Our Dietitians

At F-Factor you’ll work with a registered dietitian who is also certified in F-Factor’s proprietary nutritional method, which is based on more than 20+ years of clinical experience helping clients achieve their health and weight goals.

We don’t just hand our clients a meal plan. We educate them about food and how the body digests, utilizes and stores nutrients so it is easier to focus on eating more of the right kinds of foods. We also spend time listening, which enables us to tailor the F-Factor Diet to their needs, tastes and lifestyle.

Why work with a Registered Dietitian?

Registered Dietitians are food and nutrition experts who apply the science of nutrition into practical solutions for health living, using their clinical expertise to help individuals make personal, positive lifestyle changes.

The “RD” credential may only be used by practitioners who are authorized by the Commission on Dietetic Registration of the American Dietetic Association. Individuals with the RD credential are leaders in the field of dietetics who have fulfilled specific requirements, having earned a least a bachelor’s degree (about half of all RDs hold advanced degrees) in nutrition and food science, completed an accredited, supervised practice program, passed a rigorous national examination and maintain their skills by meeting the profession’s continuing education requirements for re-certification.

While RDs are sometimes referred to as “nutritionists,” not everyone who uses this title is a “registered dietitian.”  In many states anyone may designate themselves a “nutritionist,” regardless of education or training.

Meet the Dietitians

Tanya Zuckerbrot, MS, RD

Tanya Zuckerbrot Founder of The F-Factor Diet

Tanya Zuckerbrot, MS, RD, is a global leader in the health and wellness space. Tanya is the CEO and founder of F-Factor and the creator of the F-Factor diet, which she has used for more than twenty years to provide thousands of clients with all the tools they need to achieve easy weight loss and maintenance and improved health and well-being. F-Factor is the leading dietitian-created program for weight loss and optimal health based upon fiber-rich nutrition that helps people effectively and positively improve their lives without disrupting their lifestyle.

Tanya has appeared on The View, The Today Show, The Early Show, The Rachael Ray Show, MSNBC, ABC News, Good Morning America Health, CBS Evening News, Extra, Good Day New York, and in many other local and national media platforms.

Tanya has been profiled in The New York Times, and has been featured in The New York Post, The New York Daily News, Town & Country, Elle, Vogue, Allure, Self, The Huffington Post, The Miami Herald, The Washington Post and Daily Mail. She is a contributing expert for The Daily Mail and a member of New Beauty Magazine’s Brain Trust.

Tanya is an international speaker and spokesperson. She has lectured for NBC Studios, The Discovery Network, Proctor & Gamble, Johnson & Johnson, G&E and Estee Lauder. Tanya is a Brand Ambassador for the retailer, Saks Fifth Avenue and in 2018, Tanya was selected as one of the New York Business Journal’s Women of Influence honorees.

Tanya holds a Master’s degree in Nutrition and Food Studies from New York University and completed a two-year dietetic internship at NYU Medical Center. She is an accredited member of the American Dietetic Association, the Greater New York Dietetic Association, and a member of the National Association of Professional Women. Tanya completed her CDR Certificate of Training in Adult Weight Management as well as her CDR Certificate of Training in Childhood and Adolescent Weight Management. Tanya is a Medical Advisory Board Member of Sharsheret.

Tanya is the author of two bestselling weight loss books: The F-Factor Diet: Discover the Secret to Permanent Weight Loss (2006, TarcherPerigee), and The Miracle Carb Diet: Make Calories and Fat Disappear the F-Factor Way – with Fiber! (2012, Hachette Books).

Tanya resides in New York City with her husband and their children.

Maria Stavropoulos, MS, RD, CDN

Maria Stavropoulos Registered Dietitian at F-Factor

Maria Stavropoulos, MS, RD, CDN, is a Registered Dietitian and New York Certified Dietitian-Nutritionist at F-Factor Nutrition where she provides nutrition counseling for weight loss and management and medical nutrition therapy for chronic conditions such as diabetes, hyperlipidemia, hypertension, polycystic ovary syndrome (PCOS) and gastrointestinal disorders. Through her expertise, she provides clients with individualized care and support while educating them on proper nutrition with a focus on sustainable dietary and lifestyle changes that enhance their quality of life.

