For same day appointments, call (904) 515-3570 to check for openings — No Walk-Ins
2064 Park St., Riverside, Jacksonville (904) 515-3570 Veteran Owned
By appointment only — no walk-ins Book $50 Consult

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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.

Private Consultation Our Approach
Root-cause Medicine Specialists
Cutting-Edge Research
25+ Years Experience

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

Our Specialized Services

We offer innovative treatments designed to optimize your health and vitality through root-cause medicine.

Immunoregenerative Medicine

Advanced therapies to regenerate and strengthen your immune system, helping your body heal naturally from within.

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Metabolic Reset

Personalized programs using keto to carnivore nutrition to reset your metabolism, optimize energy levels, and achieve sustainable weight management.

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Hormone Optimization

Comprehensive hormone evaluation and balancing to restore vitality, improve mood, and enhance overall wellbeing.

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Neurocognitive Enhancement

Specialized protocols to improve brain function, memory, focus, and protect against cognitive decline.

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Nutritional Therapy

Customized nutritional plans from keto to carnivore based on your unique biochemistry to support healing and optimal function.

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Mitochondria Repair

Innovative protocols to restore mitochondrial function, boost cellular energy, and reverse signs of aging.

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DOT Physicals - $50

Professional DOT physical exams for commercial drivers. Get certified quickly and affordably with our certified medical examiner.

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Diabetes Reversal

Targeted lifestyle therapies designed to lower A1C, improve insulin sensitivity, and reduce or eliminate dependence on medication.

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Metabolic Cancer Support

Nutrition-focused interventions to reduce inflammation and support mitochondrial health during cancer care and recovery.

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PCOS & Hormonal Balance

A root-cause approach to managing PCOS with nutrition, insulin control, and natural hormone optimization strategies.

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FitZone Clinic Pricing

$200 Initial Consultation

90-Minute Comprehensive Evaluation

  • ✅ In-depth review of your health history, symptoms, and goals
  • ✅ Analysis of any previous lab results you bring
  • ✅ Personalized dietary, lifestyle, and supplement recommendations
  • ✅ Outline of recommended root-cause lab testing through Rupa Health
Schedule Consultation

$125 Follow-Up Visit (Includes Labs)

4-Week Progress Evaluation

  • ✅ Repeat core lab panel through Rupa Health (included)
  • ✅ Review of progress since your initial visit
  • ✅ Updated treatment, nutrition, and supplement plan
  • ✅ Guidance on next steps toward metabolic health goals
Book Follow-Up

All visits by appointment only • Labs drawn through Rupa Health partner facilities.

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 Fellow in Clinical Informatics
- Boston Veterans Administration Fellows 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 Metabolic Reset

Conditions We Address Through Metabolic Nutrition:

Insulin Resistance & Diabetes

Autoimmune conditions

Metabolic syndrome

Food sensitivities

Weight management

Chronic inflammation

Cardiovascular health

Neurological conditions