Amanda Callenberg

IBS & Gut Health Nutritionist

Supporting people with long-standing and stress-responsive gut symptoms that haven’t responded to diets or medication


BANT Registered · CNHC Accredited · Mind-Body-Biome™ Method

Expert in IBS, SIBO and complex gut conditions linked to nervous system dysregulation

4.8 ⭐⭐⭐⭐⭐ Google Rated

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Hi, I’m Amanda

I’m a London-based Gut Health Nutritionist, IBS Nutritionist, and Registered Nutritional Therapist (BANT, CNHC). I specialise in chronic and complex digestive conditions, particularly those involving gut-brain axis dysregulation and stress physiology. My work integrates personalised nutritional therapy, functional medicine, and targeted nervous system support to restore long-term digestive health.

Gut Conditions I Support:

IBS · SIBO · IBD · Bloating · Reflux · Constipation · Diarrhoea · Dysbiosis · Candida · Leaky Gut · Histamine Intolerance · Food Sensitivities

My Approach

Personalised Nutrition · Functional Medicine · Advanced Testing · Nervous System Support (including Compassionate Inquiry-informed approaches) · Somatic Awareness · Experience-Informed Care


MIND - BODY - BIOME


SEE THE PERSON - NOT THE PARTS

Within my 1:1 online clinic, I specialise in helping people living with persistent digestive symptoms, especially those whose issues flare with stress, feel unpredictable, or haven’t improved through conventional routes.

My Mind Body Biome method brings together:

Personalised nutrition - rooted in functional medicine and naturopathic principles.

Compassionate Inquiry - A nervous system-informed approach used to support regulation, stability and symptom resolution in complex gut cases.

Experience-informed care - Acknowledging how your past experiences shape today’s response.

Somatic Awareness - Gentle, body-based support for nervous system balance.

Functional testing (if required) - GI360, SIBO test, DUTCH, blood panels.

This unique combination of approaches helps you build a clearer understanding of your symptoms, explore the less visible influences on your digestion, and uncover the underlying drivers of chronic gut issues.

“This work allows for breakthroughs far beyond nutrition and testing alone.”

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When This Approach is a Good Fit

Some people come to me early, when symptoms are still relatively mild and they want clear, personalised guidance to prevent things becoming more entrenched. Many are looking purely for nutrition-focused guidance, and some are curious about a broader whole-body lens. Everyone benefits from understanding the wider influences on their symptoms.

Others arrive after long-term gut issues have left them feeling discouraged or overwhelmed by how difficult things have become. By looking at nutrition, nervous system patterns, and gut function together, I help make sense of symptoms that previously felt confusing or unpredictable, so they can finally understand what their body has been asking for.

This approach is particularly effective for those who have not found lasting relief through GP routes, medications, or restrictive diets, as well as those who are drawn to a more natural, personalised, whole-body approach, and are open to looking beyond food alone.

 
 

This work is deliberately paced and high-touch, offering far more contact and continuity than most standard nutrition or dietitian practitioners. Depending on plan length, clients receive a minimum of 7-15 hours of direct 1:1 call time, starting weekly and moving to a fortnightly rhythm as the programme progresses.

 

This way of working is especially suited if:

• You want clear, structured support at a pace that feels manageable and stabilising

• You value being properly listened to, not rushed or reduced to a symptom list

• You would like a plan that adapts to how you’re feeling week by week

• You’ve been living with gut symptoms for a long time and feel tired of starting over

• You have already tried the usual routes with only partial or short-term results

• You’ve lost trust in food choices, your body, or the idea that things can improve

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If You Prefer A Quieter Starting Point

Most people who arrive here already sense their symptoms are driven by more than food alone. Although, my work is grounded in nutrition, the heart of my approach involves exploring the other factors that affect digestive health: sleep, stress, daily habits, and how supported your body is overall.

This short quiz explores your digestion, energy levels, stress patterns, and daily demands to help you understand what's really driving your symptoms and where your body needs the most attention.

