Amanda Callenberg

IBS & Gut Health Nutritionist

Home of the Mind–Body–Biome™ Method

BANT Registered · CNHC Accredited

Expert in IBS, SIBO, functional testing and stress-related gut conditions

4.8 ⭐⭐⭐⭐⭐ Google Rated

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Hi, I’m Amanda

I’m a London-based Gut Health Nutritionist and IBS Nutritionist, and Registered Nutritional Therapist (BANT, CNHC). I specialise in the gut–brain connection and chronic gut symptoms that are driven by nervous system dysregulation, emotional patterns, and past experience - facilitating healing through trauma-informed care, somatic awareness, nutritional therapy and functional testing.

Gut Conditions I Support:

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

My Approach

Personalised Nutrition · Functional Testing · Mind–Body Support · Trauma-Informed Care · Compassionate Inquiry

 
Amanda Callenberg, London-based gut health nutritionist specialising in IBS, SIBO and stress-related digestive issues.

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


My method brings together:

  • Personalised nutrition - rooted in functional medicine and naturopathic principles.

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

  • Compassionate Inquiry - A therapeutic approach to body and emotional awareness.

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

Through this unique combination of approaches, my Mind–Body–Biome Method helps you gain clearer insight into your body, better interpretation of your symptoms, and a deeper understanding of the hidden drivers of chronic gut issues.

This work allows for breakthroughs far beyond nutrition and testing.

 
 
 

Who I Help

I help people living with digestive symptoms that feel confusing, reactive, or closely linked to stress. Whether you’re seeking solely nutrition-focused guidance or open to deeper mind–body exploration, I bring clarity to what’s really going on in a way that feels safe, reassuring, and helps you feel truly understood.

My work is especially suited to those who haven’t found lasting relief through GP routes, medications, or restrictive diets, and who sense their healing involves more than food alone.

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 and deep transformational work.

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

 
  • 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, functional testing and a trauma-informed, mind–body approach, I create tailored plans that support long-term digestive healing - never generic diets.

    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, functional testing (such as SIBO breath tests and GI360), and nervous-system support to help 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, overwhelm or emotional load. My Mind–Body–Biome™ Method integrates nutritional therapy with trauma-informed, mind–body tools to support both the gut and the nervous system.

    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.

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