Dr. Kara Fitzgerald

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United States
Sandy Hook, CT
Dr. Kara Fitzgerald

Actively engaged in award-winning clinical research on epigenetics & longevity. IFM Faculty & renowned international speaker.

Director of New Frontiers Functional Medicine & Nutrition Clinic. Subscribe to get latest content at www.drkarafitzgerald.com

04/05/2026

Eggs are more than a tradition this time of year; they’re a true nutritional powerhouse.

Rich in high-quality protein, eggs provide all essential amino acids your body needs for repair and resilience.
But what makes them especially interesting from a functional medicine perspective:

• Choline → critical for brain health + methylation
• Lutein + zeaxanthin → support eye and cognitive function
• B vitamins → key for energy metabolism
• Healthy fats → help stabilize blood sugar

It’s a simple food with complex benefits, supporting everything from cellular energy to long-term brain health.

Follow for more evidence-based nutrition that supports how you feel now—and how you age later. 🥚✨

04/04/2026

Creatine is one of the most studied supplements in medicine…
yet it’s still one of the most misunderstood.

👉 Creatine does not harm kidney function in healthy individuals

So why the confusion?

Creatine can increase creatinine levels on lab work, but creatinine is a byproduct of metabolism, not a direct marker of kidney damage.

Meanwhile, the benefits go far beyond muscle:
• brain energy + cognitive support
• strength + recovery
• metabolic health
• healthy aging

Side effects? Generally mild:
• water retention (especially with loading)
• occasional GI discomfort at higher doses

That’s it.

Creatine isn’t just for athletes; it’s one of the most well-researched tools we have for supporting bioenergetics and longevity.

I break down safety, dosing, and who should (and shouldn’t) use it in the full article.

Comment CREATINE SAFE and I’ll send it to you or head to
https://www.drkarafitzgerald.com/2026/03/20/creatine-safety-side-effects-functional-medicine/ for the full article.

04/03/2026

Many clinicians are seeing this more and more in practice.
Patients who react to everything.
Fiber intolerance.
Highly restricted diets.
Digestive symptoms triggered by foods that should be supportive.

Our job often becomes helping people expand their diets again—restoring tolerance so they can eat normally, enjoy meals with others, and stop organizing their lives around avoiding food triggers.

But why is this happening?

In my latest episode of New Frontiers in Functional Medicine, I sat down with Colleen Cutcliffe, PhD, CEO and co-founder of Pendulum Life, to explore how microbial depletion and ecosystem disruption in the gut microbiome may contribute to this “tough gut” phenomenon.

We discuss:
• why some patients struggle to tolerate fiber
• the role of microbial diversity in diet tolerance
• next-generation microbiome therapeutics
• strategies to rebuild gut resilience

This is a fascinating and rapidly evolving area of functional medicine.

Comment TOUGH GUT and we’ll DM you the link or head to https://www.drkarafitzgerald.com/2026/03/24/rebuilding-gut-resilience-microbiome/ for the full episode!

04/02/2026

Stress isn’t just mental. It’s biological. 🧠🧬

Chronic stress impacts:
• Cortisol rhythms
• Inflammation
• Blood sugar
• Sleep
• Epigenetic aging

Over time, it reshapes physiology and drives disease risk.

In functional medicine, stress regulation is foundational care. Not optional.

Support resilience with:
✨ Nervous system regulation
✨ Sleep optimization
✨ Blood sugar balance
✨ Polyphenol-rich nutrition
✨ Key nutrients (like magnesium)

Stress is inevitable. How your biology responds is not.

How are you supporting stress resilience right now? 👇

04/01/2026

Infrared sauna therapy is emerging as a meaningful way to support core aging pathways, from improved vascular function and reduced inflammation to enhanced mitochondrial resilience and heat shock protein activation.

In fact, frequent sauna use has been associated with up to a 40% reduction in all-cause mortality.

This isn’t just relaxation. It’s hormesis, a controlled stressor that activates protective biology.

When used consistently and layered with nutrition, movement, sleep, and stress regulation, sauna therapy can become a valuable part of a longevity strategy.

We break down the science, mechanisms, and how to use it in the full article.

Comment INFRARED SAUNA and we’ll DM you the link, or head to https://www.drkarafitzgerald.com/2026/03/12/infrared-sauna-longevity-benefits/ for the full blog.

03/31/2026

We may need to refine how we think about Alzheimer’s risk. 🧠

For years, APOE has been central to the Alzheimer’s conversation, with APOE4 driving increased risk and APOE2 offering some protection.

But new research suggests something more nuanced:
👉 APOE3, long considered “neutral,” may not be entirely biologically inactive
👉 Genetic influence on Alzheimer’s risk may be greater than previously modeled in certain contexts

This doesn’t mean Alzheimer’s is purely genetic. But it does suggest that APOE biology may play a more central role than we once thought.

