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Ryan Warren Mancini, MS, RDN, CDN

Providing expert, evidence-based nutrition counseling to elevate and optimize gut health

About Me

I am a Registered Dietitian and Clinical Nutritionist specializing in gastrointestinal nutrition. I have a Masters of Science in Clinical Nutrition from New York University, completed my Dietetic Internship at New York University (NYU Langone Medical Center) and have a Bachelor of Arts in Human Biology from Brown University. I previously worked for over six years as a dietitian at the Jill Roberts Center for Inflammatory Bowel Disease at Weill Cornell Medicine, where I attained and focused my expertise in providing personalized nutrition counseling to people with a broad range of gastrointestinal issues, notably including Crohn’s Disease, Ulcerative Colitis, Irritable Bowel Syndrome (IBS), Small Intestinal Bacterial Overgrowth (SIBO), diverticulosis/diverticulitis, GERD, food sensitivities and intolerances, and a whole host of other GI conditions. Developed in 2019, my private practice, RWM Nutrition, is solely dedicated to helping clients improve their digestive and overall health via personalized nutrition counseling and dietary management.

About Me


I teach clients how to use food and nutrition to heal their digestive health issues from within! Below are specific areas in which I focus:

Nutrition Counseling

Diet Planning

Lifestyle Support

Clinician Services

Customizing comprehensive nutrition care plans specifically designed to meet digestive health needs and additional goals and preferences

Thoughtfully and creatively developing meal plans, recipe ideas, shopping lists and more!

Empowering clients and providing supportive tools to complement the nutrition program, including expert supplement advice, stress reduction strategies, physical activity programs and much more

Providing educational resources and support for practitioners including online training courses and e-guides

Areas of Expertise

I have extensive experience in delivering patient outcomes across a wide range of gastrointestinal issues, including:

  • Crohn's Disease

  • Ulcerative Colitis

  • Microscopic Colitis, including Lymphocytic Colitis and Collagenous Colitis

  • Irritable Bowel Syndrome

  • Small Intestinal Bacterial Overgrowth (SIBO)

  • Diverticulosis / Diverticulitis

  • GERD

  • Food sensitivities / intolerances

  • Other conditions


"I'm fortunate to experience continuous improvements in my overall wellbeing  and digestive health as a result of Ryan’s nutritional guidance, motivation, and support. Ryan’s assessments and individualized plans over the years have optimized my IBD therapies and that makes a real difference in my every day! Ryan has identified food sensitivities, intolerances, and other conditions, such as SIBO. Her input is empowering because my nutritional decisions are tools that can contribute to a reduction in my symptoms and substantial improvement in digestive health. These successful mitigations have taught me how to manage symptoms when they arise and often shut down the escalation of symptoms using food. I can’t thank Ryan enough for changing my life."

- IBD Client

In the Media

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