Meet Alyssa, Virtual Digestive Health Dietitian.

At Nutrition Resolution, we help people get to the root of digestive symptoms, not just manage them. Our work is grounded in functional, evidence-based nutrition and focused on understanding what’s actually driving your symptoms so we can create meaningful, lasting change.

We take a personalized approach, looking beyond surface-level symptoms to factors like gut microbial balance, digestion and absorption, nutrient status, and stress. From there, we build food-friendly plans tailored to your history, goals, and real life.

Our care is collaborative and team-based. Alyssa, our founder and board-certified specialist in digestive health, oversees each client’s strategy, and you’ll work closely with a dedicated GI-focused dietitian who supports implementation, adjustments, and progress, so you’re never doing this alone.

At Nutrition Resolution, we specialize in helping you address the root causes of digestive discomfort and other health concerns—not just managing symptoms. Our holistic, functional approach combines personalized strategies and proven tools to guide you on your healing journey. We believe that true wellness is built on restoring balance to your gut health, with the understanding that it’s not about quick fixes, but sustainable healing.

Wellness begins by truly understanding your unique needs. Rather than just masking the symptoms, we look deeper to uncover the underlying factors that may be affecting your digestion—things like microbiome imbalances, enzyme insufficiencies, nutrient gaps, stress, and even mindset. Together, we’ll work to create a plan that’s designed specifically for you, focusing on healing at the root so you can experience lasting relief and optimal health.

At Nutrition Resolution, we take a collaborative, team-based approach to your healing process. Alyssa, our founder and gut health expert, develops your personalized protocol and oversees your care from a clinical perspective. From there, you’ll be paired with your own GI-focused dietitian, who will work with you closely to implement the plan, make adjustments, and support you through each step. Together, we provide the right balance of strategic guidance and hands-on support, so you never feel like you’re doing this alone.

This isn’t a one-size-fits-all approach. You’ll receive a personalized plan tailored to your unique health history, goals, and symptoms. Whether you’re dealing with digestive issues, fatigue, or other wellness concerns, we’re here to guide you through the process, empowering you with the knowledge and support you need to make lasting change.

By working with us, you’ll gain a clear understanding of the imbalances that might be affecting your gut health—and how to restore it. We’re committed to helping you thrive, inside and out.

Meet Our Team

Alyssa Simpson, RDN, CSDH, CGN

Founder & Registered Dietitian Nutritionist
Board Certified Specialist in Digestive Health
Certified Gastrointestinal Nutritionist

Alyssa Simpson is a Registered Dietitian, a Board Certified Specialist in Digestive Health, and a Certified Gastrointestinal Nutritionist. Her passion for digestive health stems from both professional expertise and personal experience.

After establishing her private practice, Alyssa developed acid reflux herself, giving her firsthand insight into what her patients experience. This personal journey deepened her understanding of how stress triggers digestive issues and how dietary and lifestyle changes can transform health.

With advanced training in medical nutrition therapy, integrative and functional nutrition, specialty testing, and personalized meal planning, Alyssa has helped thousands of patients who previously found no relief through conventional medicine.

Alyssa’s interest in nutrition was shaped by two special people: her mother, who taught her to love healthy food as a child, and her high school cross-country coach, who taught her the importance of eating to fuel performance. When not working with patients, she enjoys hiking, walking her dog, group exercise classes, weight lifting, and running in the Gilbert, AZ area.

Education And Experience
Associations

B.S. in Dietetics, Arizona State University (2003)
Dietetic Registration Exam (2004)
Certified Diabetes Educator (2009)
LEAP Therapist certification (2011)
Private Practice (2012-present)
Partnership with Arizona Digestive Health (since 2013)
Integrative and Functional Medical Nutrition Therapy (IFMNT) Level II & III Certification
Trained in Low FODMAP Diet by Monash University (2023)
Certified Gastrointestinal Nutritionist (2023)
Completed SIBO Mastery Program (2023)
Board Certified Specialist in Digestive Health (CSDH), 2025

Academy of Nutrition and Dietetics (AND)
Nutrition Entrepreneurs (NE)
Dietitians in Integrative and Functional Medicine (DIFM)
Central District of the Arizona Academy of Nutrition and Dietetics (C-AZAND)

Katie Rodriguez, RD, CDCES, IFNCP

Registered Dietitian
Certified Diabetes Care and Education Specialist
Integrative and Functional Nutrition Certified Practitioner

Katie is a Registered Dietitian, Certified Diabetes Care and Education Specialist, and an Integrative and Functional Nutrition Certified Practitioner. With a deep-rooted passion for nutrition, Katie’s journey became personal when she faced a series of complex health challenges, including SIBO, hives, rashes, histamine intolerance, infertility, and adrenal fatigue. After years of unanswered questions, ineffective protocols, and frustrating doctor visits, she turned to functional medicine which was a turning point that not only restored her health but reshaped her mission.

