Skip to content
NEWSLETTER SIGNUP
SoundCloud page opens in new windowPinterest page opens in new windowYouTube page opens in new windowInstagram page opens in new windowTwitter page opens in new windowFacebook page opens in new window
Dr. Kara Fitzgerald
Individualized Evidence Based Integrative & Functional Medicine
Dr. Kara Fitzgerald Dr. Kara Fitzgerald
  • About
    • Dr. Kara Fitzgerald
    • Our Team
    • Press
    • Publications
    • Testimonials
    • Careers
  • Learn
    • Newsletter
    • Blog
    • Podcast
    • Webinars
    • Research, News & Ideas
    • Case Studies
    • Recommended Links
    • FxMED Sponsored Education
  • Recipes
  • Store
  • Contact
  • YOUNGER YOU
    • Practitioner Training
    • What is Younger You
    • Books
      • Younger You book
      • Better Broths and Healing Tonics Book
    • Discover Your Bio Age
      • Bio Age Quiz (BASA) – FREE
    • Programs
      • 10-Day Self-Paced Course
      • 1-1 Clinic Support
      • For Businesses
    • Supplements
  • Clinic
    • Our Clinic
    • New Frontiers Clinic Services
    • FAQ
    • Testimonials
    • Office Policies and Fees
    • Contact the Clinic
    • Getting Here
    • Patient Portal
Cart0

View CartCheckout

  • No products in the cart.

Subtotal: $0.00

View CartCheckout

Search:
  • About
    • Dr. Kara Fitzgerald
    • Our Team
    • Press
    • Publications
    • Testimonials
    • Careers
  • Learn
    • Newsletter
    • Blog
    • Podcast
    • Webinars
    • Research, News & Ideas
    • Case Studies
    • Recommended Links
    • FxMED Sponsored Education
  • Recipes
  • Store
  • Contact
  • YOUNGER YOU
    • Practitioner Training
    • What is Younger You
    • Books
      • Younger You book
      • Better Broths and Healing Tonics Book
    • Discover Your Bio Age
      • Bio Age Quiz (BASA) – FREE
    • Programs
      • 10-Day Self-Paced Course
      • 1-1 Clinic Support
      • For Businesses
    • Supplements
  • Clinic
    • Our Clinic
    • New Frontiers Clinic Services
    • FAQ
    • Testimonials
    • Office Policies and Fees
    • Contact the Clinic
    • Getting Here
    • Patient Portal

Dr. Kenneth Alan Litwin MD

You are here:
  1. Home
  2. Project
  3. Dr. Kenneth Alan Litwin MD

Dr. Kenneth Litwin is an Internal Medicine Practitioner and is affiliated with Dr. Kara Fitzgerald. Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine.

Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine.Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine.Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine. Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine. Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine.Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine. Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine. Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine. Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine. Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine. Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine. Dr. Kenneth Litwin received his medical degree from Allegheny University of the Health Sciences and has been in practice for 19 years. Dr. Litwin specializes in Internal Medicine.
Category: Our TeamBy Kara Fitzgerald, NDMarch 31, 2015Leave a comment

Project navigation

PreviousPrevious project:Romilly Hodges, NutritionistNextNext project:Dr. Kara Fitzgerald
OUR SPONSORS

I am eternally grateful to our sponsors who, by blogging, podcasting and advertising with us, enable me and my team to devote energy and time to writing and publication. All the companies who sponsor us are companies that I trust for myself and my patients and use regularly in my clinical practice. Please check out their websites! – Dr. KF

DSL
Doctor's Data
TESTIMONIALS

Dr. Fitzgerald’s book is an extraordinary integration of a vast amount of diverse information that makes practical sense of the complex interplay between our genes, the folate/vitamin B12 cycle, homocysteine, and the clinical importance of methylation. 

Jeffrey Bland, PHDPresident PLMI

I was thrilled to see the principles of a methylation food plan. This helped to confirm my teaching principles.

