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Understand your gut and learn to use food as medicine with Functional Nutritional Therapy.

Get advanced functional testing and expert nutritional strategies to target your health issues, regulate your hormones and empower your health.
Functional Nutritional Therapy & Testing | By Marie Cherrett | Nationwide by Zoom

Life changing results from patients

I can honestly say that Gayle has made such an amazing, positive impact on my health and I cannot be more grateful. I started visiting Gayle around three years ago, after having my gallbladder removed. The gallbladder removal had unfortunately not resolved many of my stomach issues. I was often sick and struggled to hold down food. Sleep was also a problem for me. This obviously resulted in me being permanently exhausted and I felt I reached the end of the road with what my GP could offer me. Gayle’s knowledge of nutrition backed up by functional tests highlighted what might be the issue, and with a guided change in diet and some natural supplements, I soon started to feel better.
A.C, CLIENT OF GAYLE MERCHANT
I contacted Marie for advice for my daughter who was having nose bleeds, mood swings and constipation. She also had severe abdominal pains and was underweight despite apparently eating well. Marie’s advice was very clear, detailed and extensive. It improved my understanding of the gut’s role in many health problems[...] My daughter no longer has nose bleeds, constipation and abdominal pains. She remains a little underweight but we are continuing to work on this[...] As a health professional [physiotherapist] myself, I see many clients who’s long-term health is being damaged by reliance on prescribed medications and their many side-effects. I really feel that functional medicine can offer so much more.
ANN THAVASIN, cLIENT OF MARIE CHERRETT

Start nourishing your body right away.

Start Nourishing your body with Marie Cherett's Recipes for Heavenly Hormones E-Book

If you can’t wait until your first consultation, Marie’s Recipes for Heavenly Hormones is packed with carefully curated, hormone-balancing, anti-inflammatory recipes the whole family will love. All recipes are suitable for the relaxed-paleo diet, any many are suitable for the Paleo and Paleo ketogenic diets. Whether you’re looking to support your hormones or improve overall wellness, this guide makes the process simple and delicious.

Functional Nutritional Therapy could be right for you if...

  • You experience fatigue, period pain or mood swings, and are seeking a nutritional therapist with specialism in hormonal balance.
  • You suffer from bloating, IBS or digestive issues and want to understand and optimise your gut-health.
  • You want to support your hormonal health during, pregnancy, breastfeeding and menopause and peri-menopause.
  • You want nutritional therapy that’s guided by advanced functional testing and interpretation.
  • You want to understand how your nutrition and gut-health may be contributing to symptoms of a chronic illness.
  • You want to experience what functional medicine has to offer before going deeper with a full Integrative Health Assessment and health plan.
Marie Cherret

“Seemingly mundane choices can hold the power to both trigger and heal chronic illness. I’ll empower you with the knowledge you need to transform your health and achieve lasting wellness.”

Marie Cherrett, Bsc. Nut Med, CFMP mFNTP
Certified Functional Medicine Practitioner, Nutritional Therapist

“I believe our bodies have their own innate wisdom and that there is no ONE ‘fix’ to an imbalance or a diagnosed disease. We are a blend of our histories, our food and lifestyle choices and our genetics, we are in fact unique walking recipes ourselves”.

Gayle Merchant, IFMCP, DipCNM (Nutritional Therapy), DipCNM (Naturopathy), AdvEFT.
IFM Certified Functional Medicine Practitioner

What is Functional Nutritional Therapy?

When we’re living with chronic illness, or going through changes like pregnancy or menopause, the choices we make every day—what we eat, how we nourish our bodies—can have a profound impact. With the overwhelming amount of diet and lifestyle advice out there, it can be hard to understand what actually works—and what works for you. This is where Functional Nutritional Therapy comes in.

Grounded in the principles of functional medicine, Functional Nutritional Therapy goes beyond basic nutrition to uncover root causes and provide highly personalised diet and lifestyle strategies tailored to you.

