Services

  • NJNS offers 60 or 90 minute assessment and evaluation options. Each includes a comprehensive review of medical history, diet history, current symptoms, supplements and creation of an individualized custom plan.

  • 30 or 60 minute return visits are used to evaluate effectiveness of customized plans created during the initial session, current state of symptoms, any changes in diet / lifestyle / medications or supplements and creation of next steps

  • Includes either a 60 or 90 minute initial consultation with 2x 30 or 60-minute follow up visits at a discounted price

  • Includes 3x 30 or 60-minute follow up visits at a discounted price

  • Not sure if working with NJNS is right for you? Want more information before signing up for a session? Consider booking a free discover call to learn more. Slots available on Wednesdays, Thursdays and Fridays each week.

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General GI including but not limited to:
    • Celiac disease and other gluten-associated disorders
    • Diverticular disease
    • Food allergies, including non-IgE related allergies
    • Gastroesophageal reflux disease (GERD), also called acid reflux
    • Gastroparesis
    • GI cancers, including colorectal, stomach, esophageal
    • Inflammatory bowel diseases (IBD), including Crohn’s disease and ulcerative colitis
    • Intestinal Methanogen Overgrowth (IMO / M-SIBO)
    • Irritable bowel syndrome (IBS) and other disorders of the gut-brain interaction
    • Pelvic floor dysfunction
    • Small intestinal bacterial overgrowth (SIBO)
    • Small bowel obstructions
 
Specialty Conditions including but not limited to:
    • Autoimmune and Auto-Inflammatory Conditions
    • Diabetes Mellitus / Prediabetes
    • Dysautonomia & related conditions such as POTS, hEDS and MCAS
    • Endometriosis and adenomyosis
    • Fertility and Pregnancy nutrition care
    • Longevity, Healthy Lifestyle & Intuitive Eating skills
    • Menopause and Perimenopause
    • Perioperative nutrition optimization
    • Rheumatological conditions such as rheumatoid arthritis and scleroderma
    • Undernutrition / Malnutrition

Conditions Seen

Patient Testimonials

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Patient Testimonials *

“Thank you so much!!! Please know that you truly are the best clinician that I have ever worked with (across any field) and in three short meetings you have made a profound impact on my health and well-being.” - A.G.

“I first consulted with Nancee Jaffe about a year ago for some intractable dietary-related issues.  Her tremendous knowledge, coupled with her caring and supportive nature, were just what I needed.  Her advice has been (and continues to be) terrific and I recommend her highly without any reservation.” - T.L.

“Nancee Jaffe was a blessing in my life at the right time.  I thought I had a food allergy, but Nancee quickly had me make an appointment to see an Allergy Specialist to get to the root cause of the gastrointestinal issues/rashes.  I was not allergic to a specific food, but found out I react to foods high in histamine.  Nancee helped me with proper foods to eat as well as foods to avoid.  I have made changes in my diet, eating much healthier and now feeling much better! Thank you Nancee!” - V.H.

“Nancee is as good as they come! The depth of her knowledge, her practical approach that considers the whole mind and body and her welcoming and inclusive demeanor make her talent unparalleled. I went to 4 doctors when I was tired for over a year and the only one who figured out I had an iron deficiency was Nancee- She's a gem, takes her time and is truly a blessing to have in your corner.” - C.L.

“I want to express my extreme gratitude, to have met and have worked with Nancee Jaffe. She has been truly my anchor, in navigating the complex issues of Disease and nutrition. I had met with 6 other nutritionist. None of them, were at a level of intelligences, to figure out what, I really needed to improve my Health.  Nancee cares at a deep level and becomes your reason for thriving.” - L.D.

“Nancee was a wonderful resource and a huge help in healing my gut health and laying the foundation for a healthy pregnancy. I always found her sessions to be extremely informative and enlightening. She offers up solutions that are approachable, sustainable, and do not disrupt daily living. “ -A.L.

“I was referred to Nancee Jaffe for help treating complex GI issues. She is the first person to address the big picture: nutrition. So many of us ask: what healthy foods will help manage my disease?  How do I shop and prepare meals? How do I make this pleasurable and less stressful? What new products are here? Nancee has pushed these answers forward with science and medicine-based ideas, introducing me to new foods and  supplements to treat micro-nutrient deficiencies and discomfort. Her positive spirit has given me hope and my health continues to improve. I feel so fortunate to be in Nancee Jaffe's care and always look forward to our sessions.” - S.L.

“Whether helping me navigate the confusing and overwhelming initial stages of an autoimmune disease or just giving me insight on day to day nutritional information, I could not speak more highly about my experience working with Nancee. On each of our sessions, she has provided insightful and straightforward explanations of what is happening in my body and then used her extensive digestive knowledge to identify things that would help me to feel better. I can’t recommend Nancee enough!” - M.M.