Kylene Bogden, MS, RDN, CSSD, LDNCleveland Clinic Center for Functional Medicine

The nutrition methylation webinar has fabulous information on methylation and specific nutrients that are required to support the process. I think I can speak for our team of dietitian nutritionists in saying that it is valuable to connect the science and biochemistry from Dr. Fitzgerald’s point of view with the nutrition and implementation from Romilly. They are a knowledgeable team! I love that this is a food-first approach with an emphasis on food and dietary intervention for sustainable long-term nutritional support. Food is not just medicine, it’s information for methylation and you can’t supplement your way out of a bad diet!

Brigid Titgemeier, MS, RDN, LDCleveland Clinic Center for Functional Medicine

I enjoyed the presentation and really appreciated the food first approach. There were many talking points to help solidify this concept with patients, particularly those that don’t “buy in” to the food first approach or simply want to take a supplement.

Lindsay Malone, MS, RD, CSO, LDCleveland Clinic Center for Functional Medicine

Dr. Kara Fitzgerald always produces clinically relevant and compelling cutting-edge content in her blogs, PodCasts and newsletters and I try to never miss one. Her dept of knowledge in the functional medicine paradigm and its relevance to modifying the course of the chronic disease epidemic is not only valuable, but inspiring. She is a respected colleague and I always appreciate the effort she puts into keeping up the important dialogue between integrative and functional medicine clinicians, as well as her clear desire to educate the health care consumer in the process. Dr. David M. Brady (University of Bridgeport, Designs for Health, Inc., Diagnostic Solutions Labs, LLC, and DrDavidBrady.com)

David BradyDoctor

I want to drop you a note to tell you how much I enjoy your newsletter-Your newsletter is no doubt the best newsletter I receive. It’s not too long, not too short, yet chock full of great info, and, most importantly for the reader, enjoyable to read because your playfulness comes through. All of this separates your newsletter from the pack. You are doing a superb job, and it’s a pleasure to read! Keep it up!

Robert Hedaya, MDClinical Professor of Psychiatry

I’ve had the opportunity to review Dr. Kara Fitzgerald’s blogs. She is a well-recognized leader of functional, integrative medicine. Her blogs effervesce with her enthusiasm for her subject matter and convey her genuine warmth and compassion for her patients. She writes in an engaging style while conveying significant and meaningful information about the varied topics she has covered. They are simply fun to read and easy to learn from her wealth of experience.

Shalesh Kaushal, MD PhD

Dr. Kara’s blogs are current, scientifically sound, and relevant to clinical care. Her case studies and reviews are focused on how to improve clinical thinking and outcomes using a systems biology and functional medicine approach. They are one of my favorite learning tools and I look forward to her insights and interviews monthly!

Sarah Lobisco, NDND, IFM-CP

Dr. Fitzgerald is what you get when you merge a brilliant clinical brain with a powerful loving heart. Her ability to incorporate seemingly disparate details into a mosaic of meaning that can improve patient care is extraordinary. The opportunity to learn from her should never be missed without great reason.

David H. Haase, MDIFM-CP, FABFM, DABIHM, CNS, BCN

Kara and I have co-authored case studies for peer-reviewed articles and textbooks over the years. I love reading her blog, while evidenced-based and geared towards the professional, the casual style makes for fun reading!

Dr. Mark Hyman, MD9 Time NY Times Best Selling Author

I thoroughly enjoy reading your blog and recommend it to the medical students. It is interesting, informative and up to date as well as an excellent supplement to their text.

Albert E. Dahlberg, MD, PhDProfessor, Brown University

Dr. Kara Fitzgerald’s writing style is clear, concise, well-translated from scientific gobbledygook to understandable every language. And most importantly, it’s accurate.

Dr. Tom O’BryanFounder: The Gluten Summit

Of the myriad blogs I receive in my inbox, Kara’s is one that I actually read! It’s funny, clinically relevant and smart.

Sara Szal, MDNYT Best Selling Author, Clinician

I am a regular reader of Dr Fitzgerald’s blog/newsletter. I read it because it is useful. Dr. Fitzgerald, stimulated by a recent article, looks into the bulk of the literature and synthesizes the relevant takeaways. Dr Fitzgerald is brilliant and always delivers clinical pearls.

