Meet the Team
Rebecca Alcosser (she/hers), RD, CDN owner of Tribeca Nutrition
Rebecca Alcosser is an anti-diet Registered Dietitian based in New York City. Rebecca specializes in the treatment of Eating Disorders and performance nutrition for dancers and athletes. Rebecca is currently in the process of obtaining her Certified Eating Disorder Specialist (CEDS) certification through International Association of Eating Disorders Professionals.
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Rebecca’s expertise is treating people with Anorexia Nervosa, Bulimia Nervosa, Binge Eating Disorder, Orthorexia, and ARFID. She has extensive experience treating eating disorders in higher levels of care including partial hospitalization programs and intensive outpatient programming. Rebecca has served as the director of Nutrition programming at mental health and substance abuse treatment centers and is well versed in working with clients with any psychiatric diagnosis not limited to Eating Disorders.
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Rebecca worked as the on campus Dietitian at Barnard college at Columbia University where she provided individual nutrition counseling to students and sat on the Eating Disorder team. As an Eating Disorder team member, Rebecca created protocols and policy to ensure students on campus received appropriate medical, nutrition, and psychiatric care.
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Rebecca currently leads the nutrition department at American Ballet Theatre and the ABT Jacqueline Kennedy Onassis School; a pre-professional ballet training program for students, ages 12-18. Rebecca advises on the wellness team, creates nutrition education programming, and provides one on one screening and nutrition counseling sessions to dancers. Rebecca previously worked with NYC Ballet and School of American Ballet. Rebecca is passionate about providing nutrition support to dancers to help them nourish their bodies to perform their best, prevent injury, and sustain rigorous training schedules.
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Through an all-foods-fit, weight inclusive approach, you will work with Rebecca to explore your relationship with food and your body. In working with Rebecca, you will have a safe, non-judgmental space to explore how food and nutrition impact your overall well being or performance. We look forward to helping you on your journey towards peace with food.
Melissa Mann, MS, RD, CDN
Melissa is a Registered Dietitian specializing in working with clients with eating disorders, disordered eating, body image issues and those who want an anti-diet approach to nutrition. Her career began at The Mount Sinai Hospital in 2016, where she worked as a Clinical Nutrition Coordinator specializing in oncology. Melissa currently works as the lead dietitian at Monte Nido River Towns, a residential eating disorder treatment center in Irvington, NY. Melissa works with her clients to promote healthy, positive relationships with food and body. Melissa's approach to nutrition counseling is centered around an all foods fit philosophy. She truly believes that nourishing your body should be personalized, easy, and enjoyable.
Melissa received a Bachelor of Arts in Psychology with a dual minor in nutrition and human services from the University of Delaware. Melissa went on to obtain a Bachelor of Science in Nutrition and complete her dietetic internship at Long Island University Post. She later earned a Masters of Science in Clinical Nutrition from New York University. Melissa is currently in the process of obtaining her Certified Eating Disorder Specialist (CEDS) certification through International Association of Eating Disorders Professionals.
Sarah Liao, RD
Sarah is a Registered Dietitian nutritionist with a Master of Science in Clinical Nutrition from New York University. Sarah has worked with diverse, underserved communities and is passionate about continuing to provide inclusive, accessible nutrition care. In her work in an eating disorder treatment facility, Sarah supported individuals in their recovery journey through individual and group nutrition support, group meal support, and in planning and execution of meal planning and menu planning.
Sarah believes nutrition should be free of guilt, shame, or rigid rules. Her philosophy is rooted in Health at Every Size (HAES), intuitive eating, and a non-diet approach that respects each person’s lived experience. "Food is deeply personal, shaped by culture, upbringing, and experiences, and I strive to create a space where individuals feel heard, supported, and empowered to build sustainable, healthful habits that align with their unique needs and values. I’d love to get to know you and support you in your recovery journey toward a balanced, nourishing relationship with food free of food rules and judgement. If you think you could benefit from my approach, I would love to connect! ." Sarah Liao.
Christina Chagaris, RD
Christina Chagaris is a Registered Dietitian with a passion for helping individuals develop a positive, sustainable relationship with food. With extensive experience treating eating disorders and disordered eating at the partial hospitalization and intensive outpatient levels of care, she has worked with individuals facing anorexia, bulimia, binge eating disorder, ARFID, orthorexia, OSFED, and co-occurring conditions such as OCD and neurodivergence. Her philosophy is rooted in Intuitive Eating, Health at Every Size (HAES), and a non-diet approach providing clients with compassionate, individualized care that meets them where they are.
Beyond her clinical expertise, Christina brings a unique perspective as a lifelong dancer who previously trained at Joffrey Ballet School, giving her a deep understanding of the nutritional needs and challenges dancers and athletes often face. During her internship at Long Island University Post, she worked with Division I athletes, helping them optimize performance through nutrition while fostering a healthy, balanced mindset around food. Her background allows her to bridge the gap between performance nutrition and eating disorder recovery, offering specialized support for those looking to fuel their bodies without fear.
Christina’s goal is to create a safe and supportive space where clients feel empowered to rebuild trust with food and develop a healthier mindset around nourishment. She believes in a holistic, client-centered approach that considers both physical and emotional well-being.
Outside of her work as a dietitian, Christina enjoys teaching and taking dance class, practicing yoga, hiking, reading and expanding her knowledge in holistic nutrition and sports performance. She is excited to support clients on their journey toward food freedom, balance, and long-term well-being.
Alysse Vocca, RD
Alysse is a Registered Dietitian Nutritionist dedicated to helping individuals heal their relationship with food and their bodies through a compassionate, inclusive, and weight-neutral approach. She holds both a Bachelor’s and Master’s degree in Dietetics from Montclair State University and completed an intensive 11-month dietetic internship at Brigham and Women’s Hospital. During her internship, Alysse completed diverse rotations across inpatient, outpatient, community, and foodservice settings. It was during her specialized inpatient and outpatient pediatric eating disorder rotation that she developed a deep passion for working with individuals struggling with eating disorders—a passion that continues to guide her work today.
Alysse currently works as a Registered Dietitian at The Renfrew Center, a higher level of care for those navigating eating disorders, and also sees clients through Tribeca Nutrition. Her work is grounded in the principles of Health at Every Size® (HAES), intuitive eating, and a non-diet approach. She supports clients in letting go of diet culture, reconnecting with their bodies, and finding sustainable, individualized paths to nourishment and well-being.
Alysse has experience working with neurodivergent individuals, those with co-occurring mental health conditions, and members of the LGBTQ+ community. She is committed to creating a safe, affirming, and supportive environment for every client, meeting them with empathy and respect wherever they are in their journey.
Tribeca Nutrition is Hiring! Looking for Dietitians experienced in Eating Disorder care.
Send Resume & Cover Letter to hello@rebeccaalcosser.com
Services
Initial Nutrition Consultation
Follow up nutrition counseling
Meal support
Drop in nutrition group support
For professionals: group or individual supervision for Dietitians and program consultation for treatment centers: Rebecca offers supervision for Dietitians looking to advance their expertise in the Eating Disorder field. Rebecca offers both group and individual supervision, and provides supervision to groups of Dietitians at various treatment centers. Rebecca can be a resource for treatment centers looking to create policies and procedures related to Eating Disorder care including creating and implementing screening for medical stability, refeeding protocols, meal plans, and group ciriculum.
