Meet Our Registered Dietitians in New York ny
REBECCA ALCOSSER
(she/hers), RD, CDN, CEDS
Founder of Tribeca Nutrition | Registered Dietitian & Certified Eating Disorder Specialist
Rebecca is an anti-diet Registered Dietitian based in New York City, specializing in eating disorder recovery, intuitive eating, and performance nutrition for dancers and athletes.
As a Certified Eating Disorder Specialist (CEDS), Rebecca combines extensive clinical experience with a compassionate, weight-inclusive approach. She helps clients move away from food rules, reduce anxiety around eating, and build a more peaceful, sustainable relationship with food.
Rebecca has experience treating anorexia nervosa, bulimia nervosa, binge eating disorder, orthorexia, and avoidant/restrictive food intake disorder (ARFID). Her background includes working in partial hospitalization and intensive outpatient treatment programs, as well as leading nutrition programming in mental health and substance use treatment settings.
Previously, Rebecca served as the on-campus Dietitian at Barnard College of Columbia University, providing individual nutrition counseling and helping develop eating disorder care protocols. She currently leads the nutrition department at the American Ballet Theatre Jacqueline Kennedy Onassis School, supporting dancers with performance nutrition, injury prevention, and sustainable fueling strategies.
What It's Like to Work With Rebecca
Rebecca believes nutrition counseling should feel supportive, collaborative, and free from judgment. Together, you'll work toward:
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Developing a more peaceful relationship with food and your body.
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Moving away from restriction, guilt, and rigid food rules.
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Building confidence around eating and nourishing your body adequately.
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Reducing food anxiety and reconnecting with hunger and fullness cues.
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Supporting energy, strength, and recovery without compromising your relationship with food.
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Creating realistic, sustainable strategies that fit your individual needs.
Whether you're navigating eating disorder recovery, struggling with food anxiety, or looking to support athletic performance, Rebecca offers individualized care that considers your physical health, emotional well-being, and personal goals.
And if you visit the Tribeca office, you might even meet Rebecca's sweet pup, Ember (pictured), who's always happy to provide a little extra comfort!
347-722-1340
Christina Chagaris (she/hers), RD
Registered Dietitian | Eating Disorders, Intuitive Eating & Performance Nutrition
Christina is a registered dietitian specializing in eating disorder recovery, disordered eating, intuitive eating, and nutrition for dancers and athletes. With experience treating eating disorders at both the partial hospitalization and intensive outpatient levels of care, she brings a compassionate, weight-inclusive approach to nutrition counseling.
A lifelong dancer who trained at the Joffrey Ballet School, Christina understands the unique relationship between food, body image, and performance. She helps clients move away from rigid food rules, rebuild trust with their bodies, and find a sustainable approach to nourishment that supports both recovery and performance.
347-722-1340
Sarah liao
(she/hers), MS, RD
Registered Dietitian | Eating Disorder Recovery & Intuitive Eating
Sarah is a registered dietitian with a Master of Science in Clinical Nutrition from New York University, specializing in eating disorder recovery, intuitive eating, and weight-inclusive nutrition counseling.
With experience in eating disorder treatment settings, Sarah brings a compassionate, collaborative approach to helping clients navigate food anxiety, body image concerns, and restrictive eating patterns. Her work is grounded in Health at Every Size (HAES) and anti-diet principles, emphasizing flexibility, self-trust, and sustainable nourishment.
Sarah is especially passionate about creating an inclusive, culturally sensitive environment where clients feel heard, respected, and empowered to build a more peaceful relationship with food.
347-722-1340