Now, Katie is fiercely dedicated to helping others reclaim their wellness through a science-driven, root-cause approach to care. She focuses on restoring balance in the body’s systems rather than merely managing symptoms, and she’s especially passionate about gut health, nervous system regulation, and personalized healing strategies.

When she’s not working with clients, Katie finds joy in lifting weights, exploring farmers markets, cooking (her favorite love language), and spending time with her husband and their two energetic kids. She loves being outside, basking in the sunshine, being near any body of water, and surrounded by laughter.

Jamie Campbell, MS, CNS, LDN

Certified Nutrition Specialist
Licensed Dietitian Nutritionist

Jamie’s commitment to functional nutrition began long before she entered the field professionally. After navigating her own early struggles with health, food, and a loss of control, she became deeply motivated to help others rebuild trust in their bodies.

Her career began traditionally, first in school nutrition and later in medically supervised weight-loss settings, where she witnessed the limitations of quick-fix approaches and symptom-focused care. These experiences solidified her belief that true healing requires understanding why the body is struggling, not just treating what it’s doing.

Driven to support individuals dealing with complex gut symptoms such as bloat, pain, IBS, food reactivity, SIBO, and long-standing digestive dysfunction, Jamie pursued advanced graduate training and licensure in functional nutrition and functional medicine. She now specializes in root-cause analysis, evidence-informed clinical interventions, and practical, sustainable strategies that help clients finally feel in control of their health again.

Her philosophy is simple: the body isn’t broken. It’s communicating. And when we listen with the right lens, digestive symptoms become a roadmap to resolution rather than a life-long burden.

Today, Jamie helps clients move from confusion and restriction to clarity, resilience, and freedom so they can live, work, and show up for their lives without chronic gut issues holding them back.

Allison Augsburger, RD, LDN, CLT

Registered Dietitian
Licensed Dietitian Nutritionist
Certified LEAP Therapist

Allison is a registered dietitian specializing in gut health and food sensitivities, and pursued advanced study in integrative & functional nutrition after experiencing her own struggles with chronic digestive issues. Once she applied what she learned to heal her own body, Allison became passionate about helping others discover the imbalances and dysfunction that are responsible for their chronic inflammation and symptoms.

Allison’s mission is to create a collaborative partnership with her clients that provides the personalized education and guidance they need to resolve their ongoing health struggles, including IBS, SIBO, GERD, autoimmune & thyroid conditions. It is her priority to allow clients to be heard, and to help them return to or claim the symptom-free life they deserve.

In her free time, Allison enjoys staying active, spending time out in nature, and getting together with friends & family. Favorite activities include yoga, weight lifting, rock climbing, and baking. Travel and live music are priorities, and she always welcomes the opportunity to combine the two.

Danielle Krause, LHC, OHP(T), MCSC-P

Certified Nutritional Consultant
Certified Health Coach

Danielle is a Certified Nutritional Consultant, Certified Health Coach, and former Registered Nurse with a clinical background in Cardiac Critical Care. Her journey into integrative health became deeply personal when two of her three children were diagnosed with chronic conditions, leading her to transition from traditional nursing to a career focused on root-cause prevention and lifestyle transformation. Having navigated her own lifelong health struggles before finally receiving a diagnosis of hypermobile Ehlers-Danlos Syndrome (h-EDS), Danielle brings a unique level of empathy and insight to her practice.

Now, Danielle is passionately committed to helping others who feel stuck in the cycle of chronic illness. She specializes in supporting clients through the complexities of autoimmune conditions, h-EDS, MCAS, dysautonomia, and intricate gut health issues like SIBO. By combining her medical expertise with advanced nutritional training, she empowers her clients to move beyond symptom management and reclaim their vitality. Her advanced nutritional trainings include certifications as a SIBO-Trained Practitioner, a Microbiome Clinical Science Practitioner, and a Wahls Certified Practitioner.

When she is not partnering with clients or pursuing new clinical certifications, Danielle finds joy in the outdoors—whether she is skiing in the winter, cycling and gardening in the summer, or taking long daily walks with her dog. She treasures time with her husband and three adult children, and loves nothing more than a quiet afternoon reading with her cat snuggled beside her.

