Atlas›Domain XII · Complementary, energy & biofield›Guide 171
Guide XII-171

Functional medicine

Jeffrey Bland, Susan Bland, David Scott Jones1990
A 24 · L 67 · M 911 interventions in the Trinity explorer
Client cardCompare
[source: …] where a claim comes from[uncertain] not confirmed in a primary source[synthesis] the writer's reconstruction

1. Introduction

Version followed: functional medicine as the Institute for Functional Medicine (IFM) publishes its model (Functional Medicine Matrix, timeline, antecedents–triggers–mediators), with the Cleveland Clinic Center for Functional Medicine as a published example of how a hospital service delivers it. This guide describes the method as its own organisations publish it (sections 1–3); section 4 is the psychotherapist's own work when a client is using or considering it. The psychotherapist does not practise, sell, prescribe or recommend functional medicine, its tests or its supplements.

What it is. IFM describes functional medicine as a "comprehensive, systems-based approach" aimed at the "root causes of disease" and at restoring healthy function, personalised by looking at genetic, nutritional, environmental and lifestyle factors. Cleveland Clinic frames its version as a holistic, "food-first" approach to chronic disease that asks "Why are you ill?" rather than only naming the diagnosis. [source: IFM history page; Cleveland Clinic "What is Functional Medicine?"]

Origins. IFM was founded in 1991 by Susan and Jeffrey Bland; Jeffrey Bland is a biochemist (PhD) whom IFM credits with developing the concept, and IFM also lists David Scott Jones, MD, as a co-founder. IFM dates the concept to 1990, its first symposium to 1993, its foundational course (Applying Functional Medicine in Clinical Practice, AFMCP) to 1998, its first certified practitioners to 2013, and its collaboration with Cleveland Clinic to create the Center for Functional Medicine to 2014. [source: IFM history; IFM founders] Where IFM was founded geographically is [uncertain: not verified].

Core idea of how change happens (as IFM states it). Chronic illness is understood as arising from interactions between genetics, lifestyle and environmental exposures over a lifetime. By retelling the patient's story chronologically and organising it into predisposing factors (antecedents), precipitating events (triggers) and ongoing perpetuators (mediators), clinician and patient are said to identify modifiable contributors; change is then pursued mainly through personalised lifestyle, nutrition, sleep, movement, stress and relationship interventions, sometimes with testing and supplements, alongside conventional medicine. [source: IFM history; IFM Matrix toolkit page; IFM timeline page; Cleveland Clinic]

What a client experiences (as Cleveland Clinic publishes it). Pre-visit questionnaires (including the PROMIS Global health questionnaire), a one-to-one visit with a physician, physician associate or nurse practitioner covering history, examination and lifestyle, a tailored plan that may include laboratory tests, at-home stool, urine or saliva kits and supplement recommendations, then referral to dietitians, health coaches, behavioural health therapists and group "shared medical appointments". Follow-up is usually planned after home-test results return. The centre tells patients to keep taking essential prescription medicines. Supplements are ordered through a clinic-linked online shop. [source: Cleveland Clinic new patient packet; Cleveland Clinic about page] Elsewhere, private practitioners vary widely in what they offer, what tests they order and whether they sell supplements [synthesis].

Who practises it. IFM states that functional medicine depends on conventional licensure: certified practitioners "incorporate functional medicine solely into their existing practice", and IFM certification "does not grant any additional specialty or legal status". [source: IFM licence FAQ] Practitioners therefore range across licensed professions (physicians, nurse practitioners and others per IFM eligibility rules [uncertain: eligible professions not verified]), and the title "functional medicine practitioner" is not itself a protected or licensed title in the main jurisdictions [uncertain: not verified for each jurisdiction; inferred from IFM's statement that certification confers no legal status].

Regulatory status (one line each).

