Gastrointestinal (GI) Nutritionists and Dietitians in Petaluma, CA

Photo of Amanda Wikan, Nutritionist/Dietitian, MS, RDN
Amanda Wikan
Nutritionist/Dietitian, MS, RDN
Petaluma, CA 94954
I specialize in Irritable Bowel Syndrome and complex gut issues that haven't responded to standard approaches.
My clients typically come to me with some combination of bloating, cramping, urgency, constipation, or diarrhea that hasn't resolved despite consistent effort, and confusion or fear around food after years of conflicting advice. Often, they've seen gastroenterologists and multiple providers without getting a clear answer.
I specialize in Irritable Bowel Syndrome and complex gut issues that haven't responded to standard approaches.
My clients typically come to me with some combination of bloating, cramping, urgency, constipation, or diarrhea that hasn't resolved despite consistent effort, and confusion or fear around food after years of conflicting advice. Often, they've seen gastroenterologists and multiple providers without getting a clear answer.
(707) 868-5718 View (707) 868-5718
Photo of Heather Tasselmyer, Nutritionist/Dietitian, RD
Heather Tasselmyer
Nutritionist/Dietitian, RD
Online Only
I aim to help clients understand the root cause of their symptoms and most importantly how they can use foods and nutrition to help manage their symptoms. Nutrition is not a one size fits all. I take a more holistic, whole person approach to help my clients by reviewing their history, symptoms, labs, or other tests in order to create an individualized nutrition plan. I practice a foods first approach and empower my clients by teaching them useful nutrition information.
I aim to help clients understand the root cause of their symptoms and most importantly how they can use foods and nutrition to help manage their symptoms. Nutrition is not a one size fits all. I take a more holistic, whole person approach to help my clients by reviewing their history, symptoms, labs, or other tests in order to create an individualized nutrition plan. I practice a foods first approach and empower my clients by teaching them useful nutrition information.
(707) 985-2602 View (707) 985-2602

More Dietitians and Nutritionists Nearby

Photo of Haley Mannix, Nutritionist/Dietitian, CNC
Haley Mannix
Nutritionist/Dietitian, CNC
Serves Area
My practice works with motivated and curious individuals looking for integrative and functional nutrition to investigate the root drivers of digestive issues, microbiome imbalances, acne, and hormone, metabolic and immune imbalances.
Through a combination of evidence-based functional testing, blood chemistry analysis, glucose monitoring, tailored dietary modifications, targeted supplementation protocols, and a highly personalized and nuanced approach, I aim to identify imbalances and devise a plan that is both results driven and attainable.
My practice works with motivated and curious individuals looking for integrative and functional nutrition to investigate the root drivers of digestive issues, microbiome imbalances, acne, and hormone, metabolic and immune imbalances.
Through a combination of evidence-based functional testing, blood chemistry analysis, glucose monitoring, tailored dietary modifications, targeted supplementation protocols, and a highly personalized and nuanced approach, I aim to identify imbalances and devise a plan that is both results driven and attainable.
(415) 594-5248 View (415) 594-5248
Photo of Dr. Lillie Luu Nguyen, Nutritionist/Dietitian, DCN, CNS, LDN
Dr. Lillie Luu Nguyen
Nutritionist/Dietitian, DCN, CNS, LDN
1 Endorsed
Serves Area
I specialize in helping adults dealing with chronic digestive troubles and support you in managing hormonal imbalances, whether it's Diabetes, Thyroid issues, or Women's Health concerns like PMS, PCOS, menopause, or infertility.
Navigating the path to better nutrition and well-being can be challenging, but you don't have to go it alone. Using doctorate-level education rooted in evidence-based science, I'm here to support you with a personalized nutrition plan that not only tastes great, but also nourishes your body. We'll take a holistic approach to your health, considering all aspects of your life. If you're curious about lab tests, supplements, or assessments, we can explore those options together.
I specialize in helping adults dealing with chronic digestive troubles and support you in managing hormonal imbalances, whether it's Diabetes, Thyroid issues, or Women's Health concerns like PMS, PCOS, menopause, or infertility.
