Irritable Bowel Syndrome (IBS) Nutritionists and Dietitians in Sag Harbor, NY

Photo of Molly Ostrander - Molly Ostrander | Women's Gut & Hormone Health, Nutritionist/Dietitian, MS, RDN LDN, IFNCP
Molly Ostrander | Women's Gut & Hormone Health
Nutritionist/Dietitian, MS, RDN LDN, IFNCP
Online Only
IBS patterns shift.
I practice integrative, functional nutrition focused on identifying root causes. We assess digestion, hormones, stress, and the big picture of your health history to understand what’s driving your symptoms. You’ll follow a structured plan with clear priorities, optional lab testing, and practical support. Care is available 1:1 or in small groups.
IBS patterns shift.
I practice integrative, functional nutrition focused on identifying root causes. We assess digestion, hormones, stress, and the big picture of your health history to understand what’s driving your symptoms. You’ll follow a structured plan with clear priorities, optional lab testing, and practical support. Care is available 1:1 or in small groups.
(718) 550-3694 View (718) 550-3694

More Dietitians and Nutritionists Nearby

Photo of Ann Silver, Nutritionist/Dietitian, MS, RDN, CDCES, CDN
Ann Silver
Nutritionist/Dietitian, MS, RDN, CDCES, CDN
East Hampton, NY 11937
Meeting with Ann Silver to address your nutritional issues and goals involves allowing Ann a window into your life. Changing one's eating style or food choices is not only about selecting different foods but looking at all aspects of your life that impacts your eating. The questions that need to be explored are why do you eat, when do you eat, where do you eat, how do you eat, what do you eat and how much do you eat.
Meeting with Ann Silver to address your nutritional issues and goals involves allowing Ann a window into your life. Changing one's eating style or food choices is not only about selecting different foods but looking at all aspects of your life that impacts your eating. The questions that need to be explored are why do you eat, when do you eat, where do you eat, how do you eat, what do you eat and how much do you eat.
(631) 284-4815 View (631) 284-4815
Photo of Jennifer Clemente, Nutritionist/Dietitian, MS, CNS, CDN, IFMCP
Jennifer Clemente
Nutritionist/Dietitian, MS, CNS, CDN, IFMCP
Online Only
My philosophy centers on one simple, powerful truth: the gut is the foundation of health. You’re not alone if you feel trapped by symptoms yet routine labs were normal. Or you’ve been given medication, acid blockers, antidepressants or vague advice like “try eating better” without anyone asking why you have symptoms in the first place. I’ve been there too and I know a better way. My approach focuses on finding the root cause of your health concerns through deeper testing to answer key questions: What’s driving the inflammation? Is the gut lining compromised? Is the microbiome balanced? Is the body absorbing nutrients properly?
My philosophy centers on one simple, powerful truth: the gut is the foundation of health. You’re not alone if you feel trapped by symptoms yet routine labs were normal. Or you’ve been given medication, acid blockers, antidepressants or vague advice like “try eating better” without anyone asking why you have symptoms in the first place. I’ve been there too and I know a better way. My approach focuses on finding the root cause of your health concerns through deeper testing to answer key questions: What’s driving the inflammation? Is the gut lining compromised? Is the microbiome balanced? Is the body absorbing nutrients properly?
(646) 679-7940 View (646) 679-7940
Photo of Deborah A. Williams, Nutritionist/Dietitian, RD, CDN
Deborah A. Williams
Nutritionist/Dietitian, RD, CDN
Online Only
As a Registered Dietitian (RD, CDN), I help clients move beyond diets, confusion, and quick fixes into a sustainable, empowered relationship with food and body. My approach blends evidence-based nutrition with holistic practices rooted in neuroscience, mindset, and embodiment. Together, we uncover patterns that keep you stuck, calm the inner voice of doubt, and build trust in your body’s signals. Clients often arrive frustrated or disconnected; I guide them toward food freedom, body acceptance, and a clear, confident path to lasting wellness.
As a Registered Dietitian (RD, CDN), I help clients move beyond diets, confusion, and quick fixes into a sustainable, empowered relationship with food and body. My approach blends evidence-based nutrition with holistic practices rooted in neuroscience, mindset, and embodiment. Together, we uncover patterns that keep you stuck, calm the inner voice of doubt, and build trust in your body’s signals. Clients often arrive frustrated or disconnected; I guide them toward food freedom, body acceptance, and a clear, confident path to lasting wellness.