  • Practice: governed by the practitioner's own licence and scope; IFM certification is a private credential, not a licence. [source: IFM licence FAQ]
  • Supplements (US): the FDA does not approve dietary supplements for safety or effectiveness before sale, and products claiming to treat, cure or prevent disease are generally regulated as drugs. [source: FDA Facts about Dietary Supplements]
  • Advertising (UK): health-therapy marketing needs objective (usually clinical-trial) evidence for efficacy claims and must not discourage essential medical treatment (CAP Code rules 12.1 and 12.2). [source: ASA/CAP Health: therapies general]

Evidence status (one line). The most cited evaluation is a retrospective cohort study from Cleveland Clinic (JAMA Network Open, 2019) reporting greater PROMIS global physical-health gains than primary care at 6 but not significantly at 12 months, with group differences and calls for prospective studies; no claim of treating any disease is made here. [source: Cleveland Clinic newsroom 2019]

2. Framework

The method's own framework (as published). IFM does not publish a fixed number of phases; its published tools describe a sequence [source: IFM timeline and Matrix pages; Cleveland Clinic packet]:

  1. Gathering the story: questionnaires, history and a chronological timeline from "in utero to present day".
  2. Organising: placing findings on the Matrix: antecedents, triggers and mediators on the left; seven "nodes" of physiological function (defense and repair; energy; mitigation and clearance; transport; communication; structural integrity; assimilation); and five lifestyle factors at the base (sleep and relaxation; physical activity; nutrition and hydration; stress and resilience; relationships and support networks); mental, emotional and spiritual components are said to be reflected in the Matrix.
  3. Shared planning: a personalised plan prioritised from the Matrix.
  4. Implementation and follow-up: coaching, groups, re-review of tests; Cleveland Clinic schedules a follow-up roughly 8–12 weeks after the first visit and runs group programmes over several weeks or months.

The psychotherapist's framework alongside it [synthesis]. Not a separate therapy; a thread woven into ordinary psychotherapy.

  • Phase A, Awareness (first sessions and at review points): routine, non-judgemental asking; recording what the client uses, who provides it, costs and whether their doctor knows. Move on once use is known and recorded.
  • Phase B, Meaning (inside ongoing therapy): explanatory model, hopes, expectations, what draws the client. Move on when the client's own goals and values are articulated.
  • Phase C, Decisions and coordination (as needed): values-based decision support; with consent, liaison with GP, prescriber or pharmacist. Move on when the client has a plan they own and the medical team is informed.
  • Phase D, Monitoring (ongoing): risk review (delayed medical care, restrictive eating, financial strain, health anxiety, children); return to A–C when anything changes.
  • Format: within existing individual, couple or family sessions; no fixed session count. Criteria for moving are the client's readiness, not completion of the functional medicine programme.

3. Guiding principles

Principles the method itself states [source: IFM history, Matrix and timeline pages; Cleveland Clinic]:

  • Patient-centred, individualised care: the story is the starting point. Practical meaning for the therapist: the client may arrive having felt deeply heard; respect that experience.
  • Root-cause, systems view (genetics × lifestyle × environment). Practical meaning: the client may hold a multi-cause model of their distress; explore it rather than argue it.
  • Lifestyle first, food first, "without extensive testing or supplements" for most patients (Cleveland Clinic wording). Practical meaning: overlap with sleep, activity, stress and relationship work in therapy is real and can be coordinated.
  • Works alongside conventional medicine; essential prescriptions continue. Practical meaning: the method's own leading services do not ask clients to stop prescribed treatment; any pressure to do so is a red flag.
  • Shared decision-making and collaborative planning (timeline page). Practical meaning: use the same language of partnership in therapy.

Principles for the psychotherapist alongside it [synthesis unless cited]:

  • Neutral, curious stance: neither endorse nor dismiss. Practical meaning: ask about it like any other part of the client's life.
  • Stay in scope: never advise on supplements, tests, diets or medicines (APA Ethics Code 2.01 Boundaries of Competence). Practical meaning: route every product or medicine question to the prescriber, pharmacist or the functional medicine clinician.
  • No conflicts of interest: never sell, refer for gain or co-market products, tests or programmes (APA 3.06 Conflict of Interest; 3.08 Exploitative Relationships). Practical meaning: decline affiliate links, practitioner codes or kick-backs.
  • Self-determination with protection for the vulnerable (APA Principle E). Practical meaning: respect adult choices; act on risk to children or to someone who cannot decide.
  • Coordinate with consent (APA 3.09 Cooperation with Other Professionals; 4.05 Disclosures). Practical meaning: write or call the GP or prescriber only with consent unless law or imminent risk requires otherwise.
  • Informed consent to your own role (APA 10.01). Practical meaning: tell the client early what you will and will not do about their functional medicine care.
  • Attribute, do not assert: describe claims as "the clinic's view" or "how they explain it". Practical meaning: protects the alliance and accuracy.
  • No disease-treatment claims: functional medicine is not presented here as treating any physical disease or mental disorder. Practical meaning: do not frame it to clients as a substitute for psychiatric or medical treatment.