Navigating the path to better nutrition and well-being can be challenging, but you don't have to go it alone. Using doctorate-level education rooted in evidence-based science, I'm here to support you with a personalized nutrition plan that not only tastes great, but also nourishes your body. We'll take a holistic approach to your health, considering all aspects of your life. If you're curious about lab tests, supplements, or assessments, we can explore those options together.
(415) 322-5629 View (415) 322-5629
Photo of Kia Sanford, Nutritionist/Dietitian, MS
Kia Sanford
Nutritionist/Dietitian, MS
2 Endorsed
San Rafael, CA 94915
What we eat, drink and even the air we breathe can have profound effects on our well being. By making food our medicine, Functional Clinical Nutrition transforms the daily rituals of eating into health sustaining practices. In recognizing that medicine can be food, these practices bring the mystery of attaining and maintaining within our reach. (Due to so many solicitations I must state I am not now, nor will I ever be, interested in being a part of a multi-level marketing company. Please DO NOT contact me about Mila, Isagenix, JuicePlus, or any other "opportunity". Thank you.)
What we eat, drink and even the air we breathe can have profound effects on our well being. By making food our medicine, Functional Clinical Nutrition transforms the daily rituals of eating into health sustaining practices. In recognizing that medicine can be food, these practices bring the mystery of attaining and maintaining within our reach. (Due to so many solicitations I must state I am not now, nor will I ever be, interested in being a part of a multi-level marketing company. Please DO NOT contact me about Mila, Isagenix, JuicePlus, or any other "opportunity". Thank you.)
(415) 969-5835 View (415) 969-5835
Photo of Norae Berry, Nutritionist/Dietitian, MS, RD, CLT
Norae Berry
Nutritionist/Dietitian, MS, RD, CLT
Serves Area
Nutrition Counseling & Corporate Wellness Solutions, MRT LEAP food sensitivity testing/treatment. I always coordinate with your doctor when it is needed for your care. Conditions/diet therapies I work with often are: Food Allergy/Sensitivity IBS/IBD, Migraines, Fybromyalgia, Weight Management, Metabolic Syndrome, Pre Diabetes and Diabetes, High Cholesterol or High Blood Pressure, low FODMAP, pre-dialysis Kidney Disease, Pregnancy and Breastfeeding, Elite Sports Performance, and Eating Disorders. Email me with questions about therapy and to schedule a virtual visit at this time. I look forward to working with you!
Nutrition Counseling & Corporate Wellness Solutions, MRT LEAP food sensitivity testing/treatment. I always coordinate with your doctor when it is needed for your care. Conditions/diet therapies I work with often are: Food Allergy/Sensitivity IBS/IBD, Migraines, Fybromyalgia, Weight Management, Metabolic Syndrome, Pre Diabetes and Diabetes, High Cholesterol or High Blood Pressure, low FODMAP, pre-dialysis Kidney Disease, Pregnancy and Breastfeeding, Elite Sports Performance, and Eating Disorders. Email me with questions about therapy and to schedule a virtual visit at this time. I look forward to working with you!
(415) 578-6098 View (415) 578-6098
Photo of Sarah Reilly, Nutritionist/Dietitian, CNC, CNBP, AFMHCp
Sarah Reilly
Nutritionist/Dietitian, CNC, CNBP, AFMHCp
Serves Area
I will help you get to the root cause of your annoying symptoms so you can FINALLY lose weight, have more energy and less pain & digestive issues.
I am a Functional Medicine Nutritionist & Burnout Recovery Specialist. I combine Holistic Clinical Nutrition & Functional Medicine principles to provide a comprehensive and personalized process to achieve your goals. In clinical practice for 16 years, I continue studies in these powerful disciplines to stay on the forefront of cutting edge applications.
I will help you get to the root cause of your annoying symptoms so you can FINALLY lose weight, have more energy and less pain & digestive issues.
I am a Functional Medicine Nutritionist & Burnout Recovery Specialist. I combine Holistic Clinical Nutrition & Functional Medicine principles to provide a comprehensive and personalized process to achieve your goals. In clinical practice for 16 years, I continue studies in these powerful disciplines to stay on the forefront of cutting edge applications.