Tom Sult, MDIFM Faculty, Author, Clinician

Wading through emails is not an ideal part of my day. For this reason, I’m very particular about who’s information I want coming into my inbox. When I see an email come in from Dr Fitzgerald, I stop what I am doing and I read it fully right then so I don’t miss it. Her content is always interesting, clinically relevant, cutting edge and many times entertaining as well. I only wish one thing: that she’d write more!

Ben Lynch, NDExpert on MTHFR & Epigenetics

Dr. Fitzgerald has her finger on what’s happening in holistic and integrative health and medicine. I love reading her blog! It’s always right on the mark!

Liz Lipski, PhD, CCN, CNS, CHNAuthor, Lecturer, Educator

I love reading Dr Fitzgerald newsletter! It is both funny and relevant and offers great info for my patients and colleagues.

Susan Blum, MD, MPHNYT Best Selling Author

Dr. Kara Fitzgerald is a clear, brilliant, and insightful clinician. She always seems to unwrap the story of the patient so well, then identifies the pertinent imbalances and together with the patient initiates the therapeutic plan with successful treatment. She is rare in the education and clinical circles. I always learn from her blogs, conversations, case studies, and lectures. She is an outstanding educator and functional medicine physician.

P. Michael Stone, M.D., M.SCertified Functional Medicine Clinician

I am so happy to have found Dr. Fitzgerald, Romilly and Rhonda who all care about my well being. My life has changed for the better and I will continue whatever staff recommends so I can enjoy my family and feel great.

Victoria O

I wanted to find the root cause for my health concerns, to treat the primary cause and not the symptoms. Dr. Fitzgerald’s approach is radically different. She is tuned in to me. She responds to me within 24 hours. The intimacy of working with Dr. K is different than the yearly physical.

John J

Younger You Supplements

Younger You Daily Supplements are Now Here!

What could be more convenient than having your daily supplements all pre-portioned in one pouch? Choose your level to get the combination of supplements that’s right from you. Monthly subscription available.

Shop Now!

(note you’ll be leaving www.drkarafitzgerald.com to go to www.vitaboom.com to complete your purchase)

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:

Facebook page opens in new windowTwitter page opens in new windowYouTube page opens in new windowLinkedin page opens in new windowPinterest page opens in new windowInstagram page opens in new windowSoundCloud page opens in new window
IFM Certified Practitioner

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

functionalmedicine
Follow Us on Instagram

drkarafitzgerald

For decades, Alzheimer's research has focused prim For decades, Alzheimer's research has focused primarily on amyloid plaques.

But what if, in some cases, amyloid is part of the body's response, not the root problem itself?

In this fascinating conversation, @drrichardhorowitz explores emerging research on the relationship between chronic infections, neuroinflammation, and cognitive decline. He discusses a published case in which treatment targeting chronic Lyme disease was associated with improvements in cognition, amyloid biomarkers, and a substantial reduction in pTau-217.

Importantly, this doesn't mean Alzheimer's disease is caused by Lyme disease.

What it does suggest is that we may need to ask bigger questions.

Could chronic infections, immune dysregulation, environmental exposures, mitochondrial dysfunction, or other inflammatory triggers be contributing to neurodegeneration in some individuals?

If we focus only on symptoms or downstream biomarkers, we may miss opportunities to identify and address the upstream drivers of disease.

This is the systems biology lens: looking beyond a diagnosis to understand what may be fueling dysfunction in the first place.
The future of brain health may depend on asking better questions.
Comment LYME and we'll send you the full podcast.
#AlzheimersDisease #BrainHealth #Neuroinflammation #FunctionalMedicine #LymeDisease #CognitiveHealth #HealthyAging #PrecisionMedicine #RootCauseMedicine #SystemsBiology #LongevityMedicine
For years, chronic illness has often been approach For years, chronic illness has often been approached as though there must be a single root cause. But what if we're asking the wrong question?

What if many chronic conditions are better understood as a web of interacting factors - environmental exposures, infections, immune dysfunction, gut health imbalances, trauma, mitochondrial dysfunction, and yes, in some cases, mold toxins?

According to Dr. Horowitz, mold and mycotoxins may do more than cause symptoms on their own. They can suppress immune function, amplify inflammation, contribute to brain fog and fatigue, reactivate latent infections, and interfere with treatment response.