[source for APA standards: APA Ethical Principles of Psychologists and Code of Conduct]

4. Intervention inventory

All interventions below are the psychotherapist's own work alongside functional medicine. They are [synthesis] built on the cited sources; none is an IFM or Cleveland Clinic technique. The therapist never orders or interprets tests, recommends supplements, diets or protocols, or advises on medicines.

4.1 Routine, non-judgemental asking and recording

  • Purpose: know what health care the client is actually receiving; make it discussable. Use at intake, at reviews, and whenever the client mentions a new practitioner, test, "protocol" or diet.
  • Steps: (1) Ask about all health care in one neutral question that includes complementary care. (2) If functional medicine is named, ask who provides it and their profession or licence (IFM says practitioners work within an existing licence [source: IFM licence FAQ]). (3) Ask, in general terms, what the plan involves: questionnaires, tests, home kits, diet changes, supplements, groups, coaching. Do not ask for or record product names and amounts as if clinically assessing them; note them only as the client reports them. (4) Ask whether their GP, psychiatrist or pharmacist knows. (5) Ask about cost and how it is paid. (6) Record factually in the notes in the client's words.
  • Example language (illustrative): "Lots of people use other kinds of health care alongside their GP: functional medicine, supplements, special diets. Is any of that part of your life at the moment?" / "Who's the practitioner, and what's their background?" / "Does your doctor know about this plan?"
  • Watch for: relief or defensiveness at being asked (both are data); vague answers about the practitioner's qualifications; a plan the doctor has not been told about. Working when: the client mentions changes spontaneously at later sessions.

4.2 Exploring meaning, hopes, expectations and explanatory model

  • Purpose: understand why functional medicine matters to this client and what they hope it will change, especially for unexplained or long-standing symptoms, fatigue, gut symptoms or low mood. Use after 4.1 and whenever hopes seem high or the client is distressed by results.
  • Steps: (1) Ask what drew them: being listened to, a "root cause", control, hope after failed treatments, distrust of mainstream care, identity, community, a friend's story. (2) Elicit their explanatory model in their words: what they think is causing the problem and what they think will help. (3) Note the method's own emphasis on a long consultation and a life timeline "from in utero to present day" that patients often find validating [source: IFM timeline page]; ask what it was like to tell their story that way. (4) Explore expectations: what would "better" look like, by when, and what if it does not come. (5) Link to psychological themes without reinterpreting their model: control, grief for lost health, trust and abandonment by doctors. (6) If the timeline work surfaced trauma or painful history, check whether it was contained and offer to work with it in therapy.
  • Example language (illustrative): "What was it about this approach that felt right for you?" / "In your own words, how do they explain what's going on?" / "If this works the way you hope, what would be different in six months?" / "Going through your whole life history like that can stir things up. How was that for you?"
  • Watch for: all-or-nothing hope; meaning tied to proving a single physical cause for emotional pain; anger at previous doctors that could become wholesale rejection of medicine. Working when: the client can hold both hope and uncertainty and name their own priorities.

4.3 Clarifying the plan, costs and commitments

  • Purpose: help the client see the full picture of what they are committing to, especially testing and supplement costs. Use when the plan is new, expensive, open-ended or causing strain.
  • Steps: (1) Ask the client to describe the plan in sequence (as with Cleveland Clinic: visit, tests, home kits, follow-up, groups [source: Cleveland Clinic packet]). (2) Ask what is covered by insurance or the NHS and what is out of pocket; Cleveland Clinic's own packet tells patients to check coverage and directs supplement orders to a clinic-linked shop [source: Cleveland Clinic packet]. (3) Help the client list questions to put to the practitioner: what each test is for, how results will change decisions, what is not covered, how long the plan lasts, whether supplements must be bought from the practice. (4) Explore the affordability and the feelings around spending (hope, guilt, sunk cost). (5) Do not evaluate whether a test or product is worthwhile; that is a question for the clinician.
  • Example language (illustrative): "Can we map out what you've signed up for, step by step?" / "Is there anything you're paying for that you're not sure about? What questions would you like to ask them?"
  • Watch for: escalating repeat testing, large ongoing supplement spending, borrowing or hiding spending, being told to buy only through the practitioner. Working when: the client asks the practitioner direct questions and makes cost decisions deliberately.