(925) 886-3630 View (925) 886-3630
Photo of Brenna O'Malley, Nutritionist/Dietitian, RD
Brenna O'Malley
Nutritionist/Dietitian, RD
Online Only
Waitlist for new clients
Hi, I'm Brenna! I work with adolescents, teens and adults who are struggling with disordered eating, recovery from chronic dieting, binge-restrict cycles, body image concerns and wanting to be able to pursue health without obsession. It's common to be interested in or passionate about food, health, wellness exercise - but when those interests become inflexible, or don't allow for you to spend time and feel present doing other things that are important to you, it can be a sign to reach out.
Hi, I'm Brenna! I work with adolescents, teens and adults who are struggling with disordered eating, recovery from chronic dieting, binge-restrict cycles, body image concerns and wanting to be able to pursue health without obsession. It's common to be interested in or passionate about food, health, wellness exercise - but when those interests become inflexible, or don't allow for you to spend time and feel present doing other things that are important to you, it can be a sign to reach out.
(415) 798-9738 View (415) 798-9738
Photo of Sabine Haake - Sabine Haake RD, Nutritionist/Dietitian, RD
Sabine Haake RD
Nutritionist/Dietitian, RD
San Rafael, CA 94903
We eat at least 3-4 times a day or 21-28 times a week. Eating is an activity we have been engaging in since we were born. We used to know when we were hungry and when we were full. When this energy giving and life sustaining act becomes a source of confusion, guilt and fear, when eating becomes disordered and turns into a dangerous coping mechanism, it is time to evaluate what we are doing and explore how we can normalize our behavior so our minds and body can function in a healthy way to support our goals.
We eat at least 3-4 times a day or 21-28 times a week. Eating is an activity we have been engaging in since we were born. We used to know when we were hungry and when we were full. When this energy giving and life sustaining act becomes a source of confusion, guilt and fear, when eating becomes disordered and turns into a dangerous coping mechanism, it is time to evaluate what we are doing and explore how we can normalize our behavior so our minds and body can function in a healthy way to support our goals.
(415) 233-7588 View (415) 233-7588
Photo of Christy Walowit, Nutritionist/Dietitian, MS, RDN, CDCES
Christy Walowit
Nutritionist/Dietitian, MS, RDN, CDCES
Serves Area
Learn to work WITH your body, not against it! Believe it or not, you and your body are on the same team. If you're experiencing health anxiety, navigating a challenging diagnosis, or just confused about what to eat, I'm glad you're here! As your Registered Dietitian and Diabetes Specialist, I like to imagine myself as your guide to filter through all the "diet noise," medical jargon, and confusing food narratives so you can feel grounded and clear about what your body needs.
Learn to work WITH your body, not against it! Believe it or not, you and your body are on the same team. If you're experiencing health anxiety, navigating a challenging diagnosis, or just confused about what to eat, I'm glad you're here! As your Registered Dietitian and Diabetes Specialist, I like to imagine myself as your guide to filter through all the "diet noise," medical jargon, and confusing food narratives so you can feel grounded and clear about what your body needs.
(916) 775-8179 View (916) 775-8179
Photo of Ally Green, Nutritionist/Dietitian, MS, MPH, RD
Ally Green
Nutritionist/Dietitian, MS, MPH, RD
Greenbrae, CA 94904
I specialize in helping people improve their relationship with food, heal from disordered eating, and address digestive health concerns.
I offer virtual 1:1 sessions—60 minutes for initial appointments and 45 minutes for follow-ups.
I specialize in helping people improve their relationship with food, heal from disordered eating, and address digestive health concerns.
I offer virtual 1:1 sessions—60 minutes for initial appointments and 45 minutes for follow-ups.
(925) 291-9338 View (925) 291-9338
Photo of Dr. Rosa M Keller - Rosa Keller Nutrition, Nutritionist/Dietitian, PhD, RD
Rosa Keller Nutrition
Nutritionist/Dietitian, PhD, RD
Serves Area
Whether that means understanding how to improve your relationships with food, weight management, fuel exercise performance, finding a meal pattern that improves digestive symptoms, managing chronic disease and more.
I use evidence-based research and real-life tools to help design eating patterns and meal ideas to support your lifestyle changes. My training is in sports nutrition, fueling exercise and learning to manage your chronic diseases including diabetes, high blood pressure, high cholesterol, kidney disease and liver disease.
Whether that means understanding how to improve your relationships with food, weight management, fuel exercise performance, finding a meal pattern that improves digestive symptoms, managing chronic disease and more.