Growing up in a Greek-American family, with authentic dishes at the center of every gathering, Maria gained an interest in nutrition. As an active teen, she learned the importance and positive impact healthy and balanced food choices have on one’s health.

Maria holds a Bachelor of Science in Nutrition with a minor in Media Studies and a Master of Science in Nutrition from the Hunter College School of Public Health. She completed a comprehensive dietetic internship residency through Aramark Healthcare Corporation where she gained extensive experience in both clinical and community nutrition as well as management at Bronx Lebanon Hospital Center and Richmond University Medical Center. Maria is an active member of the Academy of Nutrition and Dietetics and Greater New York Dietetic Association.

Maria has conducted nutrition education and wellness lectures to corporate and community organizations across the United States. Prior to her clinical work, Maria worked as an Audience Producer at various television shows within ABC Television Network, where she assisted in the production of daily episodes. Maria’s interest and engagement in media opportunities has allowed her to implement nutrition education on larger platforms.

Maria’s passion for nutrition and food extends to some of her favorite activities, which include cooking authentic Greek dishes with her mother, coaching a youth volleyball team in Bergen County, exploring the New York City dining scene with family and friends, traveling, and sharing her nutrition and wellness knowledge with others on social media.

Samantha Lee Hass, RD, CDN

Samantha Lee Hass Registered Dietitian at F-Factor

Samantha Lee Hass, RD, CDN is a registered dietitian at F-Factor, where she provides individualized nutrition counseling for weight loss and medical nutrition therapy for chronic conditions such as diabetes, high cholesterol, thyroid and GI disorders. She also specializes in prenatal and postpartum nutrition.

While in high school in Miami, Samantha was diagnosed with Hashimoto’s disease, an autoimmune thyroid disorder, which is infamous for its effect on weight gain and inability to lose weight. In just a few months, Samantha had gained 15 pounds. She turned to exercise in hopes of losing the excess pounds, but was unable to lose the weight until she changed what was on her dinner plate. Following a high-fiber, high protein diet, in line with the F-Factor philosophy, she was able to get back to her previous healthy weight.

Samantha attended New York University where she received her Bachelors in Nutrition and Dietetics and a minor in Psychology. She completed a 12-month clinical dietetic internship at New York-Presbyterian and was selected for their Nutrition Fellow program where she specialized in nutrition for pediatrics and obstetrics. Samantha is an active member of the Academy of Nutrition and Dietetics and several practice groups such as Pediatric Nutrition, Dietitians in Integrative and Functional Medicine and Nutrition Entrepreneurs.

During her free time, Samantha enjoys spending time with her son, Levi, and husband, Andre. Samantha loves to dine out, play tennis, and travel. Samantha wants to spread her knowledge of how to balance being a parent, a wife, a daughter, having a career and following a healthy lifestyle.

Julia Tishman, MS, RD, CDN

Julia Tishman, MS, RD, CDN, is a registered dietitian at F-Factor Nutrition where she sees clients for weight loss and medical nutrition therapy for chronic conditions such as diabetes, hypertension and hyperlipidemia. She also specializes in fertility, gestational diabetes, prenatal, postpartum and pediatrics.

Julia was born and raised in New York City, so is no stranger to the crazy, fast paced lifestyle here. She found her path to nutrition in a less conventional way than our other RD’s; starting out by graduating undergrad with a BS in Art History from John Hopkins. A few years into her first job, she began to feel unhappy in the environment and had gained weight due to stress and an unhealthy, unbalanced lifestyle. During this time she discovered cooking was the perfect stress outlet; the more she cooked, she realized how important nutrition was, and the role it played in her life. This realization led her to make a career change and move from a career in art to her passion for nutrition.

She attended New York University and obtained her Masters in Clinical Nutrition. She completed a year-long comprehensive dietetic residency through NYU’s dietetic internship, completing rotations at New York Presbyterian-Brooklyn Methodist Hospital, Bubble and NYU. In addition to her clinical work, Julia is an active member of the Academy of Nutrition and Dietetics. She is also a member of several practice groups including, Weight Management, Women’s Health, Pediatric Nutrition, and Dietitians in Integrative and Functional Medicine.

In her free time, Julia loves spending time with her husband and son, Spencer. She still enjoys cooking, trying new restaurants (both in NYC and around the world) and traveling!

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