4.4 Supporting informed, values-based decisions without coercion

  • Purpose: help the client decide (start, continue, adjust, stop, combine) in line with their values, with accurate information from qualified sources. Use at decision points: new expensive phase, a recommendation to change or stop a prescribed medicine, conflicting advice.
  • Steps: (1) Name the decision precisely. (2) Clarify values and priorities (energy for family, avoiding side effects, cost, trust). (3) Identify what information they need and who can give it: the functional medicine clinician, their GP or psychiatrist, a pharmacist, a registered dietitian. Help them prepare questions. (4) Weigh options against values in a simple pros/cons or values grid of your own making; no published decision aid for functional medicine is cited here [uncertain: not verified]. (5) Check for pressure from practitioner, family or online groups. (6) Respect the decision; agree how you will review it.
  • Example language (illustrative): "What matters most to you in deciding this?" / "That's a question for your prescriber, and it's a good one. Shall we write it down so you can take it in?" / "Whatever you decide, I'm on your side in working it out."
  • Watch for: the client wanting you to decide or approve; decisions made to please someone; a plan to stop prescribed medicine without the prescriber. Working when: the client can state their reasons in their own terms and has the prescriber's input where medicines are involved.

4.5 Coordinating with the client's doctor, psychiatrist or pharmacist (with consent)

  • Purpose: reduce fragmented care, interaction risk and conflicting advice. FDA states supplements can interact with medicines and interfere with laboratory tests and advises talking to a doctor or pharmacist before use [source: FDA Facts about Dietary Supplements]. Use when the client takes prescribed medicines (especially psychiatric ones) and supplements, or when plans conflict.
  • Steps: (1) Explain why coordination helps. (2) Obtain specific written consent: who, what, for what purpose (APA 4.05 [source: APA Ethics Code]). (3) Encourage the client first to tell the GP or pharmacist themselves, bringing the full list of supplements and products. (4) If you contact the doctor, share only what is needed: that the client is under functional medicine care and taking supplements they will list, plus any psychological concern (mood change, restriction, anxiety). (5) Never give your own opinion about a product, test or dose. (6) Record the consent and contact.
  • Example language (illustrative): "Would you be OK with me letting your GP know you're seeing a functional medicine practitioner, so they have the full picture?" / "Could you take every bottle or the list to your pharmacist and ask them to check it against your prescriptions?"
  • Watch for: refusal driven by fear of being judged by the doctor (explore it); the client being told not to tell their doctor. Working when: the doctor or pharmacist is informed and the client reports a joined-up plan.

4.6 Responding to "functional" claims about mental health and psychiatric medicines

  • Purpose: keep mental-health treatment safe when the client reads or hears functional explanations of depression, anxiety or other conditions. IFM itself frames lifestyle and nutritional approaches for depression as adjunctive, inside a model that includes conventional care, while questioning a medication-only focus [source: IFM Adjunct Therapies for Depression]. Some practitioners and online sources go further [uncertain: not verified].
  • Steps: (1) Ask what they have been told about the cause of their low mood or anxiety and what that means to them. (2) Acknowledge what fits ordinary psychological care (sleep, activity, relationships, stress). (3) If the client is considering stopping or reducing psychiatric medication, route the decision to the prescriber; ask them not to change anything before speaking to the prescriber; do not advise either way. (4) Increase monitoring of mood and suicide risk during any medication change the prescriber agrees to, following standard risk assessment. (5) If a practitioner presents a supplement or diet as a replacement for needed psychiatric treatment, discuss the risk openly and, with consent, inform the prescriber.
  • Example language (illustrative): "It sounds like the idea of a physical cause made a lot of sense to you. Can we talk about what it would mean if it were only part of the picture?" / "Changes to your medication are something to plan with your prescriber. Would you be willing to talk to them before changing anything?"
  • Watch for: abrupt medication stops, mood deterioration, self-blame if the "root cause" plan does not work. Working when: the client involves the prescriber and keeps therapy and medical care in one plan.

