2064 Park St., Riverside, Jacksonville (904) 515-3570
Veteran Owned
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 3-Month Metabolic Reset
Root-cause Medicine Specialists
Cutting-Edge Research
25+ Years Experience
Our Medical Philosophy

Root-Cause First, Medications as Support

Diet as Primary Medicine

We treat root causes using metabolic nutrition—from keto to carnivore—to reset your hormones, improve insulin sensitivity, and restore natural metabolic function.

GLP-1 Medications: Temporary Support

For patients who need additional support, GLP-1 medications are available when medically appropriate. However, our goal is always to optimize your metabolic health through nutrition and lifestyle so we can reduce or eliminate medication dependence as quickly as possible.

Our ultimate goal: Get you to optimal health without long-term medication dependence.

3-Month Medically Supervised Weight Loss & Metabolic Reset

A comprehensive doctor-supervised metabolic transformation program designed to reset your hormones, improve insulin sensitivity, reduce inflammation, and achieve sustainable weight loss — safely and scientifically.

3-Month Medical Reset Program

Complete Metabolic Reset Program – $1,500

This physician-led program combines advanced metabolic testing, continuous monitoring, personalized nutrition, and medical supervision to permanently shift your metabolism from sugar-burning to fat-burning.

What’s Included in Your 3-Month Program:

Full Metabolic Health Exam

FIZO Health Score Assessment (Baseline + 90 days)

Blood Glucose & Ketone Testing

Continuous Glucose Monitor (CGM) – 3 months total

Monthly Doctor Visits (3 total)

Comprehensive Blood Work (Baseline + 3 months)

Personalized Nutrition Plan (Keto → Carnivore spectrum)

Hormone & Metabolic Regulation Guidance

Optional: GLP-1 Medications

Available if medically appropriate (additional cost). The program focuses primarily on metabolic reset without dependency on medications.

Program Benefits

  • Reverse insulin resistance
  • Reset metabolic hormones
  • Lower inflammation & improve energy
  • Improve gut & mitochondrial function
  • Sustainable fat-burning metabolism
  • Doctor-guided accountability
Start Your 3-Month Metabolic Reset – $1,500

Includes full 90-day medical supervision, CGM monitoring, and comprehensive labs.

Our Medical Process: From Assessment to Results

We provide comprehensive medical supervision with regular check-ins to ensure you're constantly motivated, monitored, and making progress toward your health goals.

1

Initial Comprehensive Evaluation

  • Full Physical Exam: Comprehensive assessment of your current health status
  • Medical History Review: Detailed analysis of your health background and concerns
  • Comprehensive Blood Work: Advanced metabolic panels to identify root causes
  • Baseline Assessment: FIZO Health Score and metabolic markers
2

Personalized Treatment Plan

  • Root-Cause Analysis: Identify underlying metabolic issues
  • Customized Nutrition Plan: Keto to carnivore spectrum based on your needs
  • Goal Setting: Clear, measurable health objectives
  • Therapeutic Protocol: Targeted supplements and interventions if needed
3

Ongoing Monitoring & Support

  • Regular Check-Ins: Scheduled visits every 2-4 weeks
  • Continuous Monitoring: CGM tracking and regular blood work
  • Constant Motivation: Doctor-guided accountability and encouragement
  • Progress Tracking: Regular updates to your FIZO Health Score

Why Our Monitoring Makes the Difference

Most programs leave you on your own after the initial visit. We're different. With check-ins every 2-4 weeks, continuous glucose monitoring, and regular lab work, you'll have the medical supervision and motivation needed to achieve lasting results. We're with you every step of the way.

Start Your Journey

Conditions We Address

Our root-cause medicine program can help alleviate or cure the following conditions. Even when complete cure isn't possible, we optimize your health so that treatments have a better chance of working effectively.

Cardiovascular Health

  • Cardiovascular Risk (CAC)
  • Hypertension (high blood pressure)
  • High cholesterol

Brain & Mental Health

  • Brain Energy & Mental Health

Cancer & Metabolic

  • Cancer & Metabolic Oncology

Metabolic Health

  • Diabetes & Metabolic Health
  • Type 2 diabetes & prediabetes
  • Weight management
  • Gout

Hormone Health

  • Hormone Therapy
  • Thyroid disorders

Women's Health

  • PCOS & Women's Health

Sleep Health

  • Sleep apnea

Anti-Aging & Skin

  • Anti-Aging & Skin Health

Our Root-Cause Approach

We don't just treat symptoms—we identify and address the underlying causes of your health issues. Through metabolic nutrition strategies from keto to carnivore, we help reset your body at the cellular level, reduce inflammation, improve insulin sensitivity, and optimize your overall health for better treatment outcomes.

Start Your Health Journey

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

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 3-Month Metabolic Reset – $1,500

Conditions We Address Through Metabolic Nutrition:

Insulin Resistance & Diabetes

Autoimmune conditions

Metabolic syndrome

Food sensitivities

Weight management

Chronic inflammation

Cardiovascular health

Neurological conditions