This doesn't mean mold is the answer for everyone. It does suggest that when symptoms are persistent and complex, we may need a broader lens.

The future of medicine isn't about looking for one thing.

It's about understanding how multiple systems interact—and where the biggest opportunities for healing may exist.

Comment LYME and we’ll DM you a link to the full podcast episode.

Have you ever explored environmental factors as part of your health journey? Let me know below. ⬇️

#FunctionalMedicine #EnvironmentalMedicine #MoldIllness #ChronicIllness #IntegrativeMedicine #RootCauseMedicine #BrainHealth #Inflammation #MitochondrialHealth
Creatine is one of the most researched supplements Creatine is one of the most researched supplements in the world.
And still one of the most misunderstood.

For years, concerns about kidney damage, hair loss, bloating, dehydration, and “unsafe long-term use” have overshadowed what the science actually says.

So let’s clear a few things up.
The evidence does not support the idea that creatine harms healthy kidneys.
The hair loss concern comes from one small study — without evidence of actual hair loss.
And while some people experience temporary bloating or water retention, many side effects can be minimized with proper dosing and hydration.

But perhaps the most exciting part?
Creatine is now being studied for far more than muscle performance.

Emerging research is exploring its role in:
🧠 Brain health + cognition
💪 Healthy aging + muscle preservation
⚡ Cellular energy + mitochondrial function
🩸 Metabolic health
🏃 Recovery + physical resilience

The key is understanding who may benefit, how to use it appropriately, and what the evidence actually shows — not what internet myths claim.

Comment CREATINE GUIDE for the full breakdown. 

And tell me in the comments: Have you tried creatine?
Your muscles are not just moving you through the w Your muscles are not just moving you through the world.

They are communicating with your brain.

A recent UK Biobank analysis following more than 51,000 adults found that higher handgrip strength was independently associated with lower dementia risk. Those in the highest grip-strength group had about a 50% lower risk compared with those in the lowest group.

This is observational data, so we are not saying grip strength alone prevents dementia.

But we are seeing, again and again, that muscle is a powerful biomarker of resilience.

Muscle tracks with metabolic health.
Insulin sensitivity.
Inflammatory tone.
Mitochondrial capacity.
Vascular function.
Functional reserve.
And, increasingly, brain health.

This is why resistance training belongs in the longevity conversation.

Not as vanity. Not as “toning.” As neuroprotection.

Your body and brain are not separate systems. The brain is downstream of the vascular, metabolic, inflammatory, and musculoskeletal body.

Build muscle now.

Your future brain is listening.

Source: Sun et al., 2026. UK Biobank prospective cohort analysis.
GLP-1s can help support weight loss. But they don’ GLP-1s can help support weight loss.
But they don’t fully address the metabolic stress happening after meals.
And for many patients, that’s where the real problem begins.

Repeated post-meal glycemic and lipemic spikes are deeply tied to insulin resistance, visceral fat accumulation, cardiometabolic dysfunction, and progressive metabolic disease.

In this upcoming webinar, we’ll explore an emerging gut-local approach designed to help buffer metabolic stress directly at the meal itself — using patented mesoporous silica technology to slow carbohydrate and fat absorption in the GI tract.

Join Dr. Sanjay Bhojraj, Dr. Eric Johnston, and me as we unpack:
🧬 The science behind post-meal metabolic dysfunction
🧬 The mechanism of SiPore® enzyme entrapment
🧬 SHINE trial outcomes
🧬 Clinical integration strategies for metabolic care and GLP-1 transitions

If you work with patients navigating metabolic dysfunction, prediabetes, weight management, or cardiometabolic disease, this is a conversation you won’t want to miss.

Comment SIPORE or head to https://www.drkarafitzgerald.com/2026/05/28/webinar-metabolic-gap-glp1s/ to register!
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

© 2026 Dr. Kara Fitzgerald, LLC | Site by Yakadanda

  • Shipping & Returns
  • Privacy Policy
  • Terms & Conditions
  • Get Directions
  • Contact
Footer menu
Go to Top
We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies.
Cookie settingsACCEPT
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Non-necessary
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
SAVE & ACCEPT
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

Follow Dr. Fitzgerald on YouTube