The Longevity Nutrient

The Unexpected Fat That Holds the Key to Healthy Aging

By: Stephanie Venn-Watson

Narrated by: Stephanie Venn-Watson

Unlock the secret to longevity with Dr. Stephanie Venn-Watson’s “groundbreaking, once-in-a-century discovery” (Mark Hyman, MD, New York Times bestselling author) of the molecule C15:0—an essential fat found in whole milk, cheese, and fatty fish—that can improve your health and increase your lifespan.

The hunt for the holy grail of healthy aging has been ongoing for hundreds of years, and Dr. Stephanie Venn-Watson may be its most unlikely champion. As a veterinary epidemiologist, she was recruited by the US Navy to lead a clinical research program to continually improve the health of Navy dolphins. Using advanced biotechnology to study the healthiest aging dolphins, she discovered C15:0, a saturated fat which has the potential to expand both the health-span and lifespan in long-lived mammals.

In The Longevity Nutrient, Dr. Venn-Watson unveils the science behind C15:0, the first essential fatty acid to be discovered in nearly a hundred years. This revolutionary discovery identifies the crucial ingredient for combating chronic aging-associated diseases. This book unfolds like a detective story, bringing you along through the science and discovery of this extraordinary nutrient. The implications of adding this nutrient back into the American diet could not be more significant. Mounting scientific evidence supports that C15:0 can:

- Reduce the risk of and reverse fatty liver disease.

- Reduce the risk of and reverse type 2 diabetes and heart disease.

- Meaningfully slow the effects of aging to improve overall well-being.

Perhaps the most surprising discovery? In the end, it may just be the saturated fat that saves us all.

In this “life-changing” (Thomas DeLauer, author of Intermittent Fasting Made Easy) book, Dr. Venn-Watson tells the extraordinary story of this discovery and examines the paradigm shifting implications for human health and aging. She presents the easy, practical steps for you to responsibly bring this essential C15:0 fat into your life to improve your long-term health and wellness.

PLEASE NOTE: When you purchase this title, the accompanying PDF will be available in your Audible Library along with the audio.

©2025 Stephanie Venn-Watson (P)2025 Simon & Schuster Audio

Curing the body and sole

This book was narrated by the author and used many technical terms and words that the average person like me find hard to understand. I was, however, able to get the gist of what she was saying. She definitely has me rethinking how I do nutrition and supplements. She has me thinking how many of the ailments I suffer from could be because of a lack of C15 in my diet. I just ordered her supplement, Fatty C15. It seems legit and I cant wait to get started and hopefully start seeing positive results. I absolutely recommend this book! I learned alot and I am sure you will too.

Very important information!

I have been taking the C15 nutrient for about two months and I definitely feel the results ... more energy, better focus and overall well-being. The book allowed me to understand the vast research that went into the longevity nutrient and why it is so very important to overall well-being.

Great information!

The content and quality was fantastic! There was nothing I did not like about the book!

A must try for me!

As a layperson this was a lot of talking about things I knew nothing about BUT I’m excited to give C-15 a try because it sounds like it could possibly address my health issues in a positive way!

Outstanding and Informative!

Outstanding information... a "Must" listen to IMHO. I normally enjoy books narrated by the author, and this was no exception. Despite getting a little "nerdy/sciencey" at times, Stephanie makes it easy to listen to and for the most part, very understandable. Tons of valuable information. I highly recommend it.

What an amazing story!

This is an excellent book with fascinating science - highly recommended for anyone interested in understanding more about diet and health.

Loved book, but No PDF!

No pdf with audiobook. Loved the science! Would like more on dosage for diabetes, cancer, heart disease, anemia etc. Thanks! Great work!

Worth listening to

Giving 5 stars rating as I think it is worth listening to. I am grateful for the work the author performed. Although some of the author's conclusions have contradictions. 

The most important info for me to take from this book is that higher blood levels of C-15 might improve health and function of the cells, reduce HbA1c (possibly by improving beta-cells function)  and reduce GGT blood levels (possibly by eliminating hemochromatosis). I am putting this to the test for 3 months.

Three main faulty assumptions the author is making:
1)  High fat dairy has to be consumed daily, to raise C-15 levels to stay healthy -
- I would like the author to answer how Leila Denmark (famous American pediatrician) saved the lives of thousands of children, was against dairy, lived till 114 and worked till 103. People from all states were bringing their terminally sick dying kids to her and she would reverse their condition. 

2)  Low C-15 blood levels are associated with allergies, autoimmune conditions, and type 2 diabetes -
- I also would like the author to reply why she had allergies to almost all foods if she was consuming a full fat dairy? Also why I never had any allergies my entire life (I am over 60) despite the fact I didn't consume ANY dairy, and how is it that my insulin sensitivity comes out to be about 200%?   Why did my mother and my siblings get autoimmune despite they loved full fat dairy? Also how do Dr.Dean Ornish and Dr. Neal Barnard achieve the reversing arterial plaque and reversing type 2 diabetes (improving insulin sensitivity) in their patients on a low fat diet free from dairy?

3) Omega-3 supplementation does not improve health -
- The author is going through multiple trials/studies proving no health difference in groups taking omega-3 and control groups. But when she talks about C-15 studies, she points out that the blood level for C-15 was measured, and that you have to achieve a certain level to see any positive improvements, just taking C-15 is NOT enough. None of the omega-3 trials however measured omega-3 levels to target a certain level. None of the trails even checked the quality or rancidity of the omega-3 supplements. 

A Groundbreaking Take on Aging and Wellness

The Longevity Nutrient presents relatable science and Dr. Venn-Watson's groundbreaking discovery while studying Navy dolphins, revealing how a specific nutrient impacts long-term health. She explains how this nutrient can improve cellular health, reshaping my understanding of nutrition and aging for both myself and my family. Despite lacking a medical background, I found the material easy to understand and realized that neglecting my cellular health would lead to faster, unhealthy aging. This awareness has led me to make mindful changes to my diet, such as switching from skim milk to whole-fat dairy. I highly recommend The Longevity Nutrient to anyone interested in health, wellness, and the science of aging. Dr. Venn-Watson’s expertise and dedication to improving global health make this a must-read for anyone seeking a healthier, longer life.

Stephanie is a True SME! The GOAT of the Fatty 15 Team

Stephanie was both informative and entertaining.
She made the science easy for a layperson to understand and relate to on every level.
I am more of a fan than I already have been after listening to the audiobook. I am spreading the word with even more confidence.
Keep up the Good Nerdy Work!!
Thanks!!!🤩🤩