What Is Functional Diagnostic Nutrition?

What Is Functional Diagnostic Nutrition?

What Is Functional Diagnostic Nutrition?

What Is Functional Diagnostic Nutrition ?

A Functional Diagnostic Nutrition Practitioner bridges the gap between clinical nutrition and functional medicine.

Functional Diagnostic Nutrition (FDN) is a type of detective work that seeks to identify and correct the underlying causes and conditions that lead to the patient’s health complaints.

FDN is not diagnosing or treating any disease nor practicing medicine.

Functional Diagnostic Nutrition (FDN) is a logical, systematic approach to identifying malfunctions at the subclinical level using functional lab testing combined with in-depth clinical correlation working with the clients history and lifestyle. FDN test the pathways and functions of the hormone, digestion, immune system, detoxification ability, and gut mucosal barrier function.

FDN is a holistic approach to restoring function and balancing the body’s systems supporting the body’s natural inclination for optimal health without drugs but with proven natural methods.

FDN embraces biochemical individuality while providing a precise methodology and logical sequence to achieving repeatable, consistent and successful clinical outcomes.

FDN is a holistic discipline that unites functional laboratory assessments with Metabolic Typing to identify imbalances, dysfunction and underlying conditions at the root of many common health complaints.

It doesn’t matter if the issue is excess weight, allergies, skin problems, joint pain, arthritis, insomnia, high cholesterol, hypertension, or any other condition. All these conditions have something in common, they all involve imbalance in one or more of the body’s Fundamental Homeostatic Control System/s causing stress to the body and thus should be approached on that level to be effectively addressed.



As a FDN practitioner I use BioHealth Diagnostics located in San Deiago CA. as our primary source for our testing. This is the only place in the world that does these sorts of tests. BioHealth specializes in functional laboratory assessments for the hormone, immune, metabolic, and gastrointestinal systems – tests that will help you diagnose the root causes of your  health complaints, remove symptoms and find healing opportunities.

What Is Functional Diagnostic Nutrition And How Does It Work?

I start by emailing you a series of very in-depth intake evaluation questionnaires and we begin with two lab tests that will give me a great overall picture of how well your body is functioning in relation to hormones, stress, digestion, immune function and detoxification. These results will give me very valuable information on what is the best direction to proceed to help support your body in its effort to find optimal health and whether or not further investigation is needed.

The first two tests you will do are

1. Functional Adrenal Stress Profile plus V, #205

This test is from saliva samples that you will take throughout 1 day. Inside these test results we will have your cortisol levels throughout the day, 2x DHEA, 1 estradiol, 1 estriol, 1 testosterone, 1 melatonin, 1 progesterone.

From these test results I will be evaluate your bodies individual ability to adapt to environmental, mental, emotional and physiological stressors. To determine the efficacy of DHEA therapy, to assess rest and recovery relative to morning and nighttime cortisol and understand the relationship of melatonin and progesterone.

Through this one test I will uncover your DHEA to cortisol ratio. This is important as abnormal ratios and adrenal rythme effects your bodies over all energy production, immune system health, skin regeneration, muscle and joint function, bone health, sleep quality, liver, pancreas and thyroid function.

Adrenal dysfunction may be associated with the following symptoms

  • Fatigue
  • Chronic stress and related health problems
  • Dizziness
  • Weakness
  • Hypoglycemia
  • Nervousness
  • Irritability
  • Depression
  • Inability to concentrate
  • Confusion
  • Poor Memory
  • Low blood pressure
  • Insomnia
  • Premenstrual tension
  • Sweet cravings
  • Headaches
  • Alcohol intolerance
  • Excessive hunger
  • Alternating diarrhea and constipation
  • Poor resistance to infection
  • Food and seasonal allergies
  • Migraine headaches
  • Low body temperature
  • Diminished sex drive


2. Metabolic Assessment Profile #101

This test is a urine sample and this tests indican, lipid peroxides and urinary bile acid sulfates. By doing this test you will uncover how well your body is digesting foods and the health of your detoxification pathways. The first measure is indican, which tells us how well you are breaking down and absorbing protein. This also is an insight into how well you are breaking down fats and carbohydrates also. We also look at lipid peroxides, this tells us if you have excessive oxidative stress in the small intestine. Both of these markers tell us how well your digestion is working. The last thing this test measures is the function of you main detoxification organ, the liver. The higher your Urinary Bile Acid Sulfates (UBAS), the harder the liver is having to work to do its day to detoxification. Without good liver function you cannot expect any real health, so huge importance is paid to getting optimal health from your liver. Through this one test we get an insight into toxic build up in the liver, digestion deficiencies, free radical damage, undetected pathologies.

Common complaints related to improper digestion and detoxification include

  • Heartburn
  • Reflux
  • Stomach pains/cramps
  • Intestinal pains/cramps
  • Constipation
  • diarrhea
  • Bloating sensation
  • Gas 
  • Nausea, vomiting
  • Painful elimination
  • Food cravings
  • Depression
  • Fatigue
  • Dark circles
  • Skin conditions
  • Headaches
  • Migranes

With just these two tests we are able to uncover a lot about what is going on in your body. In some cases these tests may uncover a need to do further testing such as a food sensitivity test. To find out the additional tests we may need to carry out click here. FDN Additional Tests.