At the same time, this opens new doors:
🧬 Targeting APOE-related pathways
🧠 Intervening earlier in lipid metabolism and neuroinflammation
🔬 More personalized prevention strategies

Here’s what matters clinically:
Even within a genetically influenced model, expression is still dynamic.

APOE impacts:
• neuroinflammation
• lipid transport in the brain
• oxidative stress
• synaptic function
All of which are modifiable through lifestyle and targeted interventions.

The future of Alzheimer’s care isn’t genetic or lifestyle.
It’s both.

📚 Source: https://doi.org/10.1038/s44400-025-00045-9

03/30/2026

Things I’ll never do as a doctor who studies aging. 🧬

Sleep, nutrition, stress regulation, and the microbiome all influence inflammation, metabolism, immune function, and gene expression. When we support these foundational systems, we support the biology that allows us to age with resilience.

Healthy aging isn’t built through extremes.

It’s built through consistent biological support.

03/29/2026

When we talk about longevity, most people think about lifespan.

But what matters most is healthspan.

Healthspan is the number of years we remain:
• cognitively sharp
• physically strong
• metabolically resilient
• socially engaged
• independent

The science of longevity increasingly shows that many chronic diseases begin decades before diagnosis.

That means the work of protecting function also needs to begin early.

Small daily inputs compound over time.
• Nutrition
• Movement
• Sleep
• Stress regulation
• Community

Longevity isn’t built in a moment.

It’s built across decades.

03/28/2026

If I had to design a meal to support metabolic health, brain resilience, and healthy aging, it would look a lot like this. This salmon quinoa salad is a simple example of how food can deliver powerful biological signals.

Here’s what’s happening under the surface:

🐟 Wild salmon
Rich in EPA and DHA, omega-3 fatty acids that support brain health, inflammation balance, and cardiovascular function.
🌾 Quinoa
Provides fiber, plant protein, and minerals that support metabolic health and stable blood sugar.
🥬 Leafy greens + vegetables
Polyphenols and phytonutrients help regulate oxidative stress and cellular signaling pathways linked to aging.
🫒 Healthy fats
Support nutrient absorption and help keep blood sugar stable.

Meals like this help activate many of the systems we care about in functional medicine:
• metabolic flexibility
• inflammation balance
• mitochondrial support
• cardiometabolic health

Comment QUINOA SALAD and we’ll DM you the link, or head to https://www.drkarafitzgerald.com/recipe/salmon-quinoa-salad/ for the full recipe!

Save this for your next longevity-friendly meal.

03/27/2026

Infrared sauna therapy is often discussed as a relaxation or detox practice. But emerging research suggests that heat exposure may influence several biological pathways relevant to longevity.

Regular sauna use has been associated with improvements in cardiovascular health, metabolic resilience, and overall mortality risk in population studies. Mechanistically, heat exposure may activate hormetic stress responses, support mitochondrial function, and enhance circulation and detoxification pathways.

In a new article on the blog with Sunlighten Saunas, I take a closer look at the science behind infrared sauna and longevity, including:
• How heat activates hormesis
• The potential cardiovascular benefits of sauna therapy
• Mechanisms related to mitochondrial health and circulation
• Why sauna may support overall resilience as we age

If you’re interested in the biology of heat exposure and what the research actually shows, I think you’ll find this deep dive helpful.

🔗 Comment INFRARED SAUNA and we’ll DM you the link, or head to https://www.drkarafitzgerald.com/2026/03/12/infrared-sauna-longevity-benefits/ for the full blog.

03/26/2026

1️⃣ Food is information.
What you eat literally communicates with your genes.

2️⃣Chronic stress accelerates biological aging.
Stress regulation isn’t optional—it’s longevity medicine.

3️⃣The gut microbiome influences nearly every system in the body.
Brain, immunity, metabolism, bone health—it’s all connected.

4️⃣Polyphenol-rich plants are some of the most powerful longevity tools we have.

5️⃣Sleep is one of the most potent regenerative therapies available.

6️⃣Chronic disease doesn’t begin at diagnosis.
The biology has been shifting for years.

7️⃣Genetic risk is not genetic destiny.
Lifestyle and environment shape gene expression.

8️⃣Small daily inputs compound into massive health outcomes over decades.

Longevity isn’t built through extremes.

It’s built through consistent biological support.

03/25/2026

Food isn’t just fuel. It’s biological information.

What you eat influences:
🧬 gene expression
🔥 inflammation
🦠 your microbiome
⚡ mitochondrial energy
🧠 brain aging

That’s why nutrition remains one of the most powerful tools in functional medicine.

This National Nutrition Month, don’t ask “What diet should I follow?”

Ask:
“What signals am I sending my biology every day?”

Small inputs. Powerful outcomes.

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Sandy Hook, CT

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+12033049502

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http://www.drkarafitzgerald.com/

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