Mast Cell Activation Syndrome (MCAS) Nutritionist
A personalised, integrated approach to MCAS including nutrition, supplements, lifestyle and symptom support
MCAS Nutritionist: Integrated Support for Mast Cell Activation Syndrome
If you're living with Mast Cell Activation Syndrome, you'll know how exhausting it is to navigate a condition that many practitioners don't fully understand, let alone treat.
I'm Keris Marsden, a specialist nutritionist based in the UK, and I also have MCAS.
Before I discovered this I was diagnosed with early menopause, Irritable Bowel Syndrome, PCOS, Reflux, Chronic Gastritis, Silent Reflux (LPR), Small Intestinal Bacterial Overgrowth (SIBO), sinusitis and more.
I visited multiple medial professionals including Gastroenterologists, Ear nose and throat specialists, Endocrinologists and Dieticians.
I tried every alternative route including Herbalists, Functional Medicine Practitioners, Osteopaths, Physiotherapists and Acupuncturists.
I now support many clients with MCAS within my practice.
The symptoms are real, complex, and deeply intertwined with your gut, immune system, hormones, and nervous system.
They require a highly personalised plan that covers all aspects of your health.
What is MCAS
Mast Cell Activation Syndrome is a condition in which mast cells — immune cells found throughout your body — activate too easily and too often, releasing chemicals that trigger a wide range of symptoms. These can include:
• Gut issues: bloating, nausea, diarrhoea, abdominal pain
• Skin reactions: flushing, hives, itching, rashes
• Neurological symptoms: brain fog, headaches, anxiety, insomnia
• Respiratory symptoms: congestion, shortness of breath
• Fatigue and post-exertional malaise
• Food sensitivities and histamine intolerance
• Joint pain and inflammation
MCAS is increasingly recognised as a common thread in Long Covid, CIRS (Chronic Inflammatory Response Syndrome), and perimenopause — conditions that I also specialise in supporting.
Prices are in USD as payments are processed via Skool, a US platform. Your bank will convert the amount automatically.
What is MCAS
Mast Cell Activation Syndrome is a condition in which mast cells — immune cells found throughout your body — activate too easily and too often, releasing chemicals that trigger a wide range of symptoms. These can include:
• Gut issues: bloating, nausea, diarrhoea, abdominal pain
• Skin reactions: flushing, hives, itching, rashes
• Neurological symptoms: brain fog, headaches, anxiety, insomnia
• Respiratory symptoms: congestion, shortness of breath
• Fatigue and post-exertional malaise
• Food sensitivities and histamine intolerance
• Joint pain and inflammation
MCAS is increasingly recognised as a common thread in Long Covid, CIRS (Chronic Inflammatory Response Syndrome), and perimenopause — conditions that I also specialise in supporting.
Prices are in USD as payments are processed via Skool, a US platform. Your bank will convert the amount automatically.
My Approach
Here’s how I support Clients
1. Targeted medical support
Mast cell stabilising medications were transformative - reducing reactivity and allowing me to reintroduce a wider variety of foods.
2. Nervous system regulation
Practices such as body scans, somatic work, and meditation helped restore a sense of internal safety - a critical, often overlooked factor in chronic illness.
3. Emotional processing & integration
Therapeutic approaches addressing unresolved emotional stress played a significant role in reducing the hyper sensitivity.
4. Strategic nutrition & supplementation
Rather than spending a fortune on supplements to detox mould, reduce inflammation, boost immunity or fight infections, I focused on meeting nutrient needs (the foundation of cellular health) and supporting the infrastructure of the digestive system to promote absorption.
5. Reducing health anxiety & overwhelm
Constant exposure to fear-based narratives (mould, toxins, restrictive food protocols) only heightened my reactivity. Learning to filter this and only take useful information (then let go of the rest) was essential.
6. Integrative frameworks
The work of pioneers such as:
Sam Miller and her emotional education via the YouTube Channel The Great Allowing
Stephen Porges’s Polyvagal Theory
Daniel Siegel and his book “Mindsight”
Richard Schwartz - Internal Family Systems and his book “No Bad Parts”
Gabor Maté - his excellent lectures online and book “When The Body Says No”
Tara Brach - her somatic meditations and book “Radical Acceptance”
Monthly live masterclasses with guest experts in somatic practices (body-based approaches to stress and wellbeing), yoga, neuroscience (understanding your thoughts and emotions), and more.
An exclusive video library, of practical tools to help you regulate, reset, and release what’s been weighing you down.
Group Zoom sessions and guided practices, so you never have to do this alone.
A compassionate community of women who understand: no judgment, no pretending.
The 4-Part Mindful Body Starter Programme designed to cut through the noise, reset your system, and bring you back to yourself.
Prices are in USD as payments are processed via Skool, a US platform. Your bank will convert the amount automatically.
What You’ll Learn
and begin to weave into daily life…
A realistic daily rhythm that restores, not depletes.
Tools to reduce nervous system overload and calm your mind.
Somatic practices to
process emotions safely and fully.
Ways to break unhealthy coping mechanisms and self-sabotage.
Confidence to sustain positive change,
even when life throws curveballs.
Amanda C
“Keris has helped me join some very far apart dots that I would not have managed myself, she’s helped me view ME in a different light - digging right down to work from the bottom up….instead of introducing another nutrition and fitness plan into my schedule that I would have felt guilty for not sticking to…we’re really getting into the nitty gritty surrounding my relationship with food, and exercise, how I use it and why fitness regimes and diet plans always fall by the wayside for me - it’s deeper than the surface stuff….”