4.7 Recognising and responding to risk

  • Purpose: identify the situations where alongside care becomes a safety issue. Use continuously.
  • Steps and red flags: (1) Delay or stopping of medical care: Cleveland Clinic tells its patients to keep taking essential prescriptions [source: Cleveland Clinic packet]; UK advertising rules treat discouraging essential treatment as a breach [source: ASA/CAP]. If the client is delaying assessment of new or worsening symptoms, encourage prompt medical review. (2) Restrictive eating: elimination or restrictive plans can overlap with eating disorders. Screen for NEDA's orthorexia warning signs (cutting out more food groups, a narrow set of "pure" foods, distress when "safe" foods are unavailable, rigid planning, psychosocial impairment); malnutrition risk and a team of physician, therapist and dietitian are what NEDA describes [source: NEDA orthorexia]. Refer to eating-disorder services and the GP when signs are present. (3) Children: if a parent applies restrictive diets, testing or supplements to a child, check that the child's doctor is involved; follow safeguarding procedures where a child is deprived of needed medical care or adequate nutrition [synthesis]. Cover the child's assent and parental consent when the child is your client. (4) Pregnancy and breastfeeding: encourage the client to discuss all supplements and diet changes with their midwife or obstetric team [synthesis]. (5) Financial harm: escalating spending, debt, pressure to buy products from the practitioner or to recruit others (multi-level marketing) [synthesis]. (6) Group pressure: online communities or programmes that shame medication use or discourage contact with doctors [synthesis].
  • Example language (illustrative): "You mentioned the list of foods you eat has got shorter. Can we look at that together?" / "New symptoms like that need checking with a doctor soon, whatever else you're doing."
  • Watch for: secrecy, weight loss, isolation, rising costs, a child missing medical appointments. Working when: risks are named, shared with the right professionals and reviewed.

4.8 Health anxiety and somatic symptom presentations (cross-ref Domain II)

  • Purpose: some clients seek repeated testing or new explanations for persistent symptoms because of health anxiety or somatic symptom distress. Use when testing does not reassure for long, the client searches for causes compulsively, or symptoms drive avoidance.
  • Steps: (1) Assess using your usual health-anxiety and somatic-symptom assessment (see Domain II). (2) Explore the cycle: symptom, worry, checking or testing, brief relief, renewed doubt. (3) Without contesting the physical explanation, offer the established psychological treatment for the anxiety and distress itself (CBT for health anxiety or somatic symptoms per Domain II). (4) Coordinate with the GP so that one clinician holds the medical overview and testing is planned rather than reactive. (5) Treat new tests, "sensitivities" or labels as triggers to work with, not facts to dispute.
  • Example language (illustrative): "I'm not in a position to say what's going on in your body. What I can help with is how much the worry is taking over. Would that be useful?"
  • Watch for: therapy becoming another arena for checking; the client feeling dismissed. Working when: the worry cycle loosens and medical decisions are planned.

4.9 Coordinating overlapping lifestyle work within scope

  • Purpose: functional medicine plans emphasise sleep, physical activity, stress, relationships and support (the Matrix's lifestyle factors [source: IFM Matrix page]); these overlap with psychological work. Use when the client asks the therapist to help them "stick to" a plan.
  • Steps: (1) Distinguish what is within your scope (behaviour change, motivation, sleep habits, stress management, relationships, emotional eating patterns) from what is not (diet content, supplements, tests). (2) Work on the psychological side using your usual methods. (3) Leave nutritional content to the dietitian or clinician. (4) Watch that adherence work does not reinforce rigidity or restriction (see 4.7).
  • Example language (illustrative): "I can help with the habit side and the stress around it. The details of what to eat are for your dietitian."
  • Watch for: you being positioned as the plan's enforcer; guilt and perfectionism. Working when: the client relates to lifestyle change flexibly.

