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Dr. Kara Fitzgerald
Individualized Evidence Based Integrative & Functional Medicine
Dr. Kara Fitzgerald Dr. Kara Fitzgerald
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  • About
    • Dr. Kara Fitzgerald
    • Our Team
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  • Learn
    • Newsletter
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    • REPORT: The Use of AI & Wearables in Functional & Longevity Medicine
  • Contact
  • YOUNGER YOU
    • Practitioner Training
    • What is Younger You
    • Books
      • Younger You book
      • Better Broths book
    • Discover Your Bio Age
      • Bio Age Quiz (BASA) – FREE
      • Bio Age Lab Test
    • Programs
      • 10-Day Self-Paced Course
      • 1-1 Clinic Support
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Karen Frank, CPC, our Sandy Hook Billings Manager is responsible for the timely and accurate preparation and distribution of customer invoices for the company and its subsidiaries. In addition, her department handles special invoicing as some joint-venture related invoicing.

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KARA FITZGERALD, ND
DR. KARA FITZGERALD, LLC
KF EDUCATION & CONSULTING, LLC

The New Frontiers Functional Medicine & Nutrition Clinic is located in the Sandy Hook Village section of Newtown, Connecticut in Fairfield County, Connecticut.
  • Phone:
    (203) 304-9502
  • Fax:
    (203) 304-9503
  • Address:
    27 Glen Road, Sandy Hook CT 06482

Find us on:

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IFM Certified Practitioner

Kara Fitzgerald, ND, Naturopathic Doctor is a certfied practitioner with The Institute for Functional Medicine.

functionalmedicine
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drkarafitzgerald

Every cell is constantly making a decision: Renew Every cell is constantly making a decision: Renew or accumulate damage.

That decision is governed by energy sensing and mitochondrial quality control.

When cellular energy systems are intact, repair pathways activate.

Damaged components are cleared.
Resilience is preserved.

When mitochondrial function declines, renewal slows.
Dysfunction accumulates.
Biological aging accelerates.

Longevity is not just about producing more energy.

It’s about maintaining the systems that renew it.

Want to stay current on the latest in FxMed? Comment NEWSLETTER and get the link to be added to our email list.
The USDA released new dietary guidelines. But do The USDA released new dietary guidelines.

But do they actually reflect what we know about metabolic health?

On the latest episode of the New Frontiers in Functional Medicine, I sit down with @robertlustigmd to unpack what the guidelines get right and where they fall short.

We talk about:
 • Why sugar and ultra-processed foods still aren’t addressed with enough clarity
 • Where nuance around fats and protein is missing
 • Why dietary advice alone rarely moves the needle on obesity, diabetes, or cardiometabolic disease
 • And how policy, food environments, and biology all intersect in ways guidelines often ignore

If you’re trying to make sense of nutrition guidance, clinically or personally, this episode offers a clearer, more metabolically informed framework for thinking about food, health, and the systems shaping both.

🎧 Comment FOOD PYRAMID and we’ll DM you the link, or head to https://www.drkarafitzgerald.com/2026/03/10/robert-lustig-usda-guidelines/ to listen to the full podcast

#FunctionalMedicine #MetabolicHealth #NutritionPolicy #UltraProcessedFoods #SystemsBiology #LongevityMedicine #PublicHealth #DrKaraFitzgerald
Creatine is having a clinical renaissance, and it Creatine is having a clinical renaissance, and it goes far beyond muscle.

Emerging research shows creatine supports some of the most fundamental processes in human physiology, including cellular energy production, mitochondrial function, brain health, and metabolic resilience.

It works by helping regenerate ATP, the core energy currency every cell depends on. This makes creatine especially relevant for high-demand tissues like muscle, brain, and heart.

New human studies suggest creatine may help support:

 • Cognitive function and brain energy
 • Muscle strength and healthy aging
 • Glucose metabolism and cardiometabolic health
 • Resilience during metabolic stress

This is why creatine is increasingly being recognized not just as a sports supplement, but as a foundational bioenergetic nutrient.

