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.

Clint Van Nagel, PhD

Dr. Clint Van Nagel received his Ph.D. from the University of Pittsburgh. Dr. Van Nagel has lectured both nationally and internationally. His work with competency-based training programs won the American Association College Teacher Education Award in 1979 and the Florida Teacher Education Award in 1980. His research on vocational training was selected by the Michigan Project (funded by the U.S. Department of Labor and Justice) to be filmed and disseminated throughout the United States. In 1989, Dr. Van Nagel received the Nation University Continuing Education Award for his outstanding presentations and program development. In 1990, he was selected by students and colleagues at the University of North Florida to receive the Outstanding Teacher Education Award. In 1993, he was chosen as a recipient of the Creative Programming Award by the Conferences and Institutes Division of the National University Continuing Education Association for his program, Dealing With Angry and Emotional People: For Law Enforcement Personnel. Dr. Van Nagel has state, national, and international publications that deal with training individuals for increased performance and achievement. He has presented his research and training methods to nine international associations and has conducted over 800 seminars that deal with the development of human potential. Dr. Van Nagel was selected by seven major state associations to be their keynote speaker. Dr. Van Nagel stays abreast of the latest trends in corporate training and delivers insight into those trends. He is considered by his peers to be on the forefront of leadership and executive training, and he is one of the most sought after trainers in the United States because of his innovative teaching strategies and his ability to communicate to different people on different levels.

A partial list of Dr. Van Nagel's clients includes; CSX, Blue Cross/Blue Shield, Florida Department of Law Enforcement, Florida Department of Environmental Protection, AT&T, International NLP, Federal Reserve, St. Luke's and Baptist Hospitals of Jacksonville, Florida, Charter Hospital of Georgia, Georgia Psychological Education Centers, and Prudential Securities. Dr. Van Nagel's goals are to simplify the complex and to improve the quality of life for all.

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.

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!"


44 lbs and 80 inches!!!!! I NEVER could have done this without you ladies. They taught me how to eat. They are encouraging and motivational. Even when I wanted to give up they helped me over come my discouragement of the plateau I hit. 2 thumbs up for the ladies here and the MRC program!!!! I have tried numerous other plans from workouts to diets and mixing the 2. Nothing worked before I started at MRC.


★ ★ ★ ★ ★
5 / 5 stars

Have a question? We can help! Leave us a message and we'll get back to you shortly. Leave your telephone number to have a weight loss consultant return your call. Thank you!

Loading Form..