Through advanced functional testing like Gastrointestinal Mapping and DUTCH Hormone testing, your practitioner gains deep insights into nutritional deficiencies, your microbiome, hormonal profile, and biochemistry. This approach enables the creation of a personalised roadmap to nourish your body, detoxify, reduce inflammation, and restore hormonal balance. Say goodbye to the limitations imposed by poor health and embrace a future filled with renewed energy, vitality, and joy.

Functional Nutritional Therapy Can help you...

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Uncover hidden intolerances that may be contributing to IBS and chronic digestive issues (Pasta et al, 2024).
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Restore balance to your gut microbiome, improve digestive function and reduce digestive symptoms. (Thomas and Butler-Sanchez, 2021).
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Optimise your nutrient intake and absorption, which can contribute to chronic disease development (Jia et al, 2025).
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Reduce oxidative stress and balance your hormones (Sahoo et al, 2024).
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Support and strengthen your body’s natural detoxification process (Hodges and Minich, 2015).
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Nourish the brain for improved mental clarity and cognitive function (Tingö et al., 2024).

About Functional Nutritional Therapy.

Marie Cherrett is a highly skilled Functional Nutritional Therapist with a BSc in Nutritional Medicine and Post-Graduate training in Functional Medicine. She collaborates closely with our Integrative Medicine Doctors to provide specialised testing and tailored nutritional strategies as part of a full health plan and offers standalone services.

  • Virtual Consultation: Access support from the privacy and comfort of home with virtual consultation by Zoom.
  • Expert-led Functional Testing & Interpretation: Access the best available functional testing to support gut-health, detoxification and Hormonal Balance.
  • Targeted Nutrition and Supplementation: Get clear easy to follow guidance to improve your health from the inside out.
Image shows healthy woman that has been using the Functional Nutrition Therapy Services

The Service Step by Step

step 1
You’ll share some history with us prior to your consult and undergo optional baseline blood testing with our trusted functional testing partner. We’ll support you every step of the way.

If you’ve been referred as part of your health plan you’ll skip this step.
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We’ll take a deep dive into your symptoms, history, diet and lifestyle. We’ll interpret the results of your testing through a functional medicine lens and assess whether further testing is recommended.

If you’ve been referred as part of your health plan you’ll skip this step. 
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You’ll undergo optional advanced testing like Gastro-Intestinal Mapping and DUTCH Hormone testing to drive more targeted interventions. All tests are delivered to your door and completed from the comfort of home.
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Receive full interpretation of your results and targeted strategies to implement in your day to day life, designed to optimise your nutrition, balance your hormones, address sleep and more. You’ll meet regularly with Marie to asses your progress and fine tune your plan or we’ll handover seamlessly to your Integrative Medicine Doctor.

Pricing for Gayle Merchant

Free

Discovery Call

15 Minutes (Zoom)
Meet Gayle, Learn more about Functional Medicine and understand if it’s right for you. Get a jump start on testing if you’re keen to begin right away.
£360

Initial Consultation (Adult or Child)

90 Minutes (Zoom)
An in-depth initial consultation to explore your health concerns, conduct a holistic analysis of your health history and begin implementing support strategies.
£485

Initial Consultation & Test Interpretation (Adult or Child)

120 Minutes (Zoom)
An Initial consultation to review and interpret functional testing, take a deep dive into your health history and begin creating support strategies.

Pricing for Marie Cherrett

Free

Discovery Call

15 Minutes (Zoom)
Meet Marie, Learn more about Functional Nutritional Therapy and understand if it’s right for you. Get a jump start on testing if you’re keen to begin right away.
£270

Initial Consultation

90 Minutes (Zoom)
An Initial consultation to review and interpret Baseline blood results, take a deep dive into your health and begin creating strategies for testing and nutrition.
£180

Initial Consultation (Under 12s)

60 Minutes (Zoom)
An Initial consultation to review and interpret Baseline blood results, take a deep dive into your health and begin creating strategies for testing and nutrition.