14 multiple choice questions 2-3 minutes
NO EMAIL REQUIRED

Conditions I Support

I work primarily with people experiencing long-standing digestive symptoms such as IBS, SIBO, IBD, persistent bloating, reflux, constipation or diarrhoea, food sensitivities, histamine reactions, and dysbiosis.

Many of the people I support have symptoms that return despite dietary changes, are not exclusively linked to food triggers, or involve several overlapping gut issues at once. My work is particularly well suited to complex or persistent cases, where standard approaches have offered only limited relief.

I have extended experience working with clients struggling with:

Learn more about bloating, SIBO, reflux, IBS & other gut conditions I support below.

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Get In Touch to Discuss 1:1 Support

Many people come to me after trying “personalised” plans that were still quite formulaic. What I offer is adaptive and relational, shaped in real time around your body, your progress, and your life.

All packages have weekly sessions to begin with, then fortnightly as appropriate.
Minimum 8–14 follow-up calls plus an initial consultation.
Minimum 7–15 hours of direct 1:1 call time depending on programme duration,
allowing your plan to adapt as your body changes rather than relying on fixed protocols.
WhatsApp and email support between sessions.

  • 1. What does a gut health nutritionist do?

    As a gut health nutritionist, I help people understand the root causes of digestive symptoms such as IBS, SIBO, bloating, reflux, constipation and food reactions. Using personalised nutrition and a nervous system-aware approach, with functional testing used where helpful, I create tailored plans that support long-term digestive healing.

    2. Do you work with IBS and SIBO?

    Yes. IBS and SIBO are two of my main areas of expertise. I use a combination of evidence-based nutrition and nervous system support, with functional testing such as SIBO breath tests and GI360 used where helpful, to reduce symptoms and address underlying imbalances.

    3. Do you offer online consultations?

    Yes. My clinic is fully online, supporting clients across London, and the UK. All sessions take place via Zoom and packages include between-session support.

    4. What types of functional tests do you use?

    Depending on your symptoms, I may recommend tests such as the GI360, GI-MAP, SIBO breath test, DUTCH hormone test or targeted blood panels. Testing is always optional and guided by your case, symptoms and goals.

    5. Is your approach suitable for people whose symptoms worsen with stress?

    Absolutely. Many clients come to me because their digestion is closely linked to stress, or overwhelm. My Mind–Body–Biome™ method integrates nutritional therapy with nervous system support to improve both digestion and overall regulation.

    6. What kinds of symptoms or conditions do you support?

    I work with IBS, SIBO, bloating, reflux, constipation, diarrhoea, dysbiosis, Candida, leaky gut, histamine intolerance, hormone-related digestive symptoms and food sensitivities.
    A complete list is available on my Conditions I Support page.

    7. How do I know if we’re the right fit?

    If you have long-standing digestive symptoms, feel your gut reacts strongly to stress, or haven’t found answers through GP routes or restrictive diets, my approach may be a good match. You’re welcome to book a free call to ask questions and explore whether working together feels right.

    8. How do your programmes differ from most gut health support?

    Most gut health support is short-term and protocol-led. My programmes are designed for complex, long-standing symptoms and real life healing, not quick fixes.

    • Weekly sessions at the start, not monthly check-ins

    • Minimum of 8–14 follow-up calls (plus an initial consultation), depending on programme length

    • Multi-month continuity, not short protocols

    • Nervous system informed care built into every session

    • Real-time plan adjustments based on symptoms, tests, and capacity

    • Ongoing WhatsApp and email support between sessions

    • Specialism in complex and chronic cases

    • Focus on long-term outcomes, not temporary symptom control

Trusted by clients with long-standing IBS, SIBO, reflux and unexplained digestive issues.


“I finally understood why my symptoms kept returning.”

“I felt properly listened to for the first time.”

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As Seen In

Work With Me

Press - for articles, interviews, and professional collaboration.

Mind-Body-Biome - to explore my signature 1:1 method for lasting gut health.

Mentorship - for practitioners who want to become more attuned, embodied, and effective in their work.

Please Note - My work is intentionally 1:1 and not offered in corporate or group formats.