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Dr. Ethan Lazarus: Medical Weight Loss Doctor Serving Denver & Greenwood Village
National Authority on Obesity Medicine & GLP-1 Therapy (Semaglutide & Tirzepatide)
It’s About Biology, Not Willpower. And I’m Here to Help.
If you have felt frustrated by yo-yo diets or constant “food noise,” you are not alone. As a dedicated weight loss doctor serving Denver, Centennial, and Highlands Ranch, my life’s work has been proving that obesity is a complex disease driven by biology, not a lack of character. As a Denver native and father of three, I understand the lifestyle challenges my patients face in Colorado. When I’m not in the clinic helping patients, you can usually find me skiing, running, or playing the cello.
I am a double board-certified specialist in Obesity Medicine and Family Medicine. Unlike online-only subscription services, my practice in Greenwood Village offers personalized, face-to-face medical care. My team and I look at the whole picture—lab tests, body composition, and metabolic history—to help patients from Aurora to Lone Tree achieve sustainable results.
Expert Management of Wegovy®, Zepbound®, and Metabolic Health
As the Past President of the Obesity Medicine Association, I am committed to using the most advanced scientific tools available. My role is to serve as your medical partner, customizing a plan that may include FDA-approved anti-obesity medications such as semaglutide (Wegovy®) and tirzepatide (Zepbound®).
Why Choose a Board-Certified Weight Loss Doctor?
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Safety: We carefully monitor GLP-1 usage to manage side effects and ensure safety.
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Precision: We tailor dosages based on your unique metabolic response.
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Comprehensive Care: Medication is most effective when paired with the nutrition and behavioral support provided by our team of Weight Loss Dietitians.
Whether you are driving in from Littleton or Englewood, our goal is to provide the accountability and expertise you need to turn temporary weight loss into lifelong health.
What Our Patients Say About Dr. Lazarus | Denver’s Weight Loss Doctor
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As healthcare in our country is turning into mush, Dr. Lazarus has not. He has been a great doctor for weight management for me for over a decade. He has… read more helped me manage weight through major life changes. He is worth it.
Eva
May 27, 2026I have been so pleased with the support from this processes. It’s not just about the weightloss but about learning how to be healthy for life! Jamie and Heather have… read more been so great at guiding me as I navigate a healthy life after 50! Stacy is a great support on the nutritional side giving great nutrition ideas and yummy alternatives
Myriam
May 27, 2026They really care about your progress, they have great education tools to help you to understand obesity, and really great people work there! They are also good at taking… read more into account the costs of medications that are used and are very helpful with making things more affordable.
Paula
May 14, 2026 -
CNC quite literally changed—and may have even saved—my life. Before finding CNC, my health was at an all-time low. I was borderline diabetic, struggling with high blood pressure, eating poorly, exhausted… read more all the time, and honestly had just about given up on myself and my overall well-being. Then I found CNC and their incredible team of caring professionals who truly saw me, heard me, and helped me create a realistic plan to reclaim my health. What makes CNC so special is that their approach is not just about weight loss—it’s about helping the whole person. From day one, I felt supported, encouraged, and genuinely cared for. The consistent check-ins, guidance, accountability, and compassion have made all the difference in my journey. I’m now 10 weeks in, and I cannot believe how much better I feel. I have more energy, a renewed outlook on life, I’m more active, and for the first time in a long time, I’m eating properly and consistently. My nutrition coach MaryEllen has been absolutely amazing throughout this process, and Shelby—her sweet pup—has been an unexpected but wonderful part of the experience too! I truly cannot thank the CNC team enough for helping guide me back from the brink and reminding me that my health and happiness matter. I’m excited for the next 10 weeks and beyond! If you are struggling with your health, nutrition, weight, or simply need support getting back on track, I cannot recommend CNC enough. They genuinely care and will help you build a healthier, happier version of yourself.
Cate
May 9, 2026 -
Dr. Lazarus is so knowledgeable in obesity medicine and is up to date on all the new studies, medicines, treatments. He is easy to talk to and suggests the… read more best course of action. I would highly recommend him and his team.
Laura
May 7, 2026The CNC is great. People are supportive and knowledgable. I have been involved with CNC for 20+ years. I thank god for Dr. Lazarus and his entire staff. Weight management… read more is a constant, but these people make it much easier and safer.
Allan
May 6, 2026I am a long term patient of Clinical Nutrition Center with Dr. Lazarus. This is the very first time in my life (75yrs old) that I have kept the weight… read more off in over 10 years. They really take the needs of their patients seriously and understand the struggles of being overweight. AND!!! my health and blood work have been the best ever! It is totally worth your time and attention to this practice.
Marcia
May 6, 2026 -
Amazing practice. They have been with me every step through the ups and downs. I was never able to lose weight until I came here. Couldn’t recommend enough.
Nicola
May 1, 2026 -
Dr Lazarus and his team at CNC is a wonderful group. Everyone is very friendly and welcoming. Dr Lazarus is a very brilliant man and has helped me with his… read more guidance over the years. I would highly recommend coming to see this team of professionals.
Sheila
February 13, 2026Stacey is excellent especially making sure ingredients are healthy. Heather and Dr Lazarus are wonderful. Highly recommend
Kimberly
January 20, 2026The Medical staff are highly trained professionals and extremely knowledgeable. They take their time and listen to you and consider all factors. They explain options available to you very… read more well along with the pros and cons. They are wonderful with follow up and support. I can’t say enough about this Clinic.
Sandy
January 8, 2026 -
The Medical staff are highly trained professionals and extremely knowledgeable. They take their time and listen to you and consider all factors. They explain options available to you very… read more well along with the pros and cons. They are wonderful with follow up and support. I can’t say enough about this Clinic.
Sandy
January 8, 2026Everyone who works here is invested in my weight loss. For any struggle I’m having they have a suggestion that helps me turn it around. I’ve tried every weight loss… read more plan you can imagine from WW (seriously at least 20 times ) keto, shakes, intermittent fasting, you name it. I’m 72 so been around for all the fads. They’ve been doing this a long time and keep up with current trends and science. It’s a medical weight loss clinic. Yes, I’m paying for their services and it’s worth every penny. For the first time I feel that I can do this and am doing it.
Julie
