Functional medicine doctor consulting with patient
Premier Root-cause Medicine

Lose Weight, Get Off Medications,
and Feel Healthy Again.

We help you reset your body at the cellular level using metabolic nutrition strategies from keto to carnivore—reversing Type 2 Diabetes, reducing inflammation, supporting PCOS, improving outcomes with chronic disease and cancer—so you can finally feel in control again.

Book Now 30 Day Challenge
Root-cause Medicine Specialists
Cutting-Edge Research
25+ Years Experience
2064 Park St., Riverside, Jacksonville (904) 515-3570 Veteran Owned

About FitZone Root-cause Medicine

Clinic interior

Personalized Root-cause Medicine Approach

At FitZone Root-cause Medicine Clinic in Jacksonville, FL, we go beyond traditional medicine to address the root causes of health issues. As your Keto Doctors, we use low-carb to carnivore nutrition to reset your baseline health and restore your body's natural balance.

Metabolic nutrition from keto to carnivore

Cutting-edge immunoregenerative therapies

Metabolic reset programs tailored to your needs

Holistic approach to chronic conditions

Dr. Stephen Fitzmeyer, MD leads our Root-cause Medicine program with a focus on reversing metabolic syndrome using targeted nutrition strategies from keto to carnivore, and evidence-based lifestyle therapies. His approach helps patients improve insulin sensitivity, reduce inflammation, and achieve sustainable health improvements.

Meet Dr. Fitzmeyer

30-Day Weight Loss & Metabolic Health Challenge

Transform your health in just 30 days with our comprehensive metabolic assessment and personalized challenge program.

30-Day Transformation Challenge

Complete 30-Day Metabolic Health Package - $550

Join our 30-day challenge to reset your metabolism, lose weight, and improve your health with comprehensive testing throughout your journey.

What's Included in Your 30-Day Challenge:

EKG

FIZO Health Score Assessment

Blood Glucose & Ketone Test

Continuous Glucose Monitors (2 sensors, 15 days each)

Metabolic Health Exam

Comprehensive Physical Exam

Comprehensive Blood Work (Initial + 30-Day Follow-up)

Custom Medical, Diet & Exercise Plan

GLP-1 Medications Available

If medically appropriate, GLP-1 medications are available at an additional charge to support your weight loss journey.

Track Your 30-Day Progress:
Day 1 Assessment

Initial comprehensive testing establishes your baseline

Continuous Monitoring

2 CGM sensors provide 30 days of real-time glucose data

Day 30 Results

Follow-up testing shows your measurable progress

30-Day Challenge Benefits:

Transform your health by addressing the root causes of weight issues and metabolic dysfunction:

  • Reset insulin sensitivity and glucose regulation
  • Balance hormones affecting metabolism
  • Reduce inflammation and oxidative stress
  • Correct nutritional deficiencies
  • Improve gut health and microbiome
  • See measurable results in just 30 days
Start Your 30-Day Challenge - $550

Includes 30 days of continuous glucose monitoring + comprehensive metabolic testing

Meet Our Doctor

Root-cause Medicine Specialist

Dr. Stephen Fitzmeyer

25+ Years Experience

Helping patients achieve optimal health

Dr. Stephen Fitzmeyer, MD

Specialist in Clinical Informatics, Root-cause Medicine, and Lifestyle Medicine, Dr. Fitzmeyer brings a unique perspective to patient care with expertise in metabolic nutrition from keto to carnivore approaches.

Education: Harvard University, Cambridge, MA

Training:
- Boston University Medical Center Post-doc Fellow in Clinical Informatics
- Boston Veterans Administration Post-doc Fellow in Advanced Medical Informatics

Research: Published 50+ papers on metabolic health

Membership:
- Member, American Medical Informatics Association

Certification:
- Diplomat, American College of Lifestyle Medicine
- Board Eligible in Clinical Informatics

Innovation: Founder and Creator of FIZO Health Score, a breakthrough metabolic health assessment tool

Licensure: Florida Licensed Physician

Philosophy: "Treat the root cause, not just the symptoms. Reset your baseline health with metabolic nutrition from keto to carnivore."

Schedule with Dr. Fitzmeyer

Your Keto & Carnivore Doctors

Move beyond generic diet plans with our science-based nutritional therapy that's customized to your unique biochemistry, genetics, and health goals using metabolic nutrition from keto to carnivore.

Our Metabolic Nutrition Approach:

Keto to Carnivore Spectrum

Personalized approach from low-carb to carnivore based on your metabolic needs

Metabolic Reset

Reset insulin sensitivity and cellular function through targeted nutrition

Baseline Health Restoration

Help your body return to its natural metabolic state

Start Your 30-Day Challenge - $550

Conditions We Address Through Metabolic Nutrition:

Insulin Resistance & Diabetes

Autoimmune conditions

Metabolic syndrome

Food sensitivities

Weight management

Chronic inflammation

Cardiovascular health

Neurological conditions