(631) 502-7972 View (631) 502-7972
Photo of Barbara Ann Grova, Nutritionist/Dietitian, INHC, AADP
Barbara Ann Grova
Nutritionist/Dietitian, INHC, AADP
Manorville, NY 11949
I have over 20 years experience in womens hormonal health, weight loss, anxiety and nutrition. I am a 9 year Breast Cancer survivor, treating my stage 2 holistically. I help Survivors recover and prevent reoccurrence. Together we uncover the root cause of your health condition. I will give you a nutrition and lifestyle protocol so your body can heal naturally without medication. I teach you my life’s challenges coping skills. My clients lose an average of 12-15 lbs on my on-line program. I love and support you through every step, holding your hand until you’re ready to flourish on your own! I am very caring, dedicated, compassionate
I have over 20 years experience in womens hormonal health, weight loss, anxiety and nutrition. I am a 9 year Breast Cancer survivor, treating my stage 2 holistically. I help Survivors recover and prevent reoccurrence. Together we uncover the root cause of your health condition. I will give you a nutrition and lifestyle protocol so your body can heal naturally without medication. I teach you my life’s challenges coping skills. My clients lose an average of 12-15 lbs on my on-line program. I love and support you through every step, holding your hand until you’re ready to flourish on your own! I am very caring, dedicated, compassionate
(516) 530-7955 View (516) 530-7955
Photo of Sara Ryba Matty, Nutritionist/Dietitian, RD, CDN
Sara Ryba Matty
Nutritionist/Dietitian, RD, CDN
1 Endorsed
Serves Area
My ideal client is an individual that wants to partner with me to set goals and accomplish them together! Whether you want eat healthier, lose weight, tackle a medical issue or a combination of all of them, my job is to put my client at ease and guide them to success. I value the relationships and bonds that are create between me and my clients. Food is a very intimate, cultural, personal issue; and in many ways ends up encompassing almost areas of lives. I thrive off of the trust that my clients and I build together and our ultimate victories, both large and small.
My ideal client is an individual that wants to partner with me to set goals and accomplish them together! Whether you want eat healthier, lose weight, tackle a medical issue or a combination of all of them, my job is to put my client at ease and guide them to success. I value the relationships and bonds that are create between me and my clients. Food is a very intimate, cultural, personal issue; and in many ways ends up encompassing almost areas of lives. I thrive off of the trust that my clients and I build together and our ultimate victories, both large and small.
(516) 588-7297 View (516) 588-7297

Online Dietitians and Nutritionists

Photo of Karissa Stevens, Nutritionist/Dietitian, RDN, CDN
Karissa Stevens
Nutritionist/Dietitian, RDN, CDN
Online Only
Karissa has extensive experience working in the outpatient setting with clients experiencing a wide range of concerns including disordered eating, emotional eating, management of chronic diseases (ie: diabetes, heart disease, kidney disease, auto-immune conditions), PCOS, IBS/GI issues, and more.
Karissa prioritizes a compassionate, non-judgmental approach around nutrition counseling. She understands change is difficult, especially when it comes to something as personal as your relationship with food. Her goal is to build a safe space to explore the physical, mental, and emotional impact of nutrition as it fits into your life.
Karissa has extensive experience working in the outpatient setting with clients experiencing a wide range of concerns including disordered eating, emotional eating, management of chronic diseases (ie: diabetes, heart disease, kidney disease, auto-immune conditions), PCOS, IBS/GI issues, and more.
Karissa prioritizes a compassionate, non-judgmental approach around nutrition counseling. She understands change is difficult, especially when it comes to something as personal as your relationship with food. Her goal is to build a safe space to explore the physical, mental, and emotional impact of nutrition as it fits into your life.
(646) 846-9610 View (646) 846-9610
Photo of Robin Decicco, Nutritionist/Dietitian, CHHC
Robin Decicco
Nutritionist/Dietitian, CHHC
Online Only
I am an expert in the areas of weight loss, label reading, gluten-free and other food allergies and teaching mindfulness related to eating patterns.I create meal and lifestyle plans to reduce symptoms of inflammatory conditions, gastrointestinal and neurological disorders, forms of cancer, diabetes and cardiovascular disease. My program empowers individuals, families and groups to make smarter, more informed food decisions, leading to health, balance and longevity. I promote overall health through assisting clients and making informed food decisions by combining the most recent scientific findings with specific interventions that lead to health and balance.