4.10 Managing your own role and conflicts of interest

  • Purpose: keep the relationship ethical when the therapist has views on, training in, or links to functional medicine. Use always; review if a client asks for a recommendation.
  • Steps: (1) Do not sell supplements, tests, programmes or practitioner codes, and decline referral fees (APA 3.06, 3.08 [source: APA Ethics Code]). (2) Do not recommend specific practitioners on the basis of your own beliefs; signpost to the client's GP or to regulators' registers for checking a practitioner's licence [synthesis]. (3) Tell the client early what you will and will not do (APA 10.01). (4) Use supervision when your own beliefs (for or against) are strong.
  • Example language (illustrative): "I don't recommend or advise on particular treatments or supplements; that's outside my role. I'm glad to help you think it through."
  • Watch for: pressure to take sides; your own enthusiasm or scepticism leaking into the work. Working when: the client experiences you as neutral and safe.

4.11 Reporting routes

  • Purpose: know where to direct concerns about products, practitioners or advertising. Use when the client experiences harm, misleading claims or exploitation, or when there is a child-protection concern.
  • Steps: (1) Adverse reactions to supplements: client contacts their doctor first; in the US, FDA's Safety Reporting Portal [source: FDA]; in other countries, the national medicines or product regulator [uncertain: specific routes not verified here]. (2) Misleading health advertising: in the UK, the ASA [source: ASA/CAP]; in the US, the Federal Trade Commission [uncertain: not verified here]. (3) Practitioner conduct: the practitioner's own licensing board, since functional medicine practice sits under that licence [source: IFM licence FAQ]. (4) Children: local safeguarding procedures. (5) Help the client decide whether to report; with consent, assist; report without consent only where law or safeguarding requires (APA 4.05).
  • Example language (illustrative): "If you think that product made you unwell, it's worth telling your doctor, and there's a way to report it to the regulator. Would you like help with that?"
  • Watch for: shame or fear of retaliation; loss of savings. Working when: the client has used the route they chose.

5. Handling problems

The cited sources do not address psychotherapists' problems alongside functional medicine; all guidance below is [synthesis] unless cited.

  • Client asks you to recommend supplements, tests or a practitioner. Restate your role kindly; turn the request into questions for the prescriber, pharmacist or functional medicine clinician; offer to help them prepare. Illustrative: "I'm not the right person to advise on that, but I can help you work out what to ask."
  • Client wants your approval or your disapproval. Reflect the wish for an ally; return to their values (4.4). Avoid stating personal opinions about the method's validity.
  • Client hides functional medicine use from their doctor. Explore the fear (being dismissed, scolded); rehearse the conversation; offer to support with consent (4.5).
  • Client plans to stop psychiatric medication on a practitioner's or online advice. Do not argue the theory; ask them to involve the prescriber before any change; increase mood and risk monitoring; with consent, inform the prescriber (4.6). If acute risk emerges, follow standard risk procedures.
  • Stuck: repeated tests, new labels, no improvement. Name the pattern gently; work on health anxiety or grief for lost health (4.8); encourage one clinician to hold an overall medical plan.
  • Disappointment, self-blame or anger when the plan does not help. Validate; separate effort from outcome; address shame ("I didn't do it properly"); explore what they still value from the experience (being heard, lifestyle changes).
  • Restriction escalating. Screen for orthorexia and other eating disorders using NEDA's warning signs [source: NEDA orthorexia]; involve the GP and eating-disorder services; avoid becoming the person who "checks" food compliance.
  • Financial strain or exploitation. Make cost visible (4.3); explore sunk-cost thinking; consider debt advice; report misleading claims where appropriate (4.11).
  • Family conflict about the treatment. Offer a joint session with consent; keep each person's concerns and values in view; protect any child's access to medical care (4.7).
  • Rupture: client feels judged after you raise risk. Acknowledge directly, own your part, re-state that you are neither for nor against the method but for their wellbeing, and repair before returning to the risk.
  • Overwhelm from timeline or history-taking. If the functional medicine life-history interview stirred trauma memories, stabilise first, then offer trauma-focused work within therapy at the client's pace.
  • Therapist's own conflict. If you practise, sell or are strongly invested in functional medicine (or strongly opposed), take it to supervision and consider whether you can stay neutral (APA 3.06 [source: APA Ethics Code]).
  • Non-adherence to therapy because energy and money go to the programme. Explore priorities openly; agree a realistic therapy rhythm rather than competing with the programme.

Sources

← Previous · XII-170Biological medicine and biological dentistryNext · XII-172 →Integrative medicine and integrative oncology