I use evidence-based research and real-life tools to help design eating patterns and meal ideas to support your lifestyle changes. My training is in sports nutrition, fueling exercise and learning to manage your chronic diseases including diabetes, high blood pressure, high cholesterol, kidney disease and liver disease.
(415) 712-2516 View (415) 712-2516
Photo of Toni Kohn, Nutritionist/Dietitian, MS, RD
Toni Kohn
Nutritionist/Dietitian, MS, RD
Richmond, CA 94804
I have specialized in Eating Disorders for 30 years. I am passionate about helping people get rid of the guilt and shame that has people stuck in unhealthy patterns, and replacing those voices with a balanced and stress free relationship with both food and body issues. It is possible to completely heal ones relationship with food! We can do it, together. You deserve your life back!
I have specialized in Eating Disorders for 30 years. I am passionate about helping people get rid of the guilt and shame that has people stuck in unhealthy patterns, and replacing those voices with a balanced and stress free relationship with both food and body issues. It is possible to completely heal ones relationship with food! We can do it, together. You deserve your life back!
(424) 370-0631 View (424) 370-0631

Online Dietitians and Nutritionists

Photo of Stephanie Brooks - Bay Area Nutrition, Nutritionist/Dietitian, RDN
Bay Area Nutrition
Nutritionist/Dietitian, RDN
Campbell, CA 95008
If you or a family member is struggling with food/nutrition, frustrated with random nutrition information out there or has a nutrition related problem or diagnosis, the RDs and Nutrition Support Mentors at Bay Area Nutrition are available to help. We are dedicated to treating you, the whole person, via education, support, and devising a plan with you and for you. Our team will collaborate with other care providers on your team as needed so you can optimize your health and well-being.
If you or a family member is struggling with food/nutrition, frustrated with random nutrition information out there or has a nutrition related problem or diagnosis, the RDs and Nutrition Support Mentors at Bay Area Nutrition are available to help. We are dedicated to treating you, the whole person, via education, support, and devising a plan with you and for you. Our team will collaborate with other care providers on your team as needed so you can optimize your health and well-being.
(408) 956-6783 View (408) 956-6783
Photo of Grace Aguirre, Nutritionist/Dietitian, MS, RDN, IFNCP, CLT
Grace Aguirre
Nutritionist/Dietitian, MS, RDN, IFNCP, CLT
1 Endorsed
Online Only
As a Sacramento Area-based functional dietitian, I help clients heal the gut, support metabolism, and find balance with food and weight — without extremes.
Tired of bloating, fatigue, or unexplained weight changes that don’t make sense no matter what you eat? I help people frustrated by food sensitivities, IBS, and stubborn metabolism issues uncover the root causes driving their symptoms. My functional-nutrition approach helps you calm inflammation, balance digestion and hormones, and rebuild trust in your body so energy, clarity, and a healthy weight become natural outcomes — not obsessions.
As a Sacramento Area-based functional dietitian, I help clients heal the gut, support metabolism, and find balance with food and weight — without extremes.
Tired of bloating, fatigue, or unexplained weight changes that don’t make sense no matter what you eat? I help people frustrated by food sensitivities, IBS, and stubborn metabolism issues uncover the root causes driving their symptoms. My functional-nutrition approach helps you calm inflammation, balance digestion and hormones, and rebuild trust in your body so energy, clarity, and a healthy weight become natural outcomes — not obsessions.
(916) 659-7505 View (916) 659-7505
Photo of Terri Oberto, Nutritionist/Dietitian, CNC, CPT, PHT, BS
Terri Oberto
Nutritionist/Dietitian, CNC, CPT, PHT, BS
Santa Cruz, CA 95060
For 19 years , I have seen clients with a variety of issues- allergies, auto-immune, diabetes, blood sugar imbalances, arthritis, viruses, parasites, candidiasis, Lyme disease, endocrine imbalances, weight management, digestive problems, obsessive compulsive disorder, cardiovascular, hormone replacement, ADHD , anti-aging, mind-body connection work and cancer.