Courtnay Mecca, MS, CNS, LDN

Certified Nutrition Specialist
Licensed Dietitian Nutritionist

Courtnay is a Licensed Dietitian Nutritionist and Certified Nutrition Specialist whose path into digestive health began with her own health journey. Driven to find true answers and understand the root cause behind her symptoms, she pursued a Master’s degree in Clinical Nutrition and Integrative Health. Having worked alongside therapists, psychiatrists, nurses, and physicians, she understands the complexities of health and the importance of a supportive team. Today, she uses an integrative, functional approach to help clients navigate complex digestive struggles while protecting and healing their relationship with food.

Whether supporting clients through SIBO, IBS, GERD, or gut dysbiosis, Courtnay brings a deeply collaborative approach to care. She meets individuals where they are, emphasizing nervous system safety and sustainable nourishment. She believes meaningful, lasting change happens when people feel heard, respected, and empowered to move at a pace their bodies can genuinely tolerate. Courtnay is passionate about helping clients reduce fear around food, better understand their unique physiology, and build compassionate foundations for long-term gut health.

When she isn’t expanding her knowledge in functional gut health, you can find Courtnay outdoors in nature, whether it’s paddleboarding, hiking, walking, or skiing. To ground herself, she loves spending quality time with her family and dog, experimenting with new recipes in the kitchen, reading, and dabbling in watercolor painting.

Our Commitment to You

When you work with our team, we promise to:

✅Listen attentively to your concerns and experiences
✅Provide personalized care tailored to your unique needs
✅Use advanced testing and evidence-based approaches
✅Offer sustainable solutions, not quick fixes
✅Support you at every step of your wellness journey

We believe in providing relief from symptoms and helping you experience the advantages of good health on your total well-being!

    
 
 
         
   Lori Reardon 
 
 
 
 Trustindex verifies that the original source of the review is Google. Alyssa helped me get my life back! Before seeing her, I was on a liquid diet due to EOE and couldn’t travel due to dietary restrictions and stomach issues. Alyssa took the time to research, test and figure out what was wrong with me and designed an individualized food plan and supplements that helped identify my food allergies and sensitivities, causes of inflammation, and heal my esophagus so I could resume eating solid foods. Thanks to Alyssa I have learned a lot about what and  how to eat and what my body reacts to and now am back to work, travel and my life!
  
 
        
   WeS Edwards 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great Experience- highly recommend- very knowledgeable and helped me tremendously. Thank You!!
  
 
        
   Jon Forbis 
 
 
 
 Trustindex verifies that the original source of the review is Google. Alyssa was extremely knowledgeable and helpful. I feel much better after her suggestions.
  
 
        
   Mike 
 
 
 
 Trustindex verifies that the original source of the review is Google. I cannot recommend Alyssa Simpson enough! After struggling with IBS/SIBO symptoms for nearly a decade, including bloating, gas, cramping, constipation, diarrhea, and related anxiety, I was desperate for relief. Alyssa's expertise and personalized approach were truly game-changing.

From our first consultation, it was clear that Alyssa was deeply knowledgeable and genuinely cared about helping me find solutions. She developed a comprehensive plan that included dietary adjustments, targeted supplements, and practical strategies to manage my symptoms. Her step-by-step guidance on implementing the plan made it easy to follow, even when introducing new elements.

What impressed me most was Alyssa's attention to detail and her ability to adjust the treatment as needed. She was always available to answer questions and provide support throughout the process.

Thanks to Alyssa's care, I've experienced a dramatic and lasting reduction in my symptoms. For the first time in years, I feel in control of my digestive health, and my quality of life has improved significantly. If you're struggling with IBS, SIBO, or any other digestive issues, don't hesitate to consult with Alyssa. Her expertise and compassionate care have been truly transformative for me.
  
 
        
   Tracy Faulkner 
 
 
 
 Trustindex verifies that the original source of the review is Google. I am very happy with the results that I have achieved through Nutrition Resolutions. Alyssa was easy to work with, very knowledgeable, and adjusted her schedule to meet my needs. I was able to meet my goals, improve my gut health, build diversity in my diet, and even dropped my total cholesterol by 70 points. I would highly recommend Alyssa Simpson.
  
