Isaac Diaz, RD
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Isaac Diaz, RD

4.5
(36)
Video calls
In-person
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Background

Are you struggling to lose weight and maintain your progress? Are you struggling with your fitness goals? Look no further—I’m here to help!

Hi, I’m Isaac, a Licensed Dietitian Nutritionist and Certified Personal Trainer at Fit4Life Nutrition, a nationwide telehealth company that specializes in weight loss partnering with Fay.

What sets us apart is our approach, rooted in Motivational Interviewing (MI) and Acceptance and Commitment Therapy (ACT). We help clients build sustainable habits—not quick fixes—by working in a supportive, non-judgmental way to strengthen motivation and align actions with personal values.

Instead of rigid diets, We focus on improving your relationship with food, building consistency, and navigating real-life challenges with practical strategies. We help clients increase mindfulness and flexibility so you can stay committed to your goals even when obstacles arise.

Support doesn’t stop when sessions end. You’ll also receive an evidence-based Motivation & Action Toolkit to help you stay on track between visits, including:

  1. Personalized goals aligned with your values
  2. 7 principles for long-term motivation and commitment
  3. Strength-based quotes for encouragement
  4. Curated recommendations (books, audiobooks, apps, podcasts, YouTube Videos)
  5. Evidence-based weight loss resources

Let’s work together to create lasting change and help you reach the results you’ve been working toward.

Availability

Approach

Struggling to lose weight and keep it off? I’m here to help. I’m Isaac, a Licensed Dietitian Nutritionist and Certified Personal Trainer at Fit4Life Nutrition. What sets me apart from other dietitians:  I use Motivational Interviewing and ACT to help you build sustainable habits, align goals with your values, and stay consistent. You’ll receive a personalized plan, evidence-based guidance, and ongoing support—plus a free motivation and goal toolkit to keep you on track between visits!

Specialties

Diabetes
High Cholesterol
Diabetes
Bariatric
Food Allergies & Sensitivities
Perimenopause & Menopause
Sports Nutrition
PCOS
Celiac
Cancer / Oncology
GERD
Weight Loss
High Blood Pressure
General Nutrition
Vegan & Vegetarian

Diets

Diabetes

Cuisines

Diabetes

I identify as

Diabetes

Languages

Diabetes

Modalities

❤️
Health At Every Size (HAES)
📏
Personalized Macros
🏃
Exercise
📊
Accountability
💬
Motivational Interviewing
🔬
Lab Testing
💊
Supplement Management
🍴
Intuitive Eating
🧘
Mind-Body Connection
💤
Sleep
💞
Relationship With Food
Weight Loss Medication
🥗
Plant-Based

Insurance accepted

Aetna, Anthem, Blue Care Network, Blue Cross, Blue Cross Blue Shield, Blue Shield, Carefirst, Cash Pay, Cigna, Empire, Florida Blue, 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

AL, AK, AZ, AR, CA, CO, CT, DE, DC, FL, GA, HI, ID, IL, IN, IA, KS, LA, ME, MD, MA, MI, MN, MS, MT, NV, NH, NJ, NM, NY, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WV, WI, WY, KY, NE

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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