If you’ve searched for help with your IBS, you’ve probably noticed there are various kinds of nutrition professionals. Should you see a nutritionist or a dietitian for IBS, how can you trust them and what is the difference?
This article explains what each profession does, how they’re regulated in the UK, what they can and can’t do, and how to work out which one is right for you. I’m writing this because it’s quite confusing, and it’s hard to know who to trust.
Heads up: I’m writing it as a registered nutritional therapist who has worked with hundreds of IBS and SIBO clients for over a decade. I’m an author and prominent podcaster for people with IBS. Basically, I have a stake in the answer, but I’ll try to be impartial.
(To make things more complicated (!) I do sometimes call myself a nutritionist because I find that’s what people understand, so officially I’m a nutritional therapist, but online I normally say nutritionist.)
The short answer
If you want to skip to main points, here they are:
- A Registered Dietitian (RD) is a legally protected title in the UK. They’ve trained clinically and can work with any medical condition, including IBS, and work within the NHS.
- A registered nutritional therapist (like me) is regulated by the Complementary and Natural Healthcare Council (CNHC) and by British Association for Nutrition and Lifestyle Medicine (BANT). We work with food-first approaches to chronic conditions including IBS and SIBO, normally in private practice.
- Registered nutritionists (AfN) can also with with individuals who have health conditions; many work in public health roles, research, private practice or commercial settings advising on the impacts of food and nutrition.
- The word “nutritionist” on its own is not legally protected, and some nutritionists have only had a few weeks/months training before starting a business.
The key differences at a glance
Here’s how a dietitian, registered nutritionist and a registered nutritional therapist compare, in the things that you will want to know:
| Registered Dietitian | Registered Nutritionist (ANutr or RNutr) | Registered Nutritional Therapist | |
| Legally protected title | Yes | Yes | Nutritional Therapist is not protected, but BANT and CNHC registration is verifiable |
| Training | BSc or MSc (3 to 4 years, clinical placements) | BSc or MSc (3 years, may not include clinical placements) | 3 years of clinical training in nutritional therapy |
| Regulator | HCPC | Association for Nutrition | CNHC (accredited by Professional Standards Authority) and BANT |
| Can work with medical conditions | Yes, including IBS | Yes to supporting symptoms rather than medical management of a condition | Yes to supporting symptoms rather than medical management of a condition |
| Typical engagement length | A few sessions on the NHS, privately may have longer programmes | Varies | Varies |
| Available on NHS for IBS | Yes, with GP referral | Privately only | Privately only |
| Typically covered by insurance | Often yes (Bupa, AXA, Vitality) | Some may be covered | Sometimes for CNHC-registered practitioners |
| Prescribes supplements | Rarely | Rarely | Sometimes, when clinically justified |
What is a dietitian?
‘Dietitian’ is a legally protected title in the UK. You may also see the word ‘dietician’ used online. In the UK, dietitian is the preferred spelling, but both terms refer to the same profession.
To use it, someone has to complete a BSc or MSc in Dietetics and register with the Health and Care Professions Council (HCPC). