Digestive Health

Yuying Luo, MD, is an assistant professor of medicine at Mount Sinai West and Morningside in New York City. She aims to deliver evidence-based, patient-centered, and holistic care for her patients.

Her clinical and research focus includes patients with disorders of gut-brain interaction such as irritable bowel syndrome and functional dyspepsia; patients with lower gastrointestinal motility (constipation) disorders and defecatory and anorectal disorders (such as dyssynergic defecation); and women’s gastrointestinal health.

She graduated from Harvard with a bachelor's degree in molecular and cellular biology and received her MD from the NYU Grossman School of Medicine. She completed her residency in internal medicine at the Icahn School of Medicine at Mount Sinai, where she was also chief resident. She completed her gastroenterology fellowship at Mount Sinai Hospital and was also chief fellow.

Ira Daniel Breite, MD, is a board-certified internist and gastroenterologist. He is an associate professor at the Icahn School of Medicine at Mount Sinai, where he also sees patients and helps run an ambulatory surgery center.

Dr. Breite divides his time between technical procedures, reading about new topics, and helping patients with some of their most intimate problems. He finds the deepest fulfillment in the long-term relationships he develops and is thrilled when a patient with irritable bowel syndrome or inflammatory bowel disease improves on the regimen he worked with them to create.

Breite went to Albert Einstein College of Medicine for medical school, followed by a residency at NYU and Bellevue Hospital and a gastroenterology fellowship at Memorial Sloan Kettering Cancer Center. Working in city hospitals helped him become resourceful and taught him how to interact with people from different backgrounds.

Justin Laube, MD, is a board-certified integrative and internal medicine physician, a teacher, and a consultant with extensive expertise in integrative health, medical education, and trauma healing.

He graduated with a bachelor's in biology from the University of Wisconsin and a medical degree from the University of Minnesota Medical School. During medical school, he completed a graduate certificate in integrative therapies and healing practices through the Earl E. Bakken Center for Spirituality & Healing. He completed his three-year residency training in internal medicine at the University of California in Los Angeles on the primary care track and a two-year fellowship in integrative East-West primary care at the UCLA Health Center for East-West Medicine.

He is currently taking a multiyear personal and professional sabbatical to explore the relationship between childhood trauma, disease, and the processes of healing. He is developing a clinical practice for patients with complex trauma, as well as for others going through significant life transitions. He is working on a book distilling the insights from his sabbatical, teaching, and leading retreats on trauma, integrative health, mindfulness, and well-being for health professionals, students, and the community.

Previously, Dr. Laube was an assistant clinical professor at the UCLA Health Center for East-West Medicine and the David Geffen School of Medicine at UCLA, where he provided primary care and integrative East-West medical consultations. As part of the faculty, he completed a medical education fellowship and received a certificate in innovation in curriculum design and evaluation. He was the fellowship director at the Center for East-West Medicine and led courses for physician fellows, residents, and medical students.

A graduate of the Indiana University School of Medicine, Meeta Shah, MD, is a board-certified emergency medicine physician with 10 years of clinical experience. She has been on staff at community and academic based emergency departments during this time, and has been involved in both the clinical and educational aspects of emergency medicine. She is a member of the American College of Emergency Physicians and the American Medical Writers Association. She serves on a board review committee for the Illinois College of Emergency Physicians and participates yearly in their written and oral boards review courses, helping new EM physicians pass their exams. She is the founder of Mesh Medical Writing LLC. She writes on and reviews a wide range of medical topics.

Kara Andrew, RDN, LDN, is the director of health promotion for Memorial Hospital in Carthage, Illinois. She is also licensed as an exercise physiologist and certified in lifestyle medicine by the American College of Lifestyle Medicine. Her experience includes corporate wellness, teaching for the American College of Sports Medicine, sports nutrition, weight management, integrative medicine, oncology support, and dialysis.

She earned her master's in exercise and nutrition science at Lipscomb University.

Andrew has served as a president and board member of the Nashville Academy of Nutrition and Dietetics. She was recently elected a co-chair of the fitness and medicine group in the American College of Lifestyle Medicine.

Allison Buttarazzi, MD, is board-certified in internal medicine and lifestyle medicine, and is a certified health and well-being coach. In her primary care practice, Dr. Buttarazzi focuses on lifestyle medicine to help her patients improve their health and longevity, and her passion is helping patients prevent and reverse chronic diseases (like heart disease, high blood pressure, and diabetes) by improving their lifestyle habits.

She is a graduate of Tufts University School of Medicine and completed a residency at Maine Medical Center. Diagnosed with celiac disease during medical school, she realized the power of improving one's health through diet and lifestyle habits, which she later incorporated into her practice.

Lynn Grieger is a registered dietitian-nutritionist, certified diabetes care and education specialist, certified personal trainer, and certified health and wellness coach. She completed requirements to become a registered dietitian at Valparaiso University in 1987 and completed a dietetic internship at Ingalls Memorial Hospital in Harvey, Illinois, in 1988. 

Lynn brings her expertise in nutrition, exercise, and behavior change to her work in helping people reach their individual health and fitness goals. In addition to writing for Everyday Health, she has also written for websites and publications like Food and Health Communications, Today's Dietitian, iVillage.com, and Rodale Press. She has a passion for healthy, nutrient-dense, great-tasting food and for being outdoors as much as possible — she can often be found running or hiking, and has completed a marathon in every state.

Jane Yoon Scott, MD, is an infectious disease physician and an assistant professor of medicine at Emory University in Atlanta. Dr. Scott enjoys connecting with her patients, empowering them to understand and take ownership of their health, and encouraging them to ask questions so that they can make informed and thoughtful decisions.

She graduated with the highest honors from the Georgia Institute of Technology, then received her MD from the Medical College of Georgia. She completed her internal medicine residency training and chief residency at Temple University Hospital, as well as a fellowship in infectious diseases at Emory University. She is board-certified in both internal medicine and infectious diseases.

When she is not seeing patients, Dr. Scott works with neighboring health departments to promote public health, especially to communities that have been historically underserved. She also teaches medical trainees and lectures medical students at the Emory University School of Medicine.

In her free time, Dr. Scott appreciates a good coffee shop, weekend hikes, playing guitar, strolling through cities, sampling restaurants, and traveling to new places.

Waseem Ahmed, MD, is an assistant professor of medicine in the Karsh Division of Gastroenterology and Hepatology at Cedars-Sinai Medical Center in Los Angeles and serves as Director, Advanced Inflammatory Bowel Disease Fellowship and Education within the F. Widjaja Inflammatory Bowel Disease Institute.

He received his undergraduate degree from the University of Michigan and attended medical school at Indiana University. He then completed an internal medicine residency at New York University, followed by a fellowship in gastroenterology and hepatology at Indiana University, and an advanced fellowship in inflammatory bowel disease at the Jill Roberts Center for Inflammatory Bowel Disease at New York-Presbyterian Hospital/Weill Cornell Medicine. Prior to his current role, Dr. Ahmed served as an assistant professor of medicine within the Crohn’s and Colitis Center at the University of Colorado from 2021-2024.

Dr. Ahmed is passionate about providing innovative, comprehensive, and compassionate care for all patients with inflammatory bowel disease (IBD). His research interests include IBD medical education for patients, providers, and trainees; clinical trials; acute severe ulcerative colitis; and the use of combined advanced targeted therapy in high-risk IBD.

He enjoys spending time with his wife and dog, is an avid follower of professional tennis, and enjoys fine dining.

Jennifer Payne, MD, is a physician at Penn Medicine Lancaster General Health.

She earned her bachelor's from the University of St. Thomas, majoring in biochemistry and minoring in theology. She was the first service learning assistant for the service learning program and did extensive volunteer work with Open Arms of Minnesota during this time, including building a library on multiple sclerosis information. She obtained her MD from the Georgetown University School of Medicine, where she was part of the first class to run the Hoya Clinic for people without housing. She also completed an elective in medical writing and editing, working with American Family Physician magazine. Dr. Payne completed her residency in family medicine at Lancaster General Hospital and a primary care sports medicine fellowship at Wellspan Health in York, Pennsylvania. 

She has served on the board of the Mid-Atlantic Regional Chapter of the American College of Sports Medicine and assisted in obtaining speakers and clinical case studies for the physician portion of the conference.

She enjoys reading, all sports (particularly Olympic weightlifting), walking her dog, and spending time with her husband, sons, and their extended family.

Eugene Lucas, MD, is a board-certified obesity medicine specialist at the Weill Cornell Medicine Comprehensive Weight Control Center. He provides comprehensive care to help his patients increase both their healthspan and their lifespan.

Dr. Lucas also acts as an assistant medical director of clinical information services for NewYork-Presbyterian Hospital Enterprise. He is focused on improving electronic interfaces used by both patients and clinical providers to enhance clinical care.

Lucas lives in New York City and enjoys skiing, tennis, strength and aerobic training, live music, sauna use on a semi-regular basis, and spending time outdoors with his dog, Gracie.

Jennifer K. Frediani, PhD, RD, ACSM-CES, is a nutrition scientist, exercise physiologist, and registered dietitian with over two decades of experience in clinical research, education, and lifestyle intervention. She's an assistant professor, research track, at the Nell Hodgson Woodruff School of Nursing at Emory University, adjunct faculty in the nutrition and health sciences program at the Rollins School of Public Health, and a member of the Winship Cancer Institute.

Dr. Frediani earned her PhD in nutrition science from Emory University, and a master’s in exercise science and a bachelor’s in nutrition and dietetics from Georgia State University. Her doctoral research focused on body composition and dietary assessment among tuberculosis patients in the Republic of Georgia, and her postdoctoral work explored nutritional influences on pediatric liver disease.

She has published widely in journals such as Nature Scientific Reports, The New England Journal of Medicine, Clinical Nutrition, and Progress in Cardiovascular Diseases.

At Emory, she directs adult clinical studies for the NIH RADx initiative, overseeing trials on novel diagnostics for infectious diseases. She also leads the development of Emory’s fully online master of science in clinical nutrition program, designed to prepare future registered dietitian nutritionists through integrated coursework and supervised experiential learning.

Her research focuses on weight-neutral lifestyle interventions to improve cardiometabolic outcomes, with a special emphasis on dietary assessment, physical activity, and metabolomics.

Frediani’s teaching philosophy centers on creating inclusive, student-driven learning environments that foster critical thinking and professional growth. She is passionate about reducing weight stigma in clinical care and promoting sustainable, individualized approaches to food and movement.

Outside of work, Frediani is an avid runner and food enthusiast who travels the world to explore culinary traditions and cultural foodways. She believes that everyone deserves to enjoy food that nourishes both body and soul — without shame or restriction.

Kelly Kennedy is a licensed dietitian-nutritionist with over 14 years of experience in digital media. She previously managed and oversaw nutrition content, recipe development, meal planning, and diet and nutrition coaching at Everyday Health. She developed and reviewed various meal plans, books, slideshows, and online tools, and oversaw the creation of more than 500 unique recipes. She received her bachelor's degree from the University of Massachusetts, Amherst, and a master's degree from the State University of New York College at Oneonta.

Kennedy enjoys anything that takes her outside, from gardening and playing in the yard with her kids to hiking and even feeding her pet chickens.

Lindsey Marcellin, MD, MPH is an internal medicine specialist with extensive clinical experience in multiple practice settings. Dr. Marcellin is a past medical director of both fee-for-service and community free clinics. She is a director and medical team leader for Solar Light for Africa, Ltd., a non-profit group providing solar energy systems to health care facilities in Africa, and has led three medical assistance teams to Uganda. She graduated from Eastern Virginia Medical School, and completed post-graduate training at Georgetown University. She has a master's degree in public health from Johns Hopkins Bloomberg School of Public Health, with a concentration in infectious diseases and international health. She writes on and reviews a wide range of medical and public health issues.

Grant Chu, MD, is an assistant clinical professor at the David Geffen School of Medicine at UCLA. Dr. Chu is also the associate director of education at the UCLA Center for East-West Medicine, using technology to further medical education.

He is board-certified in internal medicine by the American Board of Internal Medicine and is a diplomate of the National Certification Commission for Acupuncture and Oriental Medicine.

He received a bachelor's degree in neuroscience from Brown University, where he also earned his medical degree. He has a master's in acupuncture and oriental medicine from South Baylo University and a master's in business administration from the University of Illinois. He completed his residency in internal medicine at the University of California in Los Angeles and a fellowship at the Center for East-West Medicine at UCLA.

He has held academic appointments at the University of California in Irvine and the University of Queensland in Australia.

Reyna Franco, RDN, is a New York City–based dietitian-nutritionist, certified specialist in sports dietetics, and certified personal trainer. She is a diplomate of the American College of Lifestyle Medicine and has a master's degree in nutrition and exercise physiology from Columbia University.

In her private practice, she provides medical nutrition therapy for weight management, sports nutrition, diabetes, cardiac disease, renal disease, gastrointestinal disorders, cancer, food allergies, eating disorders, and childhood nutrition. To serve her diverse patients, she demonstrates cultural sensitivity and knowledge of customary food practices. She applies the tenets of lifestyle medicine to reduce the risk of chronic disease and improve health outcomes for her patients.

Franco is also a corporate wellness consultant who conducts wellness counseling and seminars for organizations of every size. She taught sports nutrition to medical students at the Albert Einstein College of Medicine, taught life cycle nutrition and nutrition counseling to undergraduate students at LaGuardia Community College, and precepts nutrition students and interns. She created the sports nutrition rotation for the New York Distance Dietetic Internship program.

She is the chair of the American College of Lifestyle Medicine's Registered Dietitian-Nutritionist Member Interest Group. She is also the treasurer and secretary of the New York State Academy of Nutrition and Dietetics, having previously served in many other leadership roles for the organization, including as past president, awards committee chair, and grant committee chair, among others. She is active in the local Greater New York Dietetic Association and Long Island Academy of Nutrition and Dietetics, too.

Natalia Johnsen, MD, practices internal medicine and lifestyle medicine. She works as an internist for the Vancouver Clinic in Vancouver, Washington.

Johnsen trained and worked as ob-gyn in Russia before coming to the United States in 2000. Subsequently, she interned in internal medicine at the University of Nevada and completed her residency at a Stanford-affiliated program in Santa Clara, California. After that she worked as a general internist for two years before to switching to full-time hospital work.

Johnsen has always been fascinated by the effects that lifestyle can have on physical and mental health, and she fell in love with the concept of lifestyle medicine as a specialty after seeing patients struggle with issues that could have been prevented had they known more about a healthy lifestyle. To make an impact on her patients through lifestyle interventions, she launched her own lifestyle medicine clinic, Vivalso Health and Longevity.

Julie Cunningham has been a registered dietitian for more than 25 years. She is a certified diabetes care and education specialist (CDCES) and an international board-certified lactation consultant. She has served as the president of the Foothills Chapter of the North Carolina Dietetics Association (NCDA) and has been a member of the executive board of the NCDA.

Ms. Cunningham received a bachelor's degree from Appalachian State University in North Carolina. She subsequently completed a master's degree in public health nutrition at the University of North Carolina at Chapel Hill.

Ms. Cunningham has worked in women's and children's health, cardiology, and diabetes. She is the author of 30 Days to Tame Type 2 Diabetes, and she has also written for Abbott Nutrition News, Edgepark Medical Health Insights, diaTribe, Babylist, and others.

A resident of beautiful western North Carolina, Cunningham is an avid reader who enjoys yoga, travel, and all things chocolate.

Jill Corleone is a registered dietitian and health coach who has been writing and lecturing on diet and health for more than 15 years. Her work has been featured on the Huffington Post, Diabetes Self-Management and in the book "Noninvasive Mechanical Ventilation," edited by John R. Bach, M.D. Corleone holds a Bachelor of Science in nutrition.

Michelle Seguin, MD, is a board-certified family medicine, lifestyle medicine, and certified functional medicine physician (IFMCP). She is a practicing physician at Root Functional Medicine, a leading telemedicine practice specializing in personalized, root-cause care.

Lauren is a Registered Dietitian with over 6 years of experience in the field. She has experience in food service management, nutrition counseling, and WIC. Lauren graduated from Western Michigan University and completed her dietetic internship at Michigan State University. You can see her writing work at www.laurenarmstrongrdn.com

Kayli Anderson has over a decade of experience in nutrition, culinary education, and lifestyle medicine. She believes that eating well should be simple, pleasurable, and sustainable. Anderson has worked with clients from all walks of life, but she currently specializes in nutrition therapy and lifestyle medicine for women. She’s the founder of PlantBasedMavens.com, a hub for women to get evidence-based, practical, and woman-centered guidance on nutrition and cooking, hormone health, fertility, pregnancy, movement, mental well-being, nontoxic living, and more.

Anderson is board-certified in lifestyle medicine and serves as lead faculty of the American College of Lifestyle Medicine’s (ACLM) "Food as Medicine" course. She is past chair of the ACLM's registered dietitian member interest group, secretary of the women's health member interest group, and nutrition faculty for many of ACLM's other course offerings. She is the coauthor of the Plant-Based Nutrition Quick Start Guide and works with many of the leading organizations in nutrition and lifestyle medicine to develop nutrition content, recipes, and educational programs.

Anderson frequently speaks on the topics of women’s health and plant-based nutrition and has coauthored two lifestyle medicine textbooks, including the first one on women’s health, Improving Women's Health Across the Lifespan.

She received a master's degree in nutrition and physical performance and is certified as an exercise physiologist and intuitive eating counselor. She's a student of herbal medicine and women's integrative and functional medicine. She lives with her husband in the Colorado Rocky Mountains, where you’ll find her out on a trail or in her garden.