Explore Pricing for Testing

Baseline Blood Testing

Optional
Pre-Assessment Baseline Blood Testing with our trusted partner VHL. Additional location-dependant fee payable for phlebotomy. (Typically £50 within London).
£330

Gastro-Intestinal Mapping + Zonulin

Stool Sample
Uncover the root causes of ill-health with Gastrointestinal Mapping. Receive 360 analysis of your gut bacteria, including inflammation, intestinal permeability, and parasitic, fungal and viral pathogens.
£395

DUTCH Hormone Testing

Urine Sample
Gain a comprehensive overview of your hormonal health with our range of DUTCH Hormone Tests. Ideal for anyone experiencing symptoms of hormone imbalance, chronic stress, or fatigue.
From £220

Organic Acids Test (OAT)

Urine Sample
Gain an in-depth snapshot of your overall health based on 76 metabolic analytes with our range of OAT tests. An excellent profile for anyone dealing with a complex health problem or seeking insight into gut-derived illness and health.
From £345

Meet Our Functional Nutritional Therapists

Gayle Merchant is an IMF Certified Functional Medicine Practitioner and holds diplomas in Naturopathy and Nutritional Therapy from the The College of Naturopathic Medicine. She specialises in chronic illness, complex cases, thyroid dysfunction and auto-immunity. With advanced training in Functional Test interpretation she turns complex clinical insights into clear, actionable personalised strategies.

Marie Cherret

Marie Cherrett is a highly skilled Functional Nutritionist specialising in chronic illness and hormonal imbalance. With a passion for transforming health from the inside out, she has successfully supported hundreds of clients globally, to leverage the power of food to address chronic health issues and disease. She delivers our ‘Support Programme’, ensuring clients stay on track as they implement our multi-disciplinary health plans.

What our Functional Nutritional Therapy clients are saying.

FAQ's

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Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.

Still have Questions?

The Five Pillars of Wellness: A whole approach to health

Our diet can have a profound effect on our health and wellbeing, influencing mood, cognition, gut-health and more. That’s why our multi-disciplinary health plans integrate advanced nutritional strategies and supplementation. However our Integrative Health Assessments go further addressing structural support, psycho-emotional work, epigenetics and detoxification to deliver a comprehensive approach to long term health that’s just for you. Take the first step today.

The Five Pillars of Health with Functional Nutrition Therapy. Image shows menopausal woman looking happy and healthy

Pasta, A., Formisano, E., Calabrese, F., Plaz Torres, M., Bodini, G., Marabotto, E., Pisciotta, L., Giannini, E. and Furnari, M., 2024. Food intolerances, food allergies and IBS: Lights and shadows. Nutrients, 16(2), p.265. Available at: Read Article Here [Accessed 21 Apr. 2025].

Thomas, A. and Butler-Sanchez, M., 2021. Dietary modification for the restoration of gut microbiome and management of symptoms in irritable bowel syndrome. American Journal of Lifestyle Medicine, 16(5), p.608. Available at: Read Article Here [Accessed 21 Apr. 2025].

Jia, M., Yin, H., Liang, Y., Jiang, F. and Li, H., 2025. Effect of trace elements and nutrients on 21 autoimmune diseases: a Mendelian randomization study. Frontiers in Immunology, 15, p.1462815. Available at: Read Article Here [Accessed 21 Apr. 2025].

Sahoo, D., Samanta, L., Kesari, K. and Mukherjee, S., 2024. Editorial: Hormonal imbalance-associated oxidative stress and protective benefits of nutritional antioxidants. Frontiers in Endocrinology, 15, p.1368580. Available at: Read Article Here [Accessed 21 Apr. 2025].

Hodges, R.E. and Minich, D.M., 2015. Modulation of metabolic detoxification pathways using foods and food-derived components: A scientific review with clinical application. Journal of Nutrition and Metabolism, 2015, p.760689. Available at: Read Article Here [Accessed 21 Apr. 2025].

Tingö, L., Bergh, C., Rode, J., Roca Rubio, M.F., Persson, J., Brengesjö Johnson, L., Smit, L.H. and Hutchinson, A.N., 2024. The effect of whole-diet interventions on memory and cognitive function in healthy older adults – A systematic review. Advances in Nutrition, 15(9), p.100291. Available at: Read Article Here [Accessed 21 Apr. 2025].

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