Amanda Callenberg
Mind-Body-Biome Functional Testing Nervous System Aware Pricing
Conditions IBS SIBO Bloating Reflux More
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Amanda Callenberg

IBS & Gut Health Nutritionist

Home of the Mind–Body–Biome™ Method

BANT Registered · CNHC Accredited

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 supporting people with chronic and complex digestive conditions - particularly cases involving dysregulation of the gut–brain axis and stress physiology - using nutritional therapy, functional medicine and targeted nervous system support to restore long-term digestive health.

Gut Conditions I Support:

IBS · SIBO · 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 others are curious about a broader whole-body lens, but 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. I help bring clarity to what is happening in your body, and guide change in a way that feels steady, supportive, and realistic to sustain.

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 from the beginning, 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 programmes. Depending on programme 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 stablilising

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

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

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

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

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

 

Most people who arrive here already sense there is more shaping their symptoms than food alone. Although my work is grounded in nutrition, the heart of my approach involves exploring the other factors that shape digestive health; the daily demands on your body, patterns that may have developed over time and how your gut is functioning.

This short quiz is designed to help shine a light on where you are right now, whether you are mainly looking to rebuild your digestion, need support for symptoms that feel more reactive, or sense there may be deeper patterns involved.

Take The Mind Body Biome Gut Health Quiz

• 12 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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Working Together

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.

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

More Testimonials
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As Seen In

 

Get In Touch to Discuss 1 on 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.
WhatsApp and email support between sessions (package dependent).

  • 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

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