Meet Weight Loss Specialist Kristen Ash, FNP-C, FNP-BC

Partnering with patients every step of the way through personalized care focused on lasting weight loss and better health.

Nurse Practitioner

Kristen Ash, FNP-C, FNP-BC, is a dedicated Nurse Practitioner at Scottsdale Weight Loss Center, where she is passionate about helping patients build sustainable habits and achieve long-term weight management success. She approaches care with warmth, collaboration, and evidence-based guidance, empowering each patient to feel confident, supported, and capable at every step of their journey.

Kristen earned her Master of Science in Nursing and Family Nurse Practitioner certification following a broad and diverse career as a registered nurse. Her RN background includes critical care, pediatric CVICU, and leadership positions in both endoscopy and interventional radiology/cath lab. She holds her national board certification as an FNP and maintains licensure in the state of Arizona.

Before joining Scottsdale Weight Loss Center, Kristen practiced in primary care, diagnosing and managing a wide range of chronic and acute conditions including hypertension, obesity, diabetes, coronary artery disease, and more. Her clinical interests include obesity medicine, nutrition, and lifestyle-based approaches to improving overall health. With years of hands-on experience across multiple specialties, she brings a comprehensive and compassionate perspective to weight-focused care.

Kristen believes in meeting patients exactly where they are and helping them create practical, achievable steps toward better health. She values open communication, individualized treatment plans, and a supportive partnership that honors each patient’s unique goals. Her motivation comes from seeing patients regain confidence, energy, and a sense of control over their well-being—core values that align with the mission of Scottsdale Weight Loss Center.

Outside of work, Kristen is a mom to a little girl and enjoys staying active through functional fitness and hiking. She loves reading, spending time with friends, and attending concerts, especially anything involving her not-so-secret obsession with Justin Timberlake and *NSYNC. She brings the same positivity, enthusiasm, and authenticity from her personal life into the care she provides every day.

Call for a Consultation

nick weight loss before and after scottsdale weight loss center

Nick's Story

"I wish I would have come here first. We spend all our time reacting to the next great weight loss tip or program. It might work for a while, but does not last and we end up yo-yoing from one fad to the next – as we gain more weight." Read More

gina weight loss before and after scottsdale weight loss center

Lost 44.5 lbs

"I had no trouble adhering to the meals and they really helped catapult my progress! The classes were so beneficial to me because they helped change my thinking about how I viewed health, nutrition, and fitness.

I will always have my relationship with Scottsdale Weight Loss Center. They truly helped me change my life forever." Read More

lauren weight loss before and after scottsdale weight loss center

Lost 60 lbs

"Dr. Ziltzer and everyone who I have come in contact with at the Scottsdale Weight Loss office have been so encouraging and I look forward to seeing them each week. It is now a year and 2 months later since I started. I am down 60 lbs., which is the average amount a 9-year-old weighs, it is crazy to think I lost a whole person! I feel amazing, I hit my goal weight in November 2021 just before Thanksgiving. Nothing on my body hurts anymore..." Read More

chuck h weight loss before and after scottsdale weight loss center

Lost 66 lbs

"The best thing I did was call the Scottsdale Weight Loss Center. I have a lot more energy, I'm not hungry, and it feels great.

You can take it from me that this is a program that produces results. The staff is always positive, supportive, and never judgmental.

Your visits always result in positive reinforcement, no matter if you had a good week or a bad week." Read More

emily weight loss before and after scottsdale weight loss center

Lost 101 lbs

"Here I am at the lowest I have been since high school weighing in at 155lbs. I have lost 101 lbs, BMI of 39 when I started, to 21.6, and of course at body fat % of 47.1 to 26.5%. I told myself by my 30th birthday I wanted to be confident in the way I look and I owe it all to SWLC. The entire staff is so welcoming and they are rooting for you just as much as you are rooting for yourself...." Read More

Reviews

      Excellent rating  
 Based on 417 reviews 
    
  
 
 
     Trustindex verifies that the original source of the review is Google. Great place 30 lbs.and counting thank you
And now it is over 40 lbs. and counting thank you great job
     
   John J 
 2 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. Best of the best - Dr. Z !!
     
   Mar S 
 6 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. The Biltmore location is top notch! Everyone there is so very friendly, professional and makes the experience so personal and easy. Highly recommend!
     
   Sue M 
 8 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. This practice is everything you would want from a physician office. Professional and knowledgeable staff and caring providers 10 stars!!!!
     
   Lisa Y 
 14 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. Everything perfect
     
   Andi K 
 20 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. I landed at Scottsdale Weight Loss 13 years ago and lost 50 pounds….regained 10 and then lost them again, plus another 20.  It is a great program, and all the professionals are amazing and caring.
     
   Mj W 
 26 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. SWL has been a God send to me! Dr. Guzman & staff especially Lilia & Bianca! They’re so supportive & professional I have lost approx 50 pounds over the year at my own pace.
     
   Donna L 
 28 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. I cannot say enough wonderful things about Dr Robert Ziltzer! He helped me reach my ideal weight and more importantly maintain it for over 2 years. He has also helped me keep my blood pressure exactly where my internist wanted it. Dr Ziltzer is not only exceptional in weight management but also a truly gifted internet’s. His knowledge, kindness, and dedication are remarkable. I am deeply grateful for his care and recommend him whole heartedly!
     
   Merle S 
 51 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. The staff at the Phoenix office are great! My experience with Dr deGuzman has been wonderful. Miriam has always been very helpful and makes the office visits pleasant and personal. The medical assistants have always been professional and great to help meet my goals.
     
   Paula S 
 54 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. I really felt comfortable with Kristen at my initial appointment.  Everyone at the center was caring and friendly, from Bianca, at the front desk, to Lily, who is the MA.  Kristen listened to my frustrations and prior disappointments about what has not worked, and is confident that she can help me achieve my goals of weight loss.  I am looking forward and excited to see the success I will attain.
     
   Joyce K 
 61 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. Amazing staff and great program!  Feeling great!
     
   Brian H 
 65 days ago
 
 
 
 
   Trustindex verifies that the original source of the review is Google. I'd lost 20 pounds on my own and struggled to keep it off.  I decided GLP-1 meds were the next step in losing more and keeping it off.  I wanted a medical doctor supervised program and chose SWLC.

I am so very glad I did!  The team in Glendale is so supportive and kind; and when I feel discouraged, they pick me up with positive energy and input.  They really do a great job with encouragement all the time.

6 weeks in I've lost 17 pounds, and am approaching weight loss with a very new perspective.  Also knowing that when I reach my target goal, they'll be there through maintenance and beyond is encouraging as well.  Good to not feel alone on this journey.
     
   Stephanie P 
 79 days ago
 
 
 
 
 
 
  
 
 
 
   Verified by Trustindex  Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more