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About Functional Diagnostic Nutrition
“Our Mission is to Educate as Many People as Possible How to Get Well and Stay Well Naturally So That They, in Turn, May Educate Others” ~ Reed Davis

Inspired by Education and Passion

Over 20 years ago, Reed recognized people were caught in a “cycle of trial and error” and he committed to being the last person they needed to see. While working with top leaders in alternative medicine, he ran thousands of labs on thousands of people and learned to identify “healing opportunities.” Using all-natural, drug-free protocols, Reed made observations about who got better and who didn’t, codifying which “general principles of health building” would outperform “specific treatments” being provided by standard and even alternative medicine. And through this work, he then developed the Functional Diagnostic Nutrition® Certification Course and D.R.E.S.S. for Health Success Protocol® to educate and empower as many people as possible about how to get well and stay well naturally, so they, in turn, may empower others to do the same.

Using his experience as an Environmental Paralegal, training as a Certified Nutritional Therapist and Fitness Coach, he served as the Health Director and Case Manager at the Better Health & Wellness Center in Poway, California for over 10 years. Reed’s experience in these areas served as the foundation for the development of the Functional Diagnostic Nutrition® Course, where he has taught nearly 3,000 FDN trainees and graduates in over 50 countries. Reed has helped practitioners all over the world interpret lab test results and develop natural protocols to restore function rather than just treating symptoms as a Clinical Advisor for BioHealth and other Laboratories. Reed is known as one of the most successful and experienced clinicians in the world today, having provided functional assessments to over 10,000 clients for hormonal and bone density problems, adrenal and thyroid dysfunction, digestion, detoxification and immune system issues. He is an expert in pathogen and food sensitivity testing and wide range of related health problems. Reed lives in Southern California, teaching the FDN Certification Course and helping his graduates build robust, private practices.


FDN’s mission is to educate as many people as possible about how to get well and stay well naturally so they in turn may educate and empower others to do the same. To achieve this, FDN provides cutting-edge functional lab assessment training and access to resources to continuously enhance people’s knowledge about functional health practices.


FDN health detectives do NOT diagnose or treat any disease, nor do we practice medicine. Everything we do is science and evidence-based. FDN’s investigate underlying causes and conditions at the core of people’s health complaints using functional lab testing and clues collected by our extremely thorough intake process.


FDN seeks to identify healing opportunities within the hormone, immune, digestion, detoxification, energy and nervous systems of the body. Once opportunities are revealed, function and health can easily be restored by implementing natural health building approaches that will have a positive effect on the root cause, and that will outperform specific treatments.

Our Advisory Board

Dr. Sandeep Gupta

Dr. Sandeep Gupta

Dr. Thomas Polucki

Dr. Thomas Polucki


William L. Wolcott


Dr. Alan Weinstein

Dr Aron Gonshor

Dr. Aron Gonshor

What is FDN?

Functional Diagnostic Nutrition® (FDN) is a complete methodology (way of thinking with the tools to go along with it) used to help people recover and maintain the best health possible.

There is no interest in diagnosing or treating disease, an area well attended by licensed physicians. Instead, FDN investigates hidden healing opportunities within the hormone, immune, digestion, detoxification, energy and nervous systems using functional lab testing.  The clues collected by objective and subjective assessments are then used to guide holistic lifestyle recommendations intended to coach up function in all areas of the body while coaching down contributors to Metabolic Chaos®, which will ultimately restore health and balance. For most chronic stress-related conditions, FDN is all a person needs to do to get well and stay well. For those with a serious medical condition, FDN is a proven stabilizer and holistic grounding program, adjunctive to the medical attention they may receive.

FDN Heart


FDN is an accredited program, the most trusted and well recognized brand with the longest history of training health coaches, professionals and health-minded people like you in the functional health industry.

You will learn how to interpret functional lab tests, how to use the data to drive holistic lifestyle recommendations, and upon completion get access to the best lab tests for you and your clients. You’ll then be able to use your FDN skills, and our complete methodology to help people on a deeper level so they can achieve long-lasting results leading to effortless and endless client referrals for you.  Not only are you taking a course, but you’ll also become part of a collective community consisting of over 3,000 FDN trainees in over 50 different countries, with a vast collective knowledge of which you can tap into, and all with the same mission of helping people on a deeper level.


Anyone with a passion for helping others and who is willing to walk-the-talk can take the FDN Certification Course. We believe that helping others to regain health, regardless of their starting point, requires only the proper training and leadership – all of which is provided in the FDN Course.

We’ve spent the past 20+ years developing the FDN system and providing leadership to thousands of every-day people, health coaching and health practitioners alike. All you have to do is learn FDN’s duplicatable system and you’re set. Today the FDN Community includes thousands of FDN Course graduates living and working in over 50 countries with all types of different backgrounds; some with prior training in health and wellness, and others without any.  No prerequisites are required. Once you complete the FDN Course, you are eligible to sit for board certification with the American Association of Drugless Practitioners to enhance your credibility even more.

FDN Group 3
FDN Joint 2


The short answer is, “all of them”.  Functional Diagnostic Nutrition® (FDN) is a fundamental way of looking at health and a type of detective work that seeks to identify and correct the underlying causes and conditions that lead to people’s health complaints.  We avoid diagnosing and treating disease, and try very hard to help each client rebuild health instead. This method of non-specific treatment is not only safe and effective, but it also outperforms specific treatment, ending the cycle of trial and error that many clients (and practitioners) get caught in. This approach allows us to help just about anybody in any condition.  We use well-chosen functional lab work and in-depth history taking to figure out what’s wrong, what needs fixing, and to guide the general principles of health-building to support every cell, tissue, organ and system in the body.

The certainty of this paradigm is illustrated in the following example….

Ms. Smith came to us with complaints of chronic joint pain (previously diagnosed with and treated for arthritis symptoms), muscle pain (diagnosed and treated for fibromyalgia), skin problems (psoriasis) and digestive issues (gastritis).  She also complained she was somewhat depressed and was tired most of the time. When her doctor suggested that she start taking yet another medication (anti-depressants), Ms. Smith got fed up with the diagnosis and treatment options being offered by standard medicine.  In essence, her biggest complaint was no longer the pain and discomfort she was experiencing, it was the current medical treatment and run-around she felt she was receiving. In her eyes, the medical model itself was contributing to a downward spiral in her quality of life.

Upon working with an FDN Practitioner and implementing the general principles of health-building that were specific to her according to her functional lab work, Ms. Smith felt immediate relief from her main health complaints within a matter of days, and within 90-days she was practically symptom free!

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Get Your Questions Answered & Find Out What You Can Expect When You Enroll and Become a Functional Diagnostic Nutrition Trainee.