I am an expert in the areas of weight loss, label reading, gluten-free and other food allergies and teaching mindfulness related to eating patterns.I create meal and lifestyle plans to reduce symptoms of inflammatory conditions, gastrointestinal and neurological disorders, forms of cancer, diabetes and cardiovascular disease. My program empowers individuals, families and groups to make smarter, more informed food decisions, leading to health, balance and longevity. I promote overall health through assisting clients and making informed food decisions by combining the most recent scientific findings with specific interventions that lead to health and balance.
(201) 289-5984 View (201) 289-5984
Photo of Megan Fahey, Nutritionist/Dietitian, MS, RD, IFNCP
Megan Fahey
Nutritionist/Dietitian, MS, RD, IFNCP
Scarsdale, NY 10583
Hello! I’m Megan Fahey, MS, RD, IFNCP, RYT 200 a Registered Dietitian, Functional Medicine Nutritionist and Registered Yoga Teacher. My private practice, located between Palm Beach & NY, was founded to help women heal their relationships with food and free patterns of disordered eating. My nutrition sessions artfully blend eastern and western healing modalities. I believe that every person deserves to transform their relationship with food into the fullest expression of self-care. As a frequent traveler, avid reader, and amateur chef, I have an endless curiosity about the intersection between nature and culture.
Hello! I’m Megan Fahey, MS, RD, IFNCP, RYT 200 a Registered Dietitian, Functional Medicine Nutritionist and Registered Yoga Teacher. My private practice, located between Palm Beach & NY, was founded to help women heal their relationships with food and free patterns of disordered eating. My nutrition sessions artfully blend eastern and western healing modalities. I believe that every person deserves to transform their relationship with food into the fullest expression of self-care. As a frequent traveler, avid reader, and amateur chef, I have an endless curiosity about the intersection between nature and culture.
(561) 349-4674 View (561) 349-4674
Photo of Lana Zinger, Nutritionist/Dietitian, EdD, RD, CHES
Lana Zinger
Nutritionist/Dietitian, EdD, RD, CHES
Whitestone, NY 11357
Dr. Lana Zinger is a Professor of Nutrition, Public Health and Health Coaching. She is a well known author of many textbooks and peer reviewed research articles as well as a national speaker on health and nutrition. She holds a B.S. in Nutrition from NYU, a M.S in Nutrition and Physiology from Columbia University and a Doctorate in Health and Behavior Studies from Columbia University. She is a Registered Dietitian with many years of clinical experience including obesity, diabetes, cancer, heart disease, eating disorders. She is a Certified LEAP therapist to TEST and treat food intolerances.
Dr. Lana Zinger is a Professor of Nutrition, Public Health and Health Coaching. She is a well known author of many textbooks and peer reviewed research articles as well as a national speaker on health and nutrition. She holds a B.S. in Nutrition from NYU, a M.S in Nutrition and Physiology from Columbia University and a Doctorate in Health and Behavior Studies from Columbia University. She is a Registered Dietitian with many years of clinical experience including obesity, diabetes, cancer, heart disease, eating disorders. She is a Certified LEAP therapist to TEST and treat food intolerances.
(646) 362-7135 View (646) 362-7135
Photo of Kristal Pilavas, Nutritionist/Dietitian, MS, CDN, RD, CDCES, CLC
Kristal Pilavas
Nutritionist/Dietitian, MS, CDN, RD, CDCES, CLC
New York, NY 10001
Struggling with weight management issues, unbalanced blood sugars, altered lab values, and in need of some help in managing your diet? With the right information, goals and tools, everyone should be able to live the life they deserve and strive for. Kristal Pilavas is a Registered Dietitian Nutritionist, Certified Diabetes Care & Education Specialist, and Certified Lactation Consultant. Kristal provides nutrition care and counseling for patients and specializes in diabetes, gestational diabetes, perinatal nutrition, heart disease, weight management and more.
