About Us

Meet our team of Gastroenterologist & Nutritionists

Our staff is licensed and has over 20 years of experience.

Erick Alayo, M.D.

Gastroenterologist

Dr. Erick Alayo's special interests are those conditions that affect your liver and pancreas. In addition to his clinical skills, Dr. Alayo has a large experience in clinical research with many publications, awards and grants through his career. Dr. Alayo's gastroenterology practice is located Southern California and services the people of Chula Vista and San Diego.


We Practice Evidence Based Medicine

Evidence-based medicine (EBM) aims to apply the best available evidence gained from the scientific method to medical decision making. It seeks to assess the quality of evidence of the risks and benefits of treatments (including lack of treatment).

View Dr. Alayo's CV

Judy Paraiso-Barron

Senior Clinical Research Coordinator

Judy is a Senior Clinical Research Coordinator with 19 years of clinical research experience, the past 10 years involve over forty phase II - IV clinical trials designed for individuals with gastrointestinal diseases. In addition to her research coordinator role, Ms. Barron has expertise in the regulatory requirements needed to conduct a clinical trial, She has extensive working knowledge of clinical research trials inclusive of procurement, program management, study start-up, recruitment tactics and challenges, clinical trial management, employee retention strategies, and audit processes. 

Marilyn Rodriguez 

Clinical Research Coordinator

Marilyn is a Clinical Research Coordinator here at GastroSB with 8 years of helping Patients Coordinate their healthcare, and help find a perfect Trial in which suits them best. Specializing in Clinical Research trials with an emphasis in GI, Marilyn uses that experience to help move Science forward and create drug development while abiding by GCP & GDP.


"By focusing on our South Bay underserved community I'm proud to say that I've helped make a difference in reaching this population while providing quality health care to those uninsured/underserved". – Marilyn Rodriguez

Naria Le Mire

Registered Dietitian

Naria Le Mire is a bilingual registered dietitian (RD) from San Diego, CA. She began her educational endeavours by attending San Diego State University (SDSU) in California. Here she obtained her bachelor's of science (B.S.) degree in Foods and Nutrition in addition to a minor in Business Management. While a student, Naria enjoyed serving culturally diverse populations via volunteering in various groups including the Student Nutrition Organization (SNO) and Women Infants and Children (WIC). Moreover, her passion for research led her to work with various professors to further enhance her understanding of empirical data and research.


Following these achievements, she completed a comprehensive dietetic internship and passed the board exam by the Commission of Dietetic Registration (CDR) to become an RD. After serving the community for several years, Naria decided to further her education and return to SDSU. She decided to pursue a master's degree in public health (M.P.H.) with a focus in Health Promotion and Behavioral Science to better support her patients to achieve their health goals using sustainable lifestyle modifications.



Naria has vast experience serving culturally diverse populations from volunteer and work experiences. Naria has served patients with various health conditions including overweight and obesity, type two diabetes, cardiovascular diseases including hypertension, gastrointestinal disorders, food intolerances and more. Naria's passion resides in educating her patients to develop a healthy relationship with food via gradual lifestyle changes.

What Our Patients Are Saying About Dr. Alayo

Losing weight was very difficult for me until I came to Dr. Alayo’s clinic. I lost 11 pounds in one month with diet modification and weight loss medications.

Diet Testimonial – B.S., Patient

I am very grateful with the service that Dr. Alayo and his staff provided to me.

Weight Loss Clinic Testimonial – J.J., Patient

Top of the line staff very friendly and willing to cooperate with any unexpected changes. Dr Alayo is very professional. Happy to be his patient.

Weight Loss Clinic

Testimonial – A.D., Patient

Our team is committed to the well-being and health of all our patients.

Benefits of GAME

Research began in the early 1990’s as a division of GCSA (Gastroenterology Clinic of San Antonio). As faculty at the medical school we had a desire to help patients that had diseases and disorders that conventional medicine had no cure for. Additionally, through grants we were able to provide care for patients whom standard therapies were unaffordable. As our research led to publications and national recognition more research grants became available and we soon formed a separate entity known as GERSA (Gastroenterology Research of San Antonio) with a dedicated clinical research lab and staff whose sole purpose is to conduct research and render care to our patients enrolled in trials.


These efforts have brought many medications to market that are now helping millions of people worldwide. We generally have 10 molecules we are studying at any one time. We also have developed novel endoscopic techniques that have prevented invasive surgeries.

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