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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 & Gayle Merchant | Nationwide by Zoom
★★★★★ 5.00 Based on 26 reviews for the Functional Nutrition Team

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.

Google

Marie Cherrett

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"A catch up with Marie on Zoom. She was as supportive, knowledgeable & helpful as always. It’s easy to follow the protocols when the practitioner is as good as this"
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Roger Telfer
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Gayle Merchant

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"I have had a couple of consultations with Gayle and have found her to be very patient and gentle natured , understanding and non judgmental .She is always willing to listen and gives me plenty of time to waffle on ,l never feel rushed, she makes me feel as though everything l say regarding my health is of value, she never dismisses or minimises anything. She is skilled at unwrapping and analysing the information l share with her and always ensures l understand and am happy."
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Sun S
Google

Marie Cherrett

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"My consultation with Marie to review my test results was incredibly valuable. She combines deep knowledge with a very reassuring and compassionate approach. I felt genuinely listened to and validated, and she helped me make sense of a lot of complex information in a clear and supportive way. I'm very grateful for her guidance and feel confident continuing to work with her as I move forward on my health journey."
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Charlie F
Google

Marie Cherrett

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"Im 10 weeks into a long healing/repair process and im very happy with the plan laid out and explanations given by Marie.."
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Ian E
Google

Gayle Merchant

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"Gayle is fab"
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Raphael
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Marie Cherrett

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"My experience with the Forbes Clinic and Marie has been exceptional. Marie is kind, caring and supportive and was always first to congratulate any achievement big or small! Her support and expertise was critical to my health and it's improvement. Thank you!"
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Verified Patient
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Marie Cherrett

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"Marie breaks down health and menopause in a way that’s easy to understand. Her advice helps women navigate this stage with clarity and make lasting changes.. Plus, her delicious recipes are a great bonus!"
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Marie Cherrett

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"Marie’s insight and knowledge of hormones and health is 1st rate. She really knows her stuff and explains everything simply so you can understand. Navigating healing can be overwhelming and Marie has been a breath of fresh air!"
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Marie Cherrett

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"Marie is wonderful and a consummate professional. I'm always staggered by how much she knows about nutrition, hormone health and the way our body functions. I would recommend her without any hesitation., Book a call with her today and you'll know exactly what I'm saying."
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Marie Cherrett

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"My experience with Marie has been truly empowering. Her insight into hormonal health goes beyond surface-level fixes—she gets to the why behind your symptoms & helps you reconnect with your body in a deeply intuitive and sustainable way. Marie brings a blend of science-backed wisdom & heartfelt compassion. She breaks down complex hormonal patterns into clear, actionable steps that actually fit into your life. What sets her apart is how personalized & practical her guidance is. It’s not about quick fixes—it’s about creating real, lasting balance from the inside out. I wholeheartedly recommend Marie to any woman ready to feel grounded, vibrant, and naturally aligned—without relying on hormone replacement therapy."
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Marie Cherrett

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"Marie has helped me a lot with my food allergies and anxiety. Before, I felt unwell and didn’t know what was causing my problems, but Marie recommended a great test and a consultation where she explained everything in a way that was easy for me to understand. I don’t always follow all the advice perfectly, but I’ve still noticed a big improvement in my general health and how I feel. Marie is a great practitioner who is kind and patient and I would happily recommend her to anyone who is struggling with their health."
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Verified Patient
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Marie Cherrett

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"I had my first consultation with Marie about a year ago when I was feeling terrible. My mood and energy were low, I was very anxious and my menopause symptoms were out of control with hot flushes during the day and worse at night, causing me severe sleep problems Marie recommended the DUTCH test as a first step to see what was going on and when the results came, it was such an eye opener and with Marie carefully explaining all the results, I was finally able to get a clear picture of why I was feeling so awful. The next step was Marie taking me through a plan to get me feeling better. She looked at my diet and it was very obvious, once gently pointed out, that my food choices and eating habits were not serving me very well! In my effort to loose weight, I was practically starving myself and achieving the opposite. Marie has completely changed my understanding of a healthy diet and after implementing some easy changes and adding some key supplements, for a good few months now I am feeling 100% better. My mood and energy are good, anxiety is massively improved. I still have hot flushes (I do not want to take HRT) but they are also under control and are not impacting on my life and sleep as much. Marie is fantastic to work with, she is very professional and explains everything so well and with great kindness and never any judgment. If you are struggling with issues relating to menopause or any other hormonal issues or simply need someone to guide you on a journey to healthier living, then I highly recommend Marie. Thank you Marie for all your help!!"
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Verified Patient
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Marie Cherrett

