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Isaac Diaz, RD

4.5
(36)
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In-person
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Background

Are you struggling with your nutrition, weight loss, or fitness goals? You’re not alone — and I’m here to help!

Hi, I’m Isaac, a Licensed Dietitian Nutritionist, Certified Personal Trainer, and Certified Health Education Specialist with years of experience helping clients achieve their health and fitness goals.

As a big-time foodie (yes, including sweets!) and fitness enthusiast, I understand the importance of balancing enjoyment with a healthy lifestyle. I also specialize in food psychology, helping clients build a positive relationship with food while making sustainable, long-term changes.

With my guidance, you’ll receive a personalized nutrition assessment, evidence-based recommendations, and ongoing support—all delivered with professionalism and care.

Let’s work together to unlock your potential and achieve the lasting results you’ve been striving for!

Availability

Approach

Struggling with your nutrition, weight or fitness goals? You’re not alone — and I’m here to change that. I’m Isaac, a Licensed Dietitian Nutritionist, Certified Personal Trainer, and Certified Health Education Specialist. I blend science-based nutrition, fitness, and mindset coaching to create lasting results. Let’s turn your effort into real, sustainable progress — and unlock a stronger, healthier, more confident you!

Specialties

Diabetes
Crohn's Disease
Pregnancy & Postpartum
Gut Health
PCOS
Food Allergies & Sensitivities
Celiac
Bariatric
General Nutrition
Diabetes
High Blood Pressure
High Cholesterol
IBS
Vegan & Vegetarian
Weight Loss
Sports Nutrition
Perimenopause & Menopause
GERD
Cancer / Oncology
IBD
Pediatrics

Modalities

💞
Relationship With Food
🧘
Mind-Body Connection
🍴
Intuitive Eating
🥦
Meal Planning
🔬
Lab Testing
Weight Loss Medication
🔎
FODMAP
💬
Motivational Interviewing
📏
Personalized Macros
💤
Sleep
🚫
Elimination Diet
🥗
Plant-Based
📊
Accountability
🧠
Cognitive Behavioral Therapy (CBT)
🏃
Exercise
❤️
Health At Every Size (HAES)
💊
Supplement Management

Insurance accepted

Aetna, Anthem, Blue Care Network, Blue Cross, Blue Cross Blue Shield, Blue Shield, Carefirst, Cigna, Empire, Golden Rule, Highmark, Horizon, Independence Blue Cross, Kaiser, Optum, Oxford, Regence Blue Cross Blue Shield, Select Health, United Healthcare, United Medical Resources (UMR)

Seeing clients in

AK, AZ, CA, CO, CT, GA, HI, ID, IL, IN, MA, MI, NH, NJ, NY, OK, OR, PA, TX, UT, VT, VA, WA, WV, WI, WY

Location

6929 Valatta Pl, Rancho Cucamonga, CA 91701
Reviews
4.5
36 Reviews
(36)
5
(273)
4
(27)
3
(27)
2
(27)
1
(4)
AI summary of written reviews

Clients consistently describe Jane as warm, knowledgeable, and easy to talk to. Many highlight noticeable improvements in their eating habits, energy, and confidence after just a few weeks of working with her.

While a handful of clients hoped for more structured follow‑up, the vast majority praise her for setting realistic goals and explaining nutrition in a way that finally “clicks.”

Overall, Jane is highly recommended for anyone looking for thoughtful, supportive guidance.

6 clients left publicly written reviews
2 days ago

Jane completely changed how I think about food. She’s patient, knowledgeable, and explains things in a way that actually makes sense.

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