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Advisory Board

We Stand Behind the Research in Metabolic Research Center


Metabolic Research Center's weight loss programs were created by board certified physicians, research scientists and registered dietitians who wanted to design medically sound, evidence based weight loss programs which allow individuals to maintain a healthy lifestyle. We approach the science of weight loss and weight management from a clinical, research-based perspective. Our programs are based on decades of scientific research in the fields of medicine and nutrition. We strive to provide excellent customer service through personalized weight loss programs with a focus on supporting our client's health. It is our goal to stay current with the latest research related to weight loss, psychology, hormones and nutrition. Our Medical Advisory Board is comprised of a wonderful group of experts in all of the areas that impact your weight loss journey, including board certified physicians, registered dietitians, nurse practitioners and licensed clinical social workers. Our 70+ weight loss centers are individually owned and operated throughout the United States.

Robert Oesterle, MD

Robert Oesterle has been practicing medicine for over 23 years. Completing his internship and residency at the University Medical Center in Jacksonville, FL, he specialized in Internal Medicine. Robert continued his fellowship at the University Medical Center, this time with a focus on endocrinology, metabolism, and hypertension. This expert knowledge in internal medicine makes Robert a perfect fit for the MRC team.

As a physician, Robert Oesterle sees the impact of excess weight on a person's life and health day in and day out. He knows that weight loss is much more than simply changing eating habits. Metabolic Research Center provides the nutritional advise, expertly designed weight-loss menus, one-on-one support, motivation, and the education a client needs to be successful. Robert knows firsthand how knowledgeable the Weight Loss Specialists at the center are. Combined with their supportive and encouraging demeanor that mirrors his own, Robert is proud to be an advising member of the medical board at MRC.

Allan N. Spreen, MD

Though Dr. Spreen’s interest in nutrition and health began in his teens, it was the affliction of a family member that turned this interest into a passion, and ultimately his profession. A competitive springboard diver at Georgia Tech, he was personally affected by the connection of health and performance. Later, as he transitioned from athlete to coach in the 1970s, he enlightened other athletes eager to maximize their own physical performance. So, when his sister was diagnosed schizophrenic as a sophomore in college and the mainstream medical community offered no hope of recovery, his family was unwilling to accept that she would spend the rest of her life institutionalized. Instead they sought alternatives, eventually finding Canadian physician Abram Hoffer, MD/PhD, who treated schizophrenics with high doses of B-3 and other supplements. As Dr. Spreen watched his sister recover, and subsequently attend law school and begin her law practice, his enthusiasm for non-conventional health therapies intensified. His sincere desire to understand and fairly evaluate both conventional and alternative therapies eventually led to him to a degree from East Tennessee State University medical school in 1982.

In his private practice, limited primarily to nutritional therapies, he counseled patients who preferred alternative options to traditional allopathic techniques. He often found that his weight loss patients were those most likely to follow his recommendations. Like the athletes he coached, their progress in health was measurable: they lost weight, felt better physically, and felt better emotionally about themselves. Dr. Spreen’s background in successful weight loss with his own protocols, supplements, and clinical trial evaluations has made him a unique asset for MRC.

In 1995, to allow him more time for research and coaching, he launched “The Nutrition Physician,” an information service for alternative and complementary medicine. Soon after authoring his signature books: Nutritionally Incorrect, written in his uniquely humorous style, and the bestselling collaboration with Dr. Janet Zand, Smart Medicine for Healthier Living, Dr. Spreen accepted a position as Director of Scientific Research with Metabolic Research Centers. Always on top of the latest in health research, he evaluates products and works with our other on-staff experts to offer optimal results, while proposing alternative products and formulas to better serve our clients.

Dr. Spreen believes we can all improve our health and we can all reach our optimal weight. Many question the expense and necessity of supplementation in a weight loss program. Dr. Spreen explains that the foods we eat do not have the nutritional value of the foods our grandparents and great-grandparents either raised themselves or to which they had ready access: “Large scale fertilizers, pesticides, and hybridization have wrecked the quality of our food supply. Organics are not always available, nor affordable. Our environment has more pollution and our culture more stress than in ‘the good ol’ days’. Smart supplementation can help a body overcome many of the stresses of modern life and begin to improve overall health. That is what I hope to offer all MRC clients.”

Dr. Spreen’s guidance has been valuable to MRC in both the past, present, and into the future.

Sharon Blumenthal, FNP

Sharon Blumenthal graduated with a Bachelor of Science in Nursing from the University of Miami in 1985 and became an RN. In 2008, she expanded her nursing education and knowledge with a Master of Nursing from Regis University; graduating with Honors. She is a member of DNA #30, Nurse Practitioner Organization Colorado Branch and has also served on the faculty of Regis University in a clinical setting from 2011-2016.

With over 10 years of experience working with Metabolic Research Center and its clients, Sharon is truly an advocate for MRC clients and passionate about helping them achieve their health goals; stating, "I relate very well to the clients at MRC with their desire to gain a healthy lifestyle through our programs." Always practicing what she preaches, Sharon has seen personal success with MRC's programs! When she's not traveling to MRC centers to work with clients, Sharon enjoys hiking, yoga, playing the saxophone, cross-fit, participating in the Denver Book Club, and spending time with her basset hound in her free time.

Carol Kazounis, RD, LDN

Registered & Licensed Dietitian

Carol Kazounis is a Registered and Licensed Dietitian (RD, LDN). Graduating from UNF (University of North Florida) with a Bachelor's of Science in Nursing (BSN), Carol specialized in Nutrition. Prior to joining the Metabolic Research Center team, she worked for over six years as a diabetes educator. For Carol, this work was very personal and close to her heart; having a grandmother who battled fiercely with the disease.

Carol has personally experienced the power of MRC programs, having lost weight following the births of her two children. She also has many friends who have seen great success with the program, too. Carol is passionate about her work with MRC, exclaiming, "I am so proud to be able to help a broader audience realize their best selves through the Metabolic program - just like I was for so many years!"

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The easiest and most effective weight loss program I have ever done!

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