 
        
   James Custer 
 
 
 
 Trustindex verifies that the original source of the review is Google. I have been suffering with abdominal pain for 2years. I had ultrasounds and ct scans of abdomin and pelvis, all of them negative. Went to G. I. DR. and he said it was my IBS and I needed a nutritionist and he gave me Alyssa's business card. I called her and it was the best call I ever made. We had a conference call and she suggested test, dietary changes and supplements. I started feeling a little better  with in 3 wks. Test came back negative and she made more dietary changes and supplement changes. With these changes I started feeling really good. The pain, gas, bloating and constant nausea were subsiding. My SIBO turned out to be from sulfur producing bacteria. I eliminated sulfites from my diet for 2 months and I'm slowly reintroducing them into diet. I fell better than I have in 2yrs. I continue my supplements for 2months so I don't backslide. Alyssa is available to answer questions along the way and the 5 video conf. calls are great and she sends a summary of the calls. They are good references.
I can't imagine where I would be health wise without Alyssa.
  
 
        
   Theresa S 
 
 
 
 Trustindex verifies that the original source of the review is Google. I know I never could have gotten rid of my SIBO without Alyssa’s help . I have had it many times and taken so many antibiotic, not realizing I had to do the proper diet & supplements. I would recommend her if you are struggling with any G.I. problems.
  
 
        
   Lynne Sutorka 
 
 
 
 Trustindex verifies that the original source of the review is Google. Alyssa was a God send for me. Over the year I have had 3 bouts of SIBO and was depressed that I could not handle it on my own.
I was told about Alyssa and called  immediately.
It was a miracle she help me understand my problems and how to handle the foods that were right for me
  
 
        
   Chris Cooley 
 
 
 
 Trustindex verifies that the original source of the review is Google. Alyssa has been a lifesaver.  I was diagnosed with EPI, and she was so instrumental is helping me feel like I could be able to manage this going forward. My GI doctor referred me to her.  She was eager to listen to my concerns, questions, and suggestions; I felt like we were a team in this journey to getting my health back on track. I wholeheartedly give her 5 stars.
  
 
        
   Sandra Tapia 
 
 
 
 Trustindex verifies that the original source of the review is Google. Where do I begin- this had been over a 3 year journey in trying to discover what my mother had been suffering from. She had been struggling with painful bloating, extreme gas/belching, loss of weight (30 pounds) occasional vomiting and not been able to eat anything without pain. At her most extreme with this condition- she was not able to even eat a piece of toast without suffering from extreme bloat and severe pain. I had been at my wits end in attempting to find a specialist who would really listen to her and understand what she was dealing with was actually true! The four different G.I specialist I had taken her to sent her for all tests related to the stomach region ( and I mean all- even duplicate tests). I finally found an amazing G.I. specialist who really listened to her and her symptoms and diagnosed her with having SIBO. The specialist stated he was only a single part of her journey to recovery. He recommended, in order to fully overcome her condition, she would need to consult with a nutritionist/dietitian.
So, with that said, she began her journey with Alyssa Simpson. From the beginning, Alyssa provided reassurance that she would overcome SIBO, she was not the only one, and would be able to once again eat without pain. Alyssa has an overwhelming amount of knowledge in supplements and proper diet/food to follow to assist in her recovery process. Alyssa was available to answer all questions and immediately provided other options for supplements and food when needed. Throughout my mother’s journey, she slowly began noticing the ability to eat without suffering from discomfort and began gaining weight once again. My mother finally was able to see the light at the end of the tunnel with Alyssa’s help.
Now, after eight months following with Alyssa, my mother is feeling great and eating as she once did before her condition.  I cannot thank Alyssa enough for all that she has done for my mother.

Lori Reardon

Alyssa helped me get my life back! Before seeing her, I was on a liquid diet due to EOE and couldn’t travel due to dietary restrictions and stomach issues. Alyssa took the time to research, test and figure out what was wrong with me and designed an individualized food plan and supplements that helped identify my food allergies and sensitivities, causes of inflammation, and heal my esophagus so I could resume eating solid foods. Thanks to Alyssa I have learned a lot about what and how to eat and what my body reacts to and now am back to work, travel and my life!

WeS Edwards

Great Experience- highly recommend- very knowledgeable and helped me tremendously. Thank You!!

Jon Forbis

Alyssa was extremely knowledgeable and helpful. I feel much better after her suggestions.