December 23, 2025I feel blessed to have found Dr. Ethan Lazarus, medical obesity specialist, and Mary Ellen, nutritionist, at CNC. The support, knowledge, communication and commitment to the patient far surpasses my… read more experience in any other medical setting. They guided my through two successful joint replacements while maintaining a stable weight and continued good health. I highly recommend this practice to anyone who chooses to improve their health and well being.
Larry
December 10, 2025 -
I feel blessed to have found Dr. Ethan Lazarus, medical obesity specialist, and Mary Ellen, nutritionist, at CNC. The support, knowledge, communication and commitment to the patient far surpasses my… read more experience in any other medical setting. They guided my through two successful joint replacements while maintaining a stable weight and continued good health. I highly recommend this practice to anyone who chooses to improve their health and well being.
Larry
December 10, 2025 -
Betsy
October 24, 2025 -
I hate how long it took me to find out about this place. I’ve been working with Stacy Gill (Nutritionist) and Jamie Shriver (PA) and they are both incredible. I… read more feel more informed and supported than ever. I’ve already recommended this place to all of my friends!
Jocelyn
October 23, 2025Mary
October 21, 2025
My Commitment to You
My mission is to provide the highest level of care in the field of obesity medicine. Whether you need to lose 20 pounds or more than 100, I am committed to using every evidence-based tool available to help you improve your health, feel better, and rediscover a zest for life. You don’t have to do this alone.
Curriculum Vitae (CV)
Dr. Lazarus in the news
New York Times
Wall Street Journal
AMA
Endocrine Society
VeryWell MD
Life After (Weight) Loss: With significant weight loss comes complicated feelings
Hone
Medscape
AARP
AARP updated their statement on spotting weight loss scams. Read more here.
Medical Economics
Bariatric Times
Health Monitor
Everyday Health
Journey Talk Live
PWN Health
Are you ready to take the next step?
Your journey to lasting health starts with a simple conversation. Let’s work together to create a customized plan that finally works for you.
*Your free visit can be with one of our Providers or Registered Dietitians. We will answer all of your questions, explain our programs and fees, and figure out if this is a good fit. This can be done in-person, or by phone or video. There are no obligations for this visit. This free visit is only for potential new patients. We are only able to provide care within Colorado.
A National Leader in Medical Weight Loss
- 20+ Years Experience: Serving the Colorado community as a specialized Weight Loss Doctor.
- National Leadership: Past President of the Obesity Medicine Association (OMA), the nation’s largest society of clinicians dedicated to treating obesity.
- Thought Leader: Nationally recognized speaker on the efficacy of GLP-1 medications and metabolic health.
- Local Impact: Helping thousands of patients in the Denver Metro area reclaim their health.
Credentials, Research & Publications
- American Board of Family Medicine: Since 1999
- American Board of Obesity Medicine: Since 2012 (first year offered)
- Undergraduate: University of Pennsylvania and the Wharton School
- MD: University of Colorado Health Sciences Center
- Residency: Family Medicine, John Peter Smith hospital, Ft. Worth, Texas
- Physician and Owner of Clinical Nutrition Center since 2004, a privately owned medical practice
- President (2021 – 2022) for the Obesity Medicine Association, a society with over 5,000 physicians and other healthcare providers treating obesity
- Past-President (2022 – 2024) for the Obesity Medicine Association
- Secretary-treasurer, Vice-President, President-Elect, Board of Trustees (2014 – 2021) for the Obesity Medicine Association
- Diplomate: American Board of Obesity Medicine
- Board Certified: American Board of Family Medicine
- Specializes in medical weight loss
- Delegate in the American Medical Association
- Healthcare Advocate of the Year. Obesity Action Coalition. November 2018.
- Obesity Medicine Clinician of the Year. Obesity Medicine Association. October 2015.
- Peter G. Lindner Award. Obesity Medicine Association. October 2018.
- Vernon B. Astler Award. October 2013.
New York Times
Few Signs of a Taste for Diet Pills
AMA:
What doctors wish patients knew about anti-obesity medication | American Medical Association
With U.S. obesity rate over 40%, 3 treatment keys for doctors
Person-first, preventive approach needed to tackle obesity
WebMD
Life After Ozempic: What Comes Next
Biggest Weight Gain Now Comes Early in Adulthood
VeryWell MD
Life After (Weight) Loss: With significant weight loss comes complicated feelings
Hone
Wegovy vs Phentermine: Which Is Better for Weight Loss?: It comes down to results, side effects, and affordability.
My Phentermine Stopped Working—Now What?
Medscape
Obesity Medications: Who Needs Priority Access
Launching an Obesity Medicine Practice? Key Considerations
Hanging in the Balance: Reports Aim to Propel Obesity Care Forward
AARP
AARP updated their statement on spotting weight loss scams. Read more here.
Bloomberg
Medical Economics
As this year comes to a close, it offers clinicians a chance to reflect on the current state of obesity medicine and look ahead to what’s next. The COVID-19 crisis will still be top of mind forcing our field to continue to adapt — this will be particularly true for our colleagues involved in obesity treatment. Click here to read more.
Bariatric Times
The culmination of another year offers clinicians a chance to reflect on the current state of obesity medicine and look ahead to the developments on the horizon. Certainly, we can expect our field to continue reacting and responding to the COVID-19 crisis — and this will be particularly true for our colleagues who practice bariatric surgery. Patients with obesity are at a significantly higher risk of adverse health outcomes as a result of COVID-19, and these dedicated healthcare professionals play a vital role in helping to stem one of our country’s most pressing public health concerns. Click here to read more.
Health Monitor
Overcoming medical barriers to weight loss
Prevention
What 10 Obesity Experts Wish You Knew About Weight Loss.
Endocrine Society
Liquid Meal Replacements: Better Than Other Weight Loss Options?
Everyday Health
Why Calling Obesity a Disease Is a Good Thing
Journey Talk Live
Dr. Lazarus was the featured guest on Journey Talk Live, a show hosted by Dr. Nick Slenkovich. Dr. Slenkovich is a plastic surgeon in Highlands Ranch, Colorado. This interview explores the ins and outs of medical weight loss. You can watch the interview on Facebook Now.
Wall Street Journal
Overcoming Misconceptions About Diabetes
PWN Health
Rhythm Pharmaceuticals to offer free genetic testing for rare forms of genetic obesity. Click here to read more.
Personal Information
- Born: Denver, Colorado, raised in Greenwood Village, practiced family medicine in Littleton, and now lives in Lone Tree!
- Married with 3 children
- Enjoys biking, running and skiing
- Accomplished musician – cellist, pianist, composer. Click here for more info…
- Obesity Pillars:
- Appropriate use of the fixed-dose, extended-release combination of naltrexone and bupropion as treatment for obesity in primary care
- OMA President’s perspective: A new journal will help us overcome obesity
- Obesity pillars roundtable: Phentermine – Past, present, and future
- Cancer and Obesity: An Obesity Medicine Association (OMA) Clinical Practice Statement (CPS) 2022
- Future of Obesity Medicine: Fearless 5-year predictions for 2028
- Book Chapters
Latest Clinical Insights from Dr. Lazarus
As a leader in obesity medicine, Dr. Lazarus regularly reviews new clinical data on GLP-1 therapies and metabolic health. View his recent articles below:

GLP-1 Medications and Cancer Risk: What a New Study Shows
GLP-1 Medications and Cancer Risk: What a New Study Shows Published May 26, 2026 | Dr. Ethan Lazarus, MD A new study…

Protein on GLP-1s: How to Eat to Preserve Muscle and Keep Losing Fat | Denver
A patient came in last month frustrated. She’d been on a GLP-1 medication for four months, had lost 18 pounds — and…

Why Your GLP-1 Might Not Be Working — and What a Medical Team Can Actually Do About It
For years, the standard answer was: eat less, move more. If that didn’t work, you didn’t try hard enough. We know better…

5 GLP-1 Mistakes Patients Make (And How to Avoid Them)
If you’re on a GLP-1 medication—or thinking about starting one—you owe it to yourself to get this right. These drugs work. But…

Survodutide Phase 3: 16.6% Weight Loss in Adults with Obesity
New Phase 3 Data: Survodutide Delivers 16.6% Weight Loss — Dual GLP-1/Glucagon Agonist Shows Metabolic Benefits Beyond the Scale The SYNCHRONIZE-1 Phase…

Amazon’s GLP-1 Program: Is Convenience Enough?
Amazon just entered the weight loss drug business. And if you’ve been watching the GLP-1 space, you probably saw it coming. On…
Dr. Lazarus works alongside our registered dietitians — Stacy Gill, RDN and Mary Ellen Doukakis, RDN — to provide comprehensive, physician-supervised weight loss that combines medication, nutrition, and lifestyle support. Learn about our dietitian services →