Struggling with weight management issues, unbalanced blood sugars, altered lab values, and in need of some help in managing your diet? With the right information, goals and tools, everyone should be able to live the life they deserve and strive for. Kristal Pilavas is a Registered Dietitian Nutritionist, Certified Diabetes Care & Education Specialist, and Certified Lactation Consultant. Kristal provides nutrition care and counseling for patients and specializes in diabetes, gestational diabetes, perinatal nutrition, heart disease, weight management and more.
(646) 553-4006 View (646) 553-4006
Photo of Cristina Veltri Illien, Nutritionist/Dietitian, MS, RD, CDN
Cristina Veltri Illien
Nutritionist/Dietitian, MS, RD, CDN
Online Only
I’m Cristina, a passionate Registered and Licensed Dietitian based in New York City. With years of experience and a deep commitment to women’s health, I’ve dedicated myself to understanding and addressing the unique challenges my female clients face. From navigating PCOS and other hormonal imbalances, to combating fatigue, autoimmune conditions, and relentless digestive issues, I’ve witnessed firsthand the common struggles that many women experience. Recognizing the limitations of conventional approaches and wanting to offer solutions that go beyond simple dietary advice, I immersed myself in the latest research on women’s health.
I’m Cristina, a passionate Registered and Licensed Dietitian based in New York City. With years of experience and a deep commitment to women’s health, I’ve dedicated myself to understanding and addressing the unique challenges my female clients face. From navigating PCOS and other hormonal imbalances, to combating fatigue, autoimmune conditions, and relentless digestive issues, I’ve witnessed firsthand the common struggles that many women experience. Recognizing the limitations of conventional approaches and wanting to offer solutions that go beyond simple dietary advice, I immersed myself in the latest research on women’s health.
(347) 846-2831 View (347) 846-2831
Photo of Janet Levine, Nutritionist/Dietitian, RDN
Janet Levine
Nutritionist/Dietitian, RDN
Online Only
With my help, you can make a lifestyle transition to live longer, be healthy, avoid chronic diseases, and eliminate the need for many medications by enjoying a plant-based diet. Healthy plant based foods can improve health issues related to heart disease (high blood pressure, high cholesterol, stroke, angina), excess weight, diabetes, gastrointestinal disorders (ulcerative colitis, Crohn's disease, irritable bowel syndrome) and other chronic diseases.
With my help, you can make a lifestyle transition to live longer, be healthy, avoid chronic diseases, and eliminate the need for many medications by enjoying a plant-based diet. Healthy plant based foods can improve health issues related to heart disease (high blood pressure, high cholesterol, stroke, angina), excess weight, diabetes, gastrointestinal disorders (ulcerative colitis, Crohn's disease, irritable bowel syndrome) and other chronic diseases.
(914) 326-3060 View (914) 326-3060
Photo of Lellieth Keize, Nutritionist/Dietitian, MS, RDN, CDCES
Lellieth Keize
Nutritionist/Dietitian, MS, RDN, CDCES
New Rochelle, NY 10801
Struggling with diabetes, weight, or digestive issues? I help clients uncover the root causes of symptoms—like inflammation, hormone imbalance, or gut dysfunction—and create personalized, sustainable plans that fit real life. With 16+ years as an RDN and CDCES, I guide you with evidence‑based, functional nutrition so you can lower A1C, improve digestion, boost energy, and feel confident in your health again.
Struggling with diabetes, weight, or digestive issues? I help clients uncover the root causes of symptoms—like inflammation, hormone imbalance, or gut dysfunction—and create personalized, sustainable plans that fit real life. With 16+ years as an RDN and CDCES, I guide you with evidence‑based, functional nutrition so you can lower A1C, improve digestion, boost energy, and feel confident in your health again.
(475) 258-8349 View (475) 258-8349
Photo of Asal Hakim - Pro Nutrition Counseling PLLC- Asal Hakim RD CDN, Nutritionist/Dietitian, RD, CDN, CPT
Pro Nutrition Counseling PLLC- Asal Hakim RD CDN
Nutritionist/Dietitian, RD, CDN, CPT
Garden City, NY 11530
Pro Nutrition Counseling PLLC., is a known health practice that provides nutritional counseling and approaches weight loss & healthy weight weight management in the setting of pre/post bariatric surgery, diabetes, eating disorders, oncology, cardiovascular disease, autoimmune disease, gastrointestinal issues and other nutrition related diseases through patient-centered medical nutrition therapy & nutrition counseling. Giving you an abundance of practical tips and important resources for optimal eating and living, we use practical lifestyle and preventive approach to improving your health!