Our office provides extensive evaluation of questionnaires, diet analysis, urine and blood analysis from state of the art labs, in-office and home testing, Kinesiology and Sclerology. This evaluation generates a detailed protocol which is discussed in a lengthy consultation with you. We also offer several modalities which may help with issues you would like to address. These include Biofeedback, Rife, Galvanic Spa and infra red laser technologies, as well as aromatherapy, infra red sauna, cellular detox foot bath, and alkalizing therapies.
For 19 years , I have seen clients with a variety of issues- allergies, auto-immune, diabetes, blood sugar imbalances, arthritis, viruses, parasites, candidiasis, Lyme disease, endocrine imbalances, weight management, digestive problems, obsessive compulsive disorder, cardiovascular, hormone replacement, ADHD , anti-aging, mind-body connection work and cancer.
Our office provides extensive evaluation of questionnaires, diet analysis, urine and blood analysis from state of the art labs, in-office and home testing, Kinesiology and Sclerology. This evaluation generates a detailed protocol which is discussed in a lengthy consultation with you. We also offer several modalities which may help with issues you would like to address. These include Biofeedback, Rife, Galvanic Spa and infra red laser technologies, as well as aromatherapy, infra red sauna, cellular detox foot bath, and alkalizing therapies.
(831) 400-3405 View (831) 400-3405
Photo of Whitney Lau, Nutritionist/Dietitian, RDN
Whitney Lau
Nutritionist/Dietitian, RDN
Online Only
Struggling with digestive issues, period problems, thyroid problems, fertility challenges, or menopause symp?
My approach is rooted in integrative and functional nutrition therapy, designed to heal and support full mind and body wellness. We’ll delve deep, uncovering the underlying factors driving your symptoms through advanced testing, such as comprehensive blood panels, hair tissue mineral analysis, GI-MAP Gut tests, and/ or DUTCH complete hormone testing.
Struggling with digestive issues, period problems, thyroid problems, fertility challenges, or menopause symp?
My approach is rooted in integrative and functional nutrition therapy, designed to heal and support full mind and body wellness. We’ll delve deep, uncovering the underlying factors driving your symptoms through advanced testing, such as comprehensive blood panels, hair tissue mineral analysis, GI-MAP Gut tests, and/ or DUTCH complete hormone testing.
(510) 726-4221 View (510) 726-4221
Photo of Stephanie Paver, Nutritionist/Dietitian, MS, RD
Stephanie Paver
Nutritionist/Dietitian, MS, RD
1 Endorsed
Online Only
If you've been living for years with PCOS, and you've tried everything to control your symptoms, get your period back, and get pregnant but remain frustrated by the lack of results, I want you to know there’s a better way! There are solutions beyond birth control, metformin, fertility treatment, strict diets, and aggressive exercise. If you're looking for a healthcare provider who really knows PCOS and who will customize a plan specific to your needs, I would love to partner with you! I offer a safe space, compassionate care, education, sustainable modifications, and non-pharmaceutical solutions to help you take charge of your PCOS.
If you've been living for years with PCOS, and you've tried everything to control your symptoms, get your period back, and get pregnant but remain frustrated by the lack of results, I want you to know there’s a better way! There are solutions beyond birth control, metformin, fertility treatment, strict diets, and aggressive exercise. If you're looking for a healthcare provider who really knows PCOS and who will customize a plan specific to your needs, I would love to partner with you! I offer a safe space, compassionate care, education, sustainable modifications, and non-pharmaceutical solutions to help you take charge of your PCOS.
(602) 313-1838 View (602) 313-1838
Photo of Kerri Mulligan - Kerri Mulligan, RD, Nutritionist/Dietitian, RD
Kerri Mulligan, RD
Nutritionist/Dietitian, RD
Online Only
Emotional eating is a condition that is widely misunderstood. All too often, it is assumed that emotional eaters have no willpower over food or lack the motivation for change. Feelings of guilt, shame, and even loneliness can create a perpetual cycle of dieting and deprivation followed by uncontrolled eating. If this feels familiar to you, I want you to know that you are not alone. I can help you understand this cycle to develop a better relationship with food. I provide education to clear up conflicting nutrition facts, challenge diet myths, and work with you to discover a pattern of eating that supports your health.