The 4-Part Journey
This isn’t theory. It’s a process that works.
Each month you’ll be delivered a selection of educational videos, small lifestyle changes and practical mindbody sessions to guide you through the process in a realistic timeframe.
The community and monthly masterclasses also provide a supportive space and chance to connect with other women on the same path.
| Phase 1 |
|---|
| Destimulate and Create Space |
| Do less, simply! Cut the overload. Strip back the noise. Simplify your routine so your body and mind can actually reset. |
| Phase 2 |
|---|
| I versus Her |
| See yourself clearly. Recognise the patterns, the sabotage, the beliefs that keep you stuck. |
| Phase 3 |
|---|
| Allowing and Experiencing |
| Step into your body. Feel what’s been buried. Experience emotions instead of pushing them down. Begin rebuilding trust with your body and appreciating it for what it carries you through. |
| Phase 4 |
|---|
| Integration |
| Bring it all together into a life that actually fits you. Rooted in authenticity, balance, trust in yourself, and confidence in your body as it is. |
One of the most powerful parts of The Mindful Body Method™ is the chance to work directly with practitioners who normally have waiting lists a mile long. This membership gives you access to their guidance at a price that is intentionally kept affordable. Why? Because both Keris and Sam are in this work for the passion, to change lives, and they don’t want cost to be another barrier to your healing. We already have enough barriers.
Meet Your Team
Keris Marsden
Founder, Nutritional Therapist, Lecturer & Yoga Teacher
Keris has supported clients for over 17 years through chronic illness, body image struggles, emotional eating, weight issues and hormone imbalances. She translates science into compassionate, practical tools that help women feel at home in their bodies. Keris is still living her own healing journey, which makes her work deeply relatable and grounded in real life experience.
Sam Miller
MindBody Practitioner
Sam is a meditation teacher and somatic practitioner who helps people regulate their nervous systems and process unresolved emotions. Her calm, practical sessions guide members towards balance and resilience. She has a waiting list of private clients eager to work with her, and inside this membership you get that same calibre of expertise without the barrier of cost.
Together, Keris and Sam share guidance that is rarely available outside of expensive private practice and they do it with a genuine commitment to your growth and healing.
The Truth
It’s time to stop fighting yourself
and start living fully.
This work isn’t easy, it’s not meant to be. At times it’s messy, emotional, and sometimes confronting. But it’s the only path that leads you back to yourself.
Because deep down, you already know another supplement won’t save you. No more quick fixes. It’s time for something that actually lasts.
Join Today
YouThe Mindful Body Method™ membership is only £39/month ($52.00).
This is not another empty promise. It’s the real work and it changes everything.
Join The Mindful Body Method™ now
and finally find peace with mind, body, and self.
Prices are in USD as payments are processed via Skool, a US platform. Your bank will convert the amount automatically.
Real women. Real shifts.
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“Working with Keris has been transformative, and I know we are not done yet!! For the first time, I am sitting with emotions rather than pushing them down and ignoring them. Instead of doing the same thing that I’ve done over and over again and expecting a different result. Working with Keris has opened my eyes to a brand new (for me) approach to help me combat my emotional eating. I am so excited by the work we are doing and will continue to do together ♥️♥️♥️”
Sarah J
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“Through working with Keris, already I have managed to mentally reframe several roadblocks that were holding me back. The knowledge and expertise that Keris has is immeasurable; it is very difficult in this day and age to find someone with the skill set, kindness and professionalism that she possesses. I am so glad I have made the decision to invest in myself and embark on this journey of working on my wellness with her.”
Fiona N
Frequently Asked Questions
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Anyone looking to feel more connected to themselves and at home in their body. You may be struggling with anxiety, stress, illness, life fatigue, grief, loneliness or simply feel disconnected from yourself.
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The Mindful Body Method is hosted on Skool, a global learning platform that currently processes all payments in US dollars. Although Keris is based in Portugal and most of our community is in the UK and Europe (with a few lovely members from further afield!), Skool uses USD as its default currency.
When you pay, your bank or card provider will automatically convert the amount into your local currency - there are no extra fees or hidden charges. It’s simply how the platform manages payments across different countries.
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Absolutely. Please don't worry if you have no experience at all. The Mindful body Method is designed to take you from exactly where you are to where you need to be, at your own pace. If you have some experience in mindful practices there are more advanced materials available. You will also be able to benefit from further mentoring from expert teachers and being part of a community of like minded individuals.
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Both. Mindful body method provides a 4 part journey that you can work through at your own pace and monthly live sessions with myself and other guest experts that include meditation, yoga and educational talks. All classes are recorded and added to the Skool platform for you to view anytime.
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Yes. The content here can help you build essential life skills and lower your risk of disease in future. The materials will help you improve your confidence, cognitive function, alleviate anxiety, improve self esteem and ensure you build better boundaries.
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Yes, it's a subscription that runs month-to-month. You can cancel or pause at any time and manage your own account within the Skool platform.
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No. The Mindful body Method is not a substitute for therapy or medical care. It is a community offering emotional education, somatic (body based) practices, yoga and meditation.
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It’s helpful to set aside 30-60 minutes to explore the content and your Mindbody practices can be implemented at any moment in your day but having a designed 20-30 minutes is helpful.
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Yes absolutely. The resources are designed to support your body’s natural ability to heal and recover from any challenges. It can work alongside any other treatments or therapies you’re currently using.
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The first thing you will discover is why your struggle to stick to anything. Once you understand this and use Mindbody practices to change it, healthy habits become intuitive and health issues naturally begin to allevaite.
