Blood Markers and Mood Changes


On 15th July, blood expert Jonathan Cohen will be  giving an informative lesson on how therapists may use blood markers in order to identify possible causes for mood disorders and solve problems that a therapist or general practitioner may not even realise that a patient has. 

Jonathan Cohen is a registered nutritional therapist and nutrigenetic counsellor with multi-disciplinary experience spanning over 25 years, and has plenty to say on the possibility of blood chemistry testing being a means to identifying problems within a client that they are unable to resolve through talking therapy or medication.

As a founding director of Functional Diagnostix Ltd (FDX) and leading specialist in functional blood chemistry testing & interpretation, Cohen has so much knowledge and passion on this topic and is willing to share with listeners the benefits of using blood markers to help clients uncover ailments that might otherwise have been misdiagnosed as depression or anxiety by a general practitioner. 

“The current medical paradigm, the conventional paradigm, only considers two states of health: Healthy or sick. I.e. if you are not sick, therefore you must be healthy.  Consider how many of your clientele have consulted their healthcare provider complaining of feeling less than optimal. Then have a meagre, simple blood test only to be told “there is nothing wrong with you, everything is okay”.  And yet they return to their healthcare provider, still complaining time and again until they are stamped with diagnoses of anxiety and depression.”

 “Normal Is Not Optimal” 

Cohen says that when a patient is asked to take a regular blood test, their results will usually come back as “normal” when in reality they are far from “normal” and a “far cry from functionally optimal”.  The problem is not with the blood test itself being incorrect but rather the perspective that traditional lab tests take:   They are based on statistics rather than on whether or not a certain value shown in the test represents good health. 

“As a multi-disciplined therapist I do not consider that the mind body and spirit should be split and considered separate. It has been my experience that a dysfunctional physiology can be a root cause for conditions that we treat as therapists, and likewise vice-versa.”

Cohen demonstrates that time and again an underlying, undiagnosed health condition could be the root cause of mood disorders and vice-versa, a mood disorder could be leading to an underlying health issue.Cohen says that the state of the body and mind is such that  when when one issue is not resolved, the other will not be. 

What is Cohen’s solution?

Cohen will be drawing attention to Functional Diagnostix Blood Health Reporting to identify the status of health within: 

  • 13 body systems 
  • 7 accessory systems 
  • 7 macro-nutrient systems 
  • 14+ nutrient needs 
  • 40 clinical dysfunctions 

Functional Diagnostix was founded by Cohen in 2015, when he found he was dissatisfied with the standard of blood testing offered by the NHS and private healthcare – and just how expensive they are. Inspired by Dr Weatherby’s work on the concept and practice of Functional Blood Chemistry analysis, FDX provides “the best and most affordable blood test panels” across Europe. 

At FDX, the diagnostics offered are referred to as “The Functional Approach” in which a chem screen is focused on the changes in physiology instead of pathology. The numbers that they refer to in testing are related to optimal physiology as opposed to what is considered statistically “normal”.

Looking at the blood in this way gives analysts a tighter “Functional Physiological Range” to look at to determine health within these systems. Comparing this range to the “normal” statistics discussed earlier, they can then indicate where something is going wrong, and how badly, in order to fix it.

Along with the Functional Approach, blood tests taken with FDX are easy to read and comprehend, and practitioners are provided with a full workup of current health problems, possible future health problems and a helpful guide on what the next steps could be. Cohen will be explaining this in more detail and the science behind how it works. 

To hear the expert speak more on this topic, sign up to Private Practice Hub today and register for our webinar at or join Private Practice Hub as a member to access the replay. 

Article written by Maisie Violet Wicks, BA Hons, columnist for Private Practice Hub. Please contact