Mike

I cannot recommend Alyssa Simpson enough! After struggling with IBS/SIBO symptoms for nearly a decade, including bloating, gas, cramping, constipation, diarrhea, and related anxiety, I was desperate for relief. Alyssa's expertise and personalized approach were truly game-changing. From our first consultation, it was clear that Alyssa was deeply knowledgeable and genuinely cared about helping me find solutions. She developed a comprehensive plan that included dietary adjustments, targeted supplements, and practical strategies to manage my symptoms. Her step-by-step guidance on implementing the plan made it easy to follow, even when introducing new elements. What impressed me most was Alyssa's attention to detail and her ability to adjust the treatment as needed. She was always available to answer questions and provide support throughout the process. Thanks to Alyssa's care, I've experienced a dramatic and lasting reduction in my symptoms. For the first time in years, I feel in control of my digestive health, and my quality of life has improved significantly. If you're struggling with IBS, SIBO, or any other digestive issues, don't hesitate to consult with Alyssa. Her expertise and compassionate care have been truly transformative for me.

Tracy Faulkner

I am very happy with the results that I have achieved through Nutrition Resolutions. Alyssa was easy to work with, very knowledgeable, and adjusted her schedule to meet my needs. I was able to meet my goals, improve my gut health, build diversity in my diet, and even dropped my total cholesterol by 70 points. I would highly recommend Alyssa Simpson.

James Custer

I have been suffering with abdominal pain for 2years. I had ultrasounds and ct scans of abdomin and pelvis, all of them negative. Went to G. I. DR. and he said it was my IBS and I needed a nutritionist and he gave me Alyssa's business card. I called her and it was the best call I ever made. We had a conference call and she suggested test, dietary changes and supplements. I started feeling a little better with in 3 wks. Test came back negative and she made more dietary changes and supplement changes. With these changes I started feeling really good. The pain, gas, bloating and constant nausea were subsiding. My SIBO turned out to be from sulfur producing bacteria. I eliminated sulfites from my diet for 2 months and I'm slowly reintroducing them into diet. I fell better than I have in 2yrs. I continue my supplements for 2months so I don't backslide. Alyssa is available to answer questions along the way and the 5 video conf. calls are great and she sends a summary of the calls. They are good references. I can't imagine where I would be health wise without Alyssa.

Theresa S

I know I never could have gotten rid of my SIBO without Alyssa’s help . I have had it many times and taken so many antibiotic, not realizing I had to do the proper diet & supplements. I would recommend her if you are struggling with any G.I. problems.

Lynne Sutorka

Alyssa was a God send for me. Over the year I have had 3 bouts of SIBO and was depressed that I could not handle it on my own. I was told about Alyssa and called immediately. It was a miracle she help me understand my problems and how to handle the foods that were right for me

Chris Cooley

Alyssa has been a lifesaver. I was diagnosed with EPI, and she was so instrumental is helping me feel like I could be able to manage this going forward. My GI doctor referred me to her. She was eager to listen to my concerns, questions, and suggestions; I felt like we were a team in this journey to getting my health back on track. I wholeheartedly give her 5 stars.

Sandra Tapia

Where do I begin- this had been over a 3 year journey in trying to discover what my mother had been suffering from. She had been struggling with painful bloating, extreme gas/belching, loss of weight (30 pounds) occasional vomiting and not been able to eat anything without pain. At her most extreme with this condition- she was not able to even eat a piece of toast without suffering from extreme bloat and severe pain. I had been at my wits end in attempting to find a specialist who would really listen to her and understand what she was dealing with was actually true! The four different G.I specialist I had taken her to sent her for all tests related to the stomach region ( and I mean all- even duplicate tests). I finally found an amazing G.I. specialist who really listened to her and her symptoms and diagnosed her with having SIBO. The specialist stated he was only a single part of her journey to recovery. He recommended, in order to fully overcome her condition, she would need to consult with a nutritionist/dietitian. So, with that said, she began her journey with Alyssa Simpson. From the beginning, Alyssa provided reassurance that she would overcome SIBO, she was not the only one, and would be able to once again eat without pain. Alyssa has an overwhelming amount of knowledge in supplements and proper diet/food to follow to assist in her recovery process. Alyssa was available to answer all questions and immediately provided other options for supplements and food when needed. Throughout my mother’s journey, she slowly began noticing the ability to eat without suffering from discomfort and began gaining weight once again. My mother finally was able to see the light at the end of the tunnel with Alyssa’s help. Now, after eight months following with Alyssa, my mother is feeling great and eating as she once did before her condition. I cannot thank Alyssa enough for all that she has done for my mother.

About Nutrition Resolution