Emotional eating is a condition that is widely misunderstood. All too often, it is assumed that emotional eaters have no willpower over food or lack the motivation for change. Feelings of guilt, shame, and even loneliness can create a perpetual cycle of dieting and deprivation followed by uncontrolled eating. If this feels familiar to you, I want you to know that you are not alone. I can help you understand this cycle to develop a better relationship with food. I provide education to clear up conflicting nutrition facts, challenge diet myths, and work with you to discover a pattern of eating that supports your health.
(210) 941-2940 View (210) 941-2940
Photo of Emerald Santacruz, Nutritionist/Dietitian, BCHN, NBC-HWC, AIPCC
Emerald Santacruz
Nutritionist/Dietitian, BCHN, NBC-HWC, AIPCC
Online Only
I emphasize the power that food has on systems and processes like inflammation, gut health, and the immune system.
If you are having trouble adapting to life with an autoimmune condition, you are not alone. Many look for natural options to support autoimmune conditions but expert guidance for this is not readily available in the conventional medical system. Whether you were just diagnosed or have been struggling for years, you can benefit from the support of an autoimmune wellness expert. From autoimmune friendly recipes, supportive supplements and herbs, or guidance on underlying health imbalances, I strive to help you feel your best, and in control of your health, despite autoimmunity.
I emphasize the power that food has on systems and processes like inflammation, gut health, and the immune system.
If you are having trouble adapting to life with an autoimmune condition, you are not alone. Many look for natural options to support autoimmune conditions but expert guidance for this is not readily available in the conventional medical system. Whether you were just diagnosed or have been struggling for years, you can benefit from the support of an autoimmune wellness expert. From autoimmune friendly recipes, supportive supplements and herbs, or guidance on underlying health imbalances, I strive to help you feel your best, and in control of your health, despite autoimmunity.
(916) 347-5421 View (916) 347-5421
Gastrointestinal (GI) Nutritionists and Dietitians
What is gut health?
Gut health refers to the overall functioning and well-being of the gastrointestinal (GI) system. Key to gut health is the gut microbiome, which is the collection of healthy bacteria living in the gut. These bacteria are essential for the digestion and breakdown of food, and their health significantly impacts digestion. Poor gut health can result in symptoms such as bloating, gas, diarrhea, constipation, and general abdominal discomfort, which may indicate imbalances or issues with the gut microbiome.

Can diet help with GI issues?
Diet plays a major role in gut health, and changes in diet can often reduce or eliminate some of the symptoms associated with gastrointestinal (GI) issues. Often, GI distress is due to food intolerances or sensitivities, such as gluten sensitivity or lactose intolerance. In these cases, eliminating the problematic foods from the diet can resolve the issue. GI problems can also stem from a combination of environmental or genetic factors, such as in the case of irritable bowel syndrome (IBS). Disruptions in the gut microbiome, such as those caused by taking antibiotics, can also lead to GI issues. In both scenarios, maintaining a balanced diet as much as possible with foods that support a healthy microbiome—such as fruits, vegetables, whole grains, and probiotic foods—can often significantly reduce symptoms and improve gut health.

What are the best foods for gut health?
Maintaining a balanced microbiome is essential for gut health, and this is best achieved through a varied diet rich in fruits, vegetables, and probiotic foods. Fruits and vegetables provide essential nutrients and fiber, which nourish the beneficial bacteria in the gut. Probiotic foods, which are those that contain live bacteria, are also great for gut health. Consuming probiotic foods and drinks, such as yogurt, kefir, kombucha, and tempeh, can help support the microbiome by contributing to the diversity of bacteria within the gut.

When should I see a dietitian for GI issues?
Many people can benefit from seeing a dietitian for GI issues. In general, most dietitians are knowledgeable about what foods support gut health and may help clients choose foods that support a healthy GI system, such as fruits and vegetables high in fiber or foods high in probiotics. Dietitians may be especially beneficial to clients with known gastrointestinal concerns, such as irritable bowel syndrome (IBS) or gastroesophageal reflux disease (GERD). For clients diagnosed with these or similar conditions, dietitians can help clients identify food triggers and develop a meal plan for the client that minimizes symptoms. Dietitians may also work with clients who are having gastrointestinal distress (such as bloating, gas, constipation, diarrhea, etc.) but are not aware of the cause of their symptoms. In such cases, dietitians may be able to help the client identify the cause of the GI distress and coordinate with other medical professionals to help the client better manage their symptoms.