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We are dedicated to improving lives through individualized care.
Sarah Duke, RDN, CLT
​Sarah is a Registered Dietitian Nutritionist, Certified L.E.A.P. Therapist and co-founder of Duke Nutrition Experts. She grew up in Decatur, Indiana and earned her degree from Ball State University. She has lived in Tucson, Arizona for the past 9 years and absolutely loves living in the desert!
Sarah has worked in many areas of nutrition but her passion lies in helping people find relief from symptoms caused by chronic inflammatory conditions. She takes a functional approach to nutrition and uncovers the root cause of what is causing symptoms.
Sarah is married and has 2 young children that keep her busy. She enjoys anything outdoors, swimming, lifting weights and has earned her blue belt in Brazilian Jiu Jitsu!
Rebecca Watson, MS, RDN, CLT
Rebecca was born and raised in Mesa, AZ. She attended the University of Arizona for her undergraduate degree and completed her master’s degree in Nutritional Sciences from the University of Saint Joseph Connecticut.
Rebecca is a Certified Fertility Dietitian and has a passion for working with those who want to optimize their fertility & reproductive health through nutrition. After overcoming her own fertility struggles, she and her husband welcomed their son to the world in October 2022.
Rebecca also enjoys working with clients who have a variety of chronic inflammatory medical conditions such as fibromyalgia, RA, migraines, IBS/IBD, diabetes, obesity, and heart disease.
In her spare time, Rebecca enjoys spending time with her family & friends, watching movies, traveling, and attending the University of Arizona sporting events. Her favorite vacation spots include the beach and Disneyland. She is an animal lover and shares three funny cats, Walle, Eva & Russell, with her husband Matt and son Oliver.
Preston Harris, PhD, RDN, CLT
Preston was born and raised in Tucson, Arizona, and completed his BS, MS, and PhD in nutritional sciences at the University of Arizona, where he now teaches in the Nutrition and Human Performance program.
Preston specializes in sports nutrition and, as a former professional MMA fighter and boxer, particularly enjoys helping combat sports athletes reach their weight cutting goals while feeling strong and healthy.
Preston is a wonderfully happy father of 4 (so far), and enjoys a wide range of hobbies, including training in MMA and Jiu Jitsu, writing music, and developing and publishing board games!
Tammy Lutz, RDN, CLT
Tammy is a Registered Dietitian Nutritionist, Certified L.E.A.P Therapist joining Duke Nutrition Experts with over three decades of dedicated experience in the field of Food and Nutrition. She grew up in an Illinois farm community and earned her degree from Western Illinois University. Completing her dietetic internship at Hines VA in Chicago, Illinois led her to a fulfilling VA Career, retiring in June of 2025.
Tammy is thrilled to bring her clinical nutrition expertise to the team. She specializes in diabetes care, cardiovascular health, and gastrointestinal disorders. Tammy believes that nutrition isn’t just about restrictions, it’s about finding a sustainable balance that works for the individual. She combines decades of clinical insight with a compassionate, personalized approach to care.
Tammy is married and has 2 grown children. She enjoys Pilates, reading and cooking. Since their new retirement, Tammy and her husband are experiencing more traveling opportunities, entertaining friends and actively participating in the local Corvette club.
Jenny McDade RDN, CLT
Jenny was born into a military family in Jacksonville, North Carolina, and moved often before calling Tucson, Arizona home in 2007. She earned her degree in Nutritional Sciences from the University of Arizona and completed her dietetic internship at Banner University Medical Center in Tucson.
Jenny brings a strong clinical background from her experience in inpatient pediatric care, working with newborns through adolescence. She has helped children facing a variety of nutrition-related needs, including growth concerns, gastrointestinal conditions, food allergies and intolerances, and tube feeding. This foundation allows her to guide families with confidence in an outpatient setting while maintaining consistent care.
Her goal is to create a supportive environment where parents feel empowered, not overwhelmed, as they navigate their child’s nutrition and health.
Outside of work, Jenny enjoys spending time with her husband and two young boys, who make sure there’s never a dull—or quiet—moment, along with cooking, staying active, camping, and enjoying Arizona’s sunsets.
Elsie A. Orellano, Ph.D., RND, LND, LMT, CSOWM
Dr. Elsie is a bilingual (Spanish and English) Registered Dietitian Nutritionist with an extensive background that goes from two bachelor’s degrees to a doctorate and a postdoctoral fellowship in multidisciplinary sciences (biochemistry, neuroscience microbiology, nutrition and dietetics, among others). Born and raised in Puerto Rico, she completed all degrees at the University of Puerto Rico, including an Intercampus Program with the School of Medicine, Medical Sciences Campus.
Elsie is Board Certified Specialist in Obesity and Weight Management (CSOWM). Elsie specializes in a wide range of medical conditions and weight management when it is appropriate and desired by clients. Elsie’s clinical approach is holistic, focusing on root causes and sustainable lifestyle changes centered in nutrition, physical activity, sleep hygiene, and behavioral strategies, while also supporting medical treatment. She is recognized for her compassionate, culturally inclusive, and client-centered approach. Elsie is passionate about helping clients improve their health and overall quality of life.
On a personal level, Elsie enjoys spending time with her family, traveling, and cooking. As a Caribbean girl, she enjoys warm weather, engaging in outdoor activities such as hiking, riding a bicycle, and playing pickleball with her partner.
Sarah Griffin, MS, RD, CDN, CSP
Sarah Griffin is based in New York as a registered dietitian-nutritionist. She is a graduate of SUNY Oneonta for her undergraduate degree, University of New Haven for her masters program, and Yale New Haven Health for her dietetic internship. She is a certified specialist in pediatrics.
Sarah enjoys working with children and their families and sees patients from birth to college age. When not practicing nutrition, Sarah can be found running, baking, and chasing after her two young children and dog!
Danielle VenHuizen, RDN, CLT
Danielle is a Registered Dietitian and Certified LEAP Therapist residing in Seattle, Washington. Originally completing her undergraduate degree in international studies, she later went back to school when she found her real passion, nutrition. She completed her dietetics master’s degree at Bastyr University and has now been practicing for over 17 years.
While Danielle sees a broad range of clients, her main passions are complex digestive issues, diabetes, heart health and food sensitivities. She also enjoys helping clients work towards anti-inflammatory and Mediterranean style diet patterns customized to their preferences and lifestyle.
In her spare time, Danielle is an avid hiker, backpacker and trail runner. The mom to two teen boys, you can also often find her on the sidelines at track meets cheering them on. Other favorite past times include baking, blogging and meticulously planning her family’s next travel adventure.
Lindsey Sterchi, RDN, CLT
Lindsey is a Montana native who has dedicated over 20 years to
helping individuals improve their health through nutrition. She earned
her undergraduate nutrition degree from Montana State University and
completed an internship at Oregon Health & Science University.
As a Registered Dietitian Nutritionist, Certified Diabetes Care and
Education Specialist, and Certified L.E.A.P. Therapist, Lindsey brings
extensive experience working with a wide range of health conditions.
Her areas of expertise include diabetes, gut health, metabolic health,
weight management, and pre- and post-metabolic surgery.
Lindsey is passionate about empowering her clients to have the
knowledge, tools, and confidence they need to take control of their
health and enhance their quality of life. She takes a holistic
approach to care, focusing not only on symptoms but on the whole
person, and develops personalized plans tailored to each individual’s
unique needs.
Outside of her professional work, Lindsey enjoys spending time with
her husband and two children. She loves gardening, being outdoors,
hiking, and eating delicious food.