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"When I started working with Marie she said she would 'hold my feet to the fire' to achieve my health goals. And, she did, but with a level of compassion, empathy, understanding, expertise, enthusiasm and commitment that converted a challenge to an enjoyable process. Marie has a wealth of knowledge, which she imparts in an easy-to-understand and implement manner. Marie's approach is highly motivational and manageable, with her pleasant but firm demeanour, she provides a constant nudge to keep going no matter what distractions arise. I would highly recommend Marie'"
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Marie Cherrett

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"Despite having a healthy lifestyle, I had been experiencing gut health issues for a number of years, and sometimes the symptoms including pains and discomfort around my gut were quite severe. Following visits to the doctor, blood tests, and cutting out certain foods that were triggering the issue, the symptoms would still return, and I was experiencing significant energy crashes from consuming just small amounts of sugar and wheat. Having an active job means that I have to maintain my energy levels, stay healthy, and strong to carry out my work. Thankfully I met Marie and started to follow her work, and in 2024 I signed up to a gut health programme with her. Through comprehensive gut microbiome testing, Marie was able to identify the causes of my symptoms, and she guided me through a 3-step process to address the issue and improve my gut health. Whilst it was challenging to go through this process and make so many changes, it has been truly eye-opening, and worthwhile, and Marie has been there every step of the way to guide me with a great deal of knowledge, kindness and patience. I have learnt so much from Marie through this process, and it has opened up a whole new world of food choices and nutrition that I may never have explored before. I wouldn’t hesitate to recommend Marie’s programme and guidance."
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Marie Cherrett

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"Marie has been extremely helpful with regard to my thyroid issues and her knowledge, expertise and advice is always given with the utmost compassion and care. Whilst using Marie's services, I have made some small but vital changes which have had a positive impact on my thyroid symptoms as well as general overall health. I love the holistic approach Marie has as eating and using natural products is very important to me!"
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Marie Cherrett

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"We didn’t get to discuss the follow up in terms of why what is being suggested. Ie, paleo diet vs others. There is a lot of information in the follow up practical emails that is a bit overwhelming. Marie is lovely though. We may have just run out of time."
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Marie Cherrett

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"Marie has been an exceptional partner in my health journey. Her calm and compassionate presence has been incredibly reassuring as I navigate the complexities of my health and wellness. She offers insightful, practical advice tailored to my unique needs, and I genuinely look forward to our consultations. It’s clear that she truly cares about her patients and is wholeheartedly committed to supporting them in achieving optimal health. I’m grateful for her guidance and expertise."
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Marie Cherrett

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"Marie was very good, taking on board my current challenges with the protocol, and helping me find a way to make it work for me."
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Marie Cherrett

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"Following sepsis over a year ago, I was still under hospital care and struggling with my health. Despite eating a healthy diet, I was getting increasing digestive problems, weight gain, constant fatigue and back and joint pains. Since my first consultation with Marie, she has always been at hand to help and guide me, with the result that all my symptoms are now resolving. She is an expert in her field, and together with her extremely kind and caring approach, I felt very reassured. As a retired GP, I wish I had known about Marie years ago."
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Marie Cherrett

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"Marie was excellent. Explained things really well and made a what seemed a difficult few months ahead managable. Would thouroughly recommend."
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Marie Cherrett

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"This lady is so incredibly knowledgeable, patient, helpful and supportive. A true god send for me and family. Nothing is too much trouble -she has helped me above and beyond what I needed. I can’t speak highly enough of her. I really can’t. She has given me hope that things can get better. A true, immense asset to the clinic. I can’t thank her enough."
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Gayle Merchant

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"I had an online meeting with Gayle which was really helpful, much more relaxed than expected whilst including an in-depth exploration of my test results, health issues, and their timeline and effects on my life. Gayle is polite, respectful, understanding, and easy to talk to, as well as thorough and interested to understand and create a full picture. She’s very knowledgeable in a range of areas and made various links between results and possible causes. I look forward to continuing my health improvement with her support."
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Marie Cherrett

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"Marie was so thorough in her review of results and works with you to plan a next steps protocol which is clear and concise. She was empathetic & supportive throughout the consultation"
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Marie Cherrett

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"Marie is a very pleasant and knowledgeable person. It was very easy to talk to her and the level of her expertise gave me a lot of confidence."
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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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