Pro Nutrition Counseling PLLC., is a known health practice that provides nutritional counseling and approaches weight loss & healthy weight weight management in the setting of pre/post bariatric surgery, diabetes, eating disorders, oncology, cardiovascular disease, autoimmune disease, gastrointestinal issues and other nutrition related diseases through patient-centered medical nutrition therapy & nutrition counseling. Giving you an abundance of practical tips and important resources for optimal eating and living, we use practical lifestyle and preventive approach to improving your health!
(516) 407-7475 View (516) 407-7475
Photo of Jennifer Verola, Nutritionist/Dietitian, MS, RD, CDCES
Jennifer Verola
Nutritionist/Dietitian, MS, RD, CDCES
Online Only
I am interested in the preventive side of healthcare, and truly believe food can be medicine. I view my health as one of the most important things in my life, and I want to encourage my clients to see the value in their health and accomplish their wellness goals. I personally follow a pescetarian, but mostly plant-based diet, and am a huge proponent of any type of movement. I would love to share my knowledge of food and passion for wellness with you, and help you reach your goals.
I am interested in the preventive side of healthcare, and truly believe food can be medicine. I view my health as one of the most important things in my life, and I want to encourage my clients to see the value in their health and accomplish their wellness goals. I personally follow a pescetarian, but mostly plant-based diet, and am a huge proponent of any type of movement. I would love to share my knowledge of food and passion for wellness with you, and help you reach your goals.
(516) 447-2552 View (516) 447-2552
Photo of Jillian Mergruen, Nutritionist/Dietitian, RD, CDN
Jillian Mergruen
Nutritionist/Dietitian, RD, CDN
3 Endorsed
Online Only
If you are struggling with your relationship with food, movement or your body, we might be a good fit to work together! I am a registered dietitian based in New York City who specializes in disordered eating and eating disorder treatment as well as other nutrition-related issues, like diabetes and GI nutrition. If you often feel pre-occupied with food or your body, struggle with feeling chaotic or in control around food, or if it feels hard to feel confident in your food choices, we can do this work together! I am here to support you in finding peace with food and your body. My goal is to help you do sustainable work with support!
If you are struggling with your relationship with food, movement or your body, we might be a good fit to work together! I am a registered dietitian based in New York City who specializes in disordered eating and eating disorder treatment as well as other nutrition-related issues, like diabetes and GI nutrition. If you often feel pre-occupied with food or your body, struggle with feeling chaotic or in control around food, or if it feels hard to feel confident in your food choices, we can do this work together! I am here to support you in finding peace with food and your body. My goal is to help you do sustainable work with support!
(516) 604-3316 View (516) 604-3316
Photo of Rebecca Alcosser, Nutritionist/Dietitian, RD, CDN, CEDS
Rebecca Alcosser
Nutritionist/Dietitian, RD, CDN, CEDS
New York, NY 10007
Food rules have been running so long you cannot remember life without them. You plan around meals, feel guilt before finishing, and know this is not how it should feel—yet it persists. You are not looking for more rules, but a way out of the ones you already have. You know how to fuel performance, but pressure to look or eat a certain way has started shaping your choices beyond energy and recovery. The line between discipline and restriction is getting harder to see. I support dancers, athletes, and performers who want to protect performance while rebuilding a more flexible, sustainable relationship with food.
Food rules have been running so long you cannot remember life without them. You plan around meals, feel guilt before finishing, and know this is not how it should feel—yet it persists. You are not looking for more rules, but a way out of the ones you already have. You know how to fuel performance, but pressure to look or eat a certain way has started shaping your choices beyond energy and recovery. The line between discipline and restriction is getting harder to see. I support dancers, athletes, and performers who want to protect performance while rebuilding a more flexible, sustainable relationship with food.
(332) 264-5969 View (332) 264-5969
Photo of Adiana Castro - Compass Nutrition, Nutritionist/Dietitian, MS, RDN, CDN, CLT
Compass Nutrition
Nutritionist/Dietitian, MS, RDN, CDN, CLT
Online Only
Our patients are often overwhelmed, frustrated, and tired of nutrition plans that don’t work. Many are dealing with symptoms like bloating, fatigue, migraines, blood sugar swings, or weight changes—and want clear answers. They come to us for clarity, relief, and a sustainable way to eat that fits real life. We simplify nutrition with personalized, realistic plans based on how their body responds to food—helping them feel better, understand triggers, and build habits that last.
