What patients are saying
Overall rating
5.00
Average wait time
5.00
Bedside manner
5.00
“Isaac is great! It really seems like he “gets it” and he has an impressive, multidisciplinary knowledge. He was delivering breakthroughs as early as our first session!”
BPLess than 6 months ago
“I am very pleased with the work I have done with Isaac. He listens and provides manageable steps and actions you can take to meet your goals. He shares knowledge so that you can make good decisions and choices on the way to a healthier lifestyle. Highly recommend!??????”
DHLess than 6 months ago
About Isaac Diaz
***PLEASE READ: Your appointment time is reserved just for you. If you need to modify, we ask for advance notice. Changes made within 72 hours (3 days) of appointment time will incur a $100 fee as it can be difficult for us to fill that time on short notice with another client in need of care. We thank you for your understanding and respect of our time. To reserve your appointment, we ask for a card on file even if you have insurance. You’ll also receive 3 quick forms by email from Carepatron to complete, including an optional but recommended insurance verification form as not all in-network insurance plans cover nutrition telehealth benefit.
Are you struggling to lose weight and maintain your progress? 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 Zocdoc.
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, podcasts, YouTube)
5. Evidence-based weight loss resources
Let’s work together to create lasting change you’ve been striving for!
Is this doctor in your insurance network?
Enter your insurance carrier and plan
choose insurance
In-network insurances
99% of patients have successfully booked with these insurances
Aetna
BlueCross BlueShield
UnitedHealthcare
Education and background
Practice names
Board certifications
- Commission on Dietetic Registration
- Registered Dietitian (RD) (Commission on Dietetic Registration)
- Registered Dietitian Nutritionist (RDN) (Commission on Dietetic Registration)
Education and training
- California State University, San Bernardino, Bachelor's in Food and Nutrition Science
- California State University, San Bernardino, Master's in Public Health
Languages spoken
- English
- Spanish
Provider's gender
Male
Patient reviews
All reviews have been submitted by patients after interacting with the practice.
Overall rating
5.00
Wait time
5.00
Bedside manner
5.00
Your trust is our top concern, so providers can't pay to alter or remove reviews. We also don't publish reviews that contain any private patient health information. Learn more here
21 reviews
Most relevant
Issac provided a good foundation for nutrition. Would recommend for anyone wanting to eat better and feel better.
Less than 1 year agoPP
Isaac was very personable, he answered my questions and I have high hopes for our next session.
Less than 1 year agoDP
Isaac Diaz is knowledgeable and an excellent listener. I would definitely recommend him.
Less than 1 year agoMT
Very professional and very friendly while explaining things that are completely understand
Less than 1 year agoHH
I learned a lot! I can’t wait to learn more about nutrition and ways to improve my health.
Less than 1 year agoSS
Isaac was professional and helpful in all sessions
More than 1 year agoAV
Isaac is great! It really seems like he “gets it” and he has an impressive, multidisciplinary knowledge. He was delivering breakthroughs as early as our first session!
Less than 6 months agoBP
I am very pleased with the work I have done with Isaac. He listens and provides manageable steps and actions you can take to meet your goals. He shares knowledge so that you can make good decisions and choices on the way to a healthier lifestyle. Highly recommend!??????
Less than 6 months agoDH
He was very welcoming and friendly, yet professional. Definitely felt like he was there to support me and my goals in the best way possible. Highly recommend him to anyone especially for athletic goals!
Less than 6 months agoDC
Seeing Isaac as a dietitian was a great decision. He was very easy to talk to, and appreciated my honesty and bluntness. He listened to my concerns, and offered realistic solutions and advice. I know my body and some of what works for me (and what probably doesn’t). I know I don’t always make the best choices with my diet. But he never judged me for that. He was professional and helpful during our conversation—so much so, that it felt like I was talking to a friend or coworker. I highly recommend him as a dietitian.
August 20, 2025William C.Verified patientVideo visit
My appointment with Isaac was great! He asked me so many questions and he could
Identify the mistakes was doing in my diet. He answered all my questions and elaborated a very good plan for me to loose weight. I can’t wait for next visit. Thanks.
Less than 1 year agoSF
Dr. Isaac was very friendly and took the time to listen to my concerns and needs. I learned a lot from him and about myself during the appointment and I appreciated his grace-based approach to nutrition, health and fitness.
August 11, 2025Katlyn S.Verified patientVideo visit
Good listener and knowledgeable
Less than 1 year agoJF
Issac is great to talk with. He is easy going and can relate.
He took the time to address all of my questions. I especially liked thathe took notes so that he didn't miss any points in my multiple part questions.
Less than 1 year agoAD
Isaac is a great clinician. Personable and understanding, his approach to diets is small meaningful changes to better for choices. He takes into account his clients' living situation and conditions to tailor the best approach to reach attainable goals and remembers the little details over sessions making his bedside manner more akin to a foodie friend than a doctor treating yet another patient.
Less than 1 year agoJB
I really liked working with Isaac! It was really helpful to have an audit of my eating habits, and I learned a lot over the course of my visits!
More than 1 year agoGL
Issac was very professional and listened to my wants and needs. Which in turn, helped us make actionable goals to strive for. He further provided me with useful resources that helped me track my diet so I could stay consistent and have a record to refer back to!
More than 1 year agoCC
Less than 1 year agoInitials hidden
Less than 1 year agoInitials hiddenVideo visit
More than 1 year agoJR
More than 1 year agoCH
How soon can I make an appointment with Isaac Diaz?
Generally, Isaac Diaz has appointments available on Zocdoc within 1 week. You can see Isaac Diaz's earliest availability on Zocdoc and make an appointment online.
Is Isaac Diaz accepting new patients?
Isaac Diaz generally accepts new patients on Zocdoc. You can see Isaac Diaz's earliest availability on Zocdoc and schedule an appointment online.
Does Isaac Diaz accept my insurance?
Choose your insurance plan to verify if Isaac Diaz is in-network.
Can I make an appointment with Isaac Diaz online?
Yes, you can make an appointment online with Isaac Diaz using Zocdoc. It’s simple, secure, and free.
What practice does Isaac Diaz work with?
Isaac Diaz works with Fit4Life Nutrition.
Which board certifications does Isaac Diaz have?
Isaac Diaz is certified by Commission on Dietetic Registration, Registered Dietitian (RD) (Commission on Dietetic Registration), and Registered Dietitian Nutritionist (RDN) (Commission on Dietetic Registration).
What languages does Isaac Diaz speak?
Isaac Diaz speaks English and Spanish.
How do patients rate Isaac Diaz in reviews?
21 patients have reviewed Isaac Diaz. The overall rating for this doctor is 5/5. They have a 5/5 rating for bedside manner and a 5/5 rating for wait time. You can read individual reviews and ratings on their profile.