In our latest blog, we break down the mechanisms, clinical evidence, and what this means for health and aging.

Comment CREATINE BENEFITS and we’ll DM you the link, or head to https://www.drkarafitzgerald.com/2026/02/19/creatine-benefits-brain-health-aging/ for the full blog

#FunctionalMedicine #Creatine #Mitochondria #BrainHealth #MetabolicHealth #HealthyAging #LongevityScience #CellularHealth
Fatigue. Muscle loss. Slower recovery. These aren Fatigue. Muscle loss. Slower recovery.

These aren’t just signs of aging. They’re often signs of mitochondrial decline.

Mitochondria are central to energy production, resilience, and long-term healthspan. And one of the most exciting areas of research right now is mitophagy, the process that clears damaged mitochondria and restores cellular function.

Join me live with Dr. Anurag Singh from @timeline_longevity for a deep dive into the clinical science behind Urolithin A, the postbiotic nutrient developed by Timeline® shown in human trials to support mitochondrial quality control.

In this webinar, we’ll cover:
 • What Urolithin A is, and why most people can’t produce enough through diet
 • Why mitophagy is a critical longevity pathway
 • Key findings from human clinical trials
 • Which patients may benefit, and practical implementation considerations
If you’re interested in precision longevity strategies rooted in cellular biology, this conversation is for you.

Live attendees can join the Q&A. All registrants receive the replay.

Comment Mitophagy and we’ll DM you the link to the register, or head to https://www.drkarafitzgerald.com/2026/02/27/webinar-timeline-urolithin-a-mitochondrial-function/ to reserve your spot!
Spring Forward, Biology Pushes Back ⏰🧬 This weeke Spring Forward, Biology Pushes Back ⏰🧬

This weekend we “spring forward” and lose an hour of sleep.

It may seem minor, but even a one-hour shift in circadian timing can ripple through multiple biological systems.

Research links daylight saving time changes with temporary increases in:
 • Sleep disruption
 • Inflammation
 • Cardiovascular events
 • Mood disturbances
 • Metabolic dysregulation

From a functional medicine perspective, this isn’t surprising. Our biology runs on circadian rhythms that regulate hormones, immune signaling, metabolism, and mitochondrial function.

When sleep timing shifts abruptly, cortisol patterns, melatonin signaling, and glucose regulation can all be affected.

The good news? A few small strategies can help support the transition:
☀️ Get morning sunlight within an hour of waking
 🥗 Eat balanced meals at consistent times
 🚶‍♀️ Move your body earlier in the day
 📵 Dim lights and reduce screens in the evening
 😴 Prioritize sleep for the next several nights

Circadian health is foundational to longevity.

Even small disruptions remind us how tightly our biology is linked to the rhythms of light, sleep, and time.

#CircadianRhythm #FunctionalMedicine #LongevityMedicine #SleepHealth #MitochondrialHealth #Healthspan
This website is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician with any questions regarding a medical condition.
Dr. Kara Fitzgerald

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Dr. Kara Fitzgerald, ND

Dr. Fitzgerald is an internationally-recognized expert clinician, as well as nationally-bestselling author, who is actively engaged in clinical research on epigenetics and longevity using a diet and lifestyle intervention developed in her research and practice.

She has published two clinical studies on the potential bioage-reversing effects of an 8-week DNA methylation-supportive diet and lifestyle in middle-aged men and women in the journal Aging. She continues to lead the conversation around interventions for healthy aging and their extensive potential in improving individual and population level disease burdens, while also providing evidence-based and practical advice that cuts through the hype.

Dr. Fitzgerald is on faculty at the Institute for Functional Medicine (IFM), is an IFM Certified Practitioner, and lectures globally on functional medicine, longevity, and epigenetics to practitioners and consumers.

She maintains an award-nominated podcast series ranked in the top 1% of global podcasts by Listen Score, New Frontiers in Functional Medicine, and an active blog and Clinic Immersion webinar series through her website, www.drkarafitzgerald.com.

Follow Dr. Fitzgerald on Instagram: @drkarafitzgerald

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