Our patients are often overwhelmed, frustrated, and tired of nutrition plans that don’t work. Many are dealing with symptoms like bloating, fatigue, migraines, blood sugar swings, or weight changes—and want clear answers. They come to us for clarity, relief, and a sustainable way to eat that fits real life. We simplify nutrition with personalized, realistic plans based on how their body responds to food—helping them feel better, understand triggers, and build habits that last.
(347) 577-9344 View (347) 577-9344
Photo of Alex Gavronsky, Nutritionist/Dietitian, MS, RDN, CDN, CNSC
Alex Gavronsky
Nutritionist/Dietitian, MS, RDN, CDN, CNSC
4 Endorsed
Brooklyn, NY 11217
Alex is a board-certified lead dietitian at one of New York's largest hospitals. He started his private practice to improve access to nutritional counseling and build deep, long-term relationships with patients who are managing nutrition-related health conditions. His work focuses on patients with both chronic and acute/severe conditions, ranging from rapid weight change to cancer. Regardless of health reason, Alex strives to always create a kind and caring environment for his patients.
Alex is a board-certified lead dietitian at one of New York's largest hospitals. He started his private practice to improve access to nutritional counseling and build deep, long-term relationships with patients who are managing nutrition-related health conditions. His work focuses on patients with both chronic and acute/severe conditions, ranging from rapid weight change to cancer. Regardless of health reason, Alex strives to always create a kind and caring environment for his patients.
(716) 576-3638 View (716) 576-3638
Irritable Bowel Syndrome (IBS) Nutritionists and Dietitians
What is Irritable Bowel Syndrome (IBS)?
Irritable bowel syndrome (IBS) is a general term that refers to a collection of symptoms associated with poor gut mobility and function, including abdominal pain, bloating, gas, and diarrhea. IBS is very common, with some estimates suggesting that as many as 10-15% of adults within the United States have IBS. Although the two conditions sound similar and share many symptoms, such as abdominal pain and diarrhea, IBS differs from irritable bowel diseases (IBDs), such as ulcerative colitis and Crohn's disease. In contrast to IBS which is caused by issues in the functioning of the colon, IBDs are inflammatory conditions caused by overactive immune cells within the intestine. IBDs are much less common than IBS and typically more medically severe, occasionally requiring intensive medical treatment and/or surgery. IBS, in contrast, can usually be managed effectively with lifestyle changes and less intense medical intervention.

What are the subcategories of IBS?
Medical professionals generally identify four main types of IBS: IBS-C (constipation-predominant subtype), IBS-D (diarrhea-predominant subtype), IBS-M (mixed bowel subtype), and IBS-U (undefined subtype). Identifying the predominant type of IBS an individual has can be important for determining the type of treatment that is best for them, such as the lifestyle and dietary changes that may be most appropriate, as well as any medications that may be necessary. However, individuals may also experience multiple subtypes over time, as well as experience cycles of flare-ups and symptom relief.

What causes IBS?
The causes of IBS are not well understood, but symptoms are generally attributed to issues with gut muscle contraction and changes in the gut microbiome, both of which can lead to the characteristic symptoms of IBS. These issues can be caused by a variety of lifestyle factors, such as diet and stress. While lifestyle modifications may not completely cure IBS symptoms, identifying symptom-triggering foods, consuming a balanced diet, and reducing stress have all been shown to greatly reduce symptoms. IBS can also be caused by bacterial or parasitic infections within the intestine, in which case the syndrome is referred to as "post-infectious IBS." In contrast to non-infectious IBS, post-infectious IBS is less chronic in nature and symptoms will often resolve once the infection has subsided.

What foods should I avoid if I have IBS?
Specific foods that may trigger symptoms of IBS can vary person-to-person. However, common foods that may exacerbate symptoms include high-fat foods (such as fatty meats), wheat, dairy products, highly acidic foods (such as citrus), beans, cabbage, milk, and carbonated drinks. Over time, individuals with IBS are often able to identify which foods cause their symptoms to worsen and learn to avoid such foods to manage their symptoms.