Amanda Callenberg

IBS & Gut Health Nutritionist





Deeper support for women with persistent gut symptoms

4.8 ⭐⭐⭐⭐⭐ Google Rated

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

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

Hi, I’m Amanda

I’m an Australian born, 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

Common Related Concerns:

Fatigue · PMS · Perimenopause · Thyroid Health · PCOS · Stress-Related Symptoms · Food Anxiety

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 takes place through tailored multi-month 1:1 programmes rather than one-off consultations. We begin with weekly sessions to build stability and understanding, gradually moving to a fortnightly rhythm as your body becomes more settled.

Consultations focus on strengthening nutritional foundations, and where appropriate, deeper work to explore the underlying patterns shaping your symptoms.

Regular calls and ongoing guidance between sessions allow your plan to adapt as your body changes, rather than relying on fixed protocols.

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 looks at 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, 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 concerns at once. My work is particularly well suited to complex or persistent cases where standard approaches have offered only limited relief.

Digestive symptoms rarely exist in isolation, and many clients also experience fatigue, hormone-related symptoms, thyroid concerns, poor sleep, or other stress-sensitive health challenges that overlap with their digestive health.

I have extended experience working with clients struggling with:

Learn more about IBS, SIBO, bloating, reflux, and the other digestive and related health concerns 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.

Trusted by clients with long-standing digestive symptoms, fatigue and other persistent health issues that have been difficult to resolve.

“From the very first session, I felt completely comfortable and understood.”
Manny · Google Review ⭐⭐⭐⭐⭐

“Nothing was ever a rush and yet we achieved so much.”
Emma · Google Review ⭐⭐⭐⭐⭐

“Within our first couple of weeks I saw a massive difference and started to feel better.”
Martina · Google Review ⭐⭐⭐⭐⭐

“I had suffered debilitating symptoms since childhood which I now barely suffer at all.”
Emma · Google Review ⭐⭐⭐⭐⭐

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As Seen In

Articles that explore gut health, the nervous system, and the deeper patterns behind ongoing symptoms can be found here.

Quoted in The Independent
I was recently quoted in The Independent contributing to wider conversations on gut health, highlighting the limitations of product-led approaches and the role of stress and nervous system state in digestion.
Read the article →
Invited Contributor to Life Science Daily News
I was invited to contribute to Life Science Daily News, writing about the challenge of translating microbiome research into meaningful patient care.
Read the article →

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.