Our Team

Nancee Jaffe, MS, RDN, CSDH

Founding dietitian of the GI Nutrition Program, UCLA Division of Digestive Disease

Over 13 years experience as an expert GI & Autoimmune Registered Dietitian

Specialties:

  • General GI

  • Disorders of the Gut-Brain Interaction such as Irritable Bowel Syndrome

  • Small Intestinal Bacterial Overgrowth / Intestinal Methanogen Overgrowth

  • Celiac Disease

  • Dysautonomia (POTS, MCAS, EDS)

  • Endometriosis

  • Menopause

  • Longevity & Healthy Lifestyle

Maddie Okmin, MS, RDN

Masters in Nutrition, Healthspan & Longevity, University of Southern California

Specialty training at Cedars-Sinai Inflammatory Bowel Diseases (IBD) Center

Current IBD Dietitian at Cedars-Sinai Medical Center

Specialties:

  • General GI

  • Inflammatory Bowel Disease (Ulcerative Colitis, Crohn’s Disease, Microscopic Colitis)

  • Disorders of the Gut-Brain Interaction such as Irritable Bowel Syndrome

  • Diabetes Mellitus, Prediabetes

  • Perioperative Nutrition Optimization,

  • Undernutrition/Malnutrition

  • Longevity & Healthy Lifestyle

Kelly McNulty, MS, RDN

Clinical training completed at Beth Israel Deaconess Medical Center followed by inpatient roles at Saint John’s and Cedars-Sinai Marina Del Rey

Trained and worked for the GI Nutrition Program, UCLA Division of Digestive Disease

Specialties:

  • General GI

  • Disorders of the Gut-Brain Interaction such as Irritable Bowel Syndrome

  • Celiac Disease

  • Fertility and Pregnancy

  • Longevity & Healthy Lifestyle 

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Media / Publications

Publications

  • Scattaglia S, Jaffe N. Nutrition Management for Functional Dyspepsia. Practical Gastro. Published January 16, 2026.

  • Malnutrition Screening and Registered Dietitian Management: An Inadequately Addressed Burden At A Tertiary IBD CenterT A TERTIARY IBD CENTER, Okmin, Madison et al. Gastroenterology, Volume 168, Issue 3, S78 - S79

  • Okmin, Madison & Zhou, Felix & Castelan, Viankail & Trookman, Benjamin & Ahmed, Waseem & Banty, Andrea & Gu, Phillip & Khanna, Puja & Lamba, Erin & Lee, Susie & Mcgovern, Dermot & Scarcello, Christine & Solomon, Theodore & Targan, Stephan & Vasiliauskas, Eric & Yarur, Andres & Melmed, Gil & Issokson, Kelly. (2025). Tu1965: INCREASED MUSCLE MASS AND STRENGTH IS ASSOCIATED WITH MORE FAVORABLE IBD POSTOPERATIVE OUTCOMES. Gastroenterology. 169. S-1573. 10.1016/S0016-5085(25)04483-X. 

  • Chen E, Mahurkar-Joshi S, Liu C, Jaffe N, Labus J, Dong T, Gupta A, Patel S, Mayer EA, Chang L. The Association Between a Mediterranean Diet and Symptoms of Irritable Bowel Syndrome. Clin Gastroenterol Hepatol. 2024

  • Fansiwala K, Shah ND, McNulty KA, Kwaan MR, Limketkai BN. Use of oral diet and nutrition support in management of stricturing and fistulizing Crohn's disease. Nutr Clin Pract. 2023 Dec;38(6):1282-1295. doi: 10.1002/ncp.11068. Epub 2023 Sep 4. PMID: 37667524.

  • Cuff, C., Lin, L., Mahurkar-Joshi, S., Jacobs, J., Lagishetty,  V., Jaffe, N., Smith, J., Dong, T., Sohn, J., Chang, L., Randomized Controlled Pilot Study Assessing Fructose Tolerance During Fructose Reintroduction in Non-Constipated Irritable Bowel Syndrome Patients Successfully Treated with a Low FODMAP Diet."  accepted for publication in Neurogastroenterology and Motility. Arpil 2023

  • Dua, A; Corson, M; Sauk, J; Jaffe, N; Limketkai, B: Impact of Malnutrition and Nutrition Support in Hospitalized Patients with Inflammatory Bowel Disease. Alimentary Pharmacology & Therapeutic, January 2023

  • Limketkai BN, Hamideh M, Shah R, Sauk JS, Jaffe N. Dietary Patterns and Their Association With SymptoCuff, C., Lin, L., Mahurkar-Joshi, S., Jacobs, J., Lagishetty,  V., Jaffe, N., Smith, J., Dong, T., Sohn, J., Chang,ms Activity in Inflammatory Bowel Diseases. Inflamm Bowel Dis. 2022 Nov 2;28(11):1627-1636. doi: 10.1093/ibd/izab335. PMID: 35092268.

  • Noorian, S. Chau, L. Yaceczko, S. Jaffe, N. Limketkai, B. Perioperative nutrition for gastrointestinal surgery: on the cutting edge; Nutrition in Clinical Practice, 2023

  • Lenhart, A., Labus, J., Joshi, S., Dong, T., Jacobs, J., Jaffe, N. Mayer, E., Chang, L.; Colonic Mucosal Microbiota is Associated with Bowel Habit Subtype and Abdominal Pain in Patients with Irritable Bowel Syndrome, American Journal of Physiology-Gastrointestinal and Liver Physiology, 2022

  • Lenhart, A. Dong, T. Joshi, S. Gupta, A. Liu, C. Jaffe, N. Choo, C. Jacobs, J. Tillisch, K. Labus, J. Mayer, E. Chang, L. (2021). Effect of Exclusion Diets on Symptom Severity and the Gut Microbiota in Patients with Irritable Bowel Syndrome. Clinical Gastroenterology and Hepatology (CGH)

  • Thompson, T., Jaffe, N., Keller, A., Smith, J. (2019) Dietitian experiences using a novel portable personal testing gadget for gluten. Medical Nutrition Matters Newsletter, volume 38, number 1

  • Simpson, S. M., Ciaccio, E. J., Case, S., Jaffe, N., Mahadov, S., Lebwohl, B., & Green, P. H. (2013). Celiac Disease in Patients With Type 1 Diabetes: Screening and Diagnostic Practices. The Diabetes Educator, 39(4), 532-540. 

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