may experience remission of obesity-related diseases such as hypertension, diabetes, and metabolic-associated liver disease.
Transoral Outlet Reduction (TORE) is a weight loss revision procedure performed on patients who have had a prior Roux-en-Y Gastric Bypass and have experienced weight regain. It’s a good option for patients who have developed an enlarged gastric pouch or who have a dilated stoma. Patients may lose 8-10% of their total body weight in 6-12 months.
A Sleeve Revision is a weight loss revision procedure performed on patients who have had a prior sleeve gastrectomy and have experienced weight regain. It is a good option for patients who have developed an enlarged sleeve. Patients may lose 12-15% of their total body weight in 6-12 months.
Am I a candidate for endoscopic weight loss procedures?
In most cases, candidates fit the following criteria:
18-70* years of age
Body Mass Index between 30-50*
Weight less than or equal to 500 lbs
Ambulatory
No pregnancy or planned pregnancy within 1 year of procedure
No active malignancy currently being treated
No active substance abuse
*Exceptions can be made following discussion with endoscopist
Digestive Health Institute Locations
Hoag Memorial Hospital Presbyterian
- 500 Superior Avenue, Suite 100
- Newport Beach, CA 92663
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Contact usBariatric Endoscopy
Our team is comprised of multidisciplinary professionals committed to assisting you through your weight loss journey. The Hoag Endoscopic Weight Loss Program offers the highest quality patient care and the latest innovations in minimally invasive weight loss procedures with incredible outcomes from world-renowned physicians.
Bariatric Endoscopy Team
Jennifer Phan, MD
Medical Director, Hoag Irvine Advanced Endoscopy, Director of Bariatric Endoscopy, Gastroenterologist
Kenneth J. Chang, MD
Executive Medical Director, Hoag Digestive Health Institute
Phuong T. Nguyen, MD
Medical Director of Hoag Advanced Endoscopy Center, Gastroenterologist
Obesity Medicine Physicians
Diana W. Zhao, MD
Dr. Diana Zhao is an endocrinologist who provides treatment for obesity and weight management, diabetes, as well as other endocrine disorders. After earning her medical degree at Medical College of Wisconsin, she returned to Southern California to complete an internal medicine residency at LAC + USC Medical Center, followed by a fellowship in Endocrinology at Harbor-UCLA and City of Hope Medical Center. During the COVID-19 pandemic she worked as a hospitalist and served as clinical instructor at the UCLA School of Medicine which greatly broadened her clinical experience. She sees patients with many types of endocrine disorders and has a clinical interest in obesity medicine. She values every interaction with her patients. Dr. Zhao finds it rewarding when she can educate her patients in a way that they understand. She strives to relieve her patients’ burdens of chronic metabolic diseases with both a shared decision making and an evidence-based approach. Dr. Zhao is excited to have returned to her hometown of Irvine to serve Orange County residents. Having grown up in China, Dr. Zhao is fluent in Mandarin. During her free time, she enjoys yoga, traveling and spending time with her husband and son.
Tanzila S. Razzaki, MD
Dr. Razzaki is an endocrinologist specializing in providing treatment for obesity, type 2 diabetes, and other metabolic and endocrine disorders. She is triple board certified in Endocrinology, Diabetes, and Metabolism; Obesity Medicine; and Internal Medicine. After completing her Internal Medicine residency and Endocrinology fellowship at Rutgers New Jersey Medical School, Dr. Razzaki expanded upon her specialty areas by completing a second fellowship in Obesity Medicine at Weill Cornell Medical College in New York City. Dr. Razzaki is a leading expert in Obesity Medicine, Type II Diabetes Mellitus and Metabolic Syndrome. She has been a key contributor to research studies related to obesity and diabetes mellitus and has published her work in peer-reviewed journals.
Clinical Support Professionals
Nurse Practitioners
Physician Assistants
Registered Nurses
Bariatric Nurse Navigator
Registered Dietitians
Neuropsychologists/Psychologists/Licensed Clinical Social Workers
Exercise Physiologists and Physical Therapists
Additional Specialty Areas
Gastrointestinal
Cardiology
Sleep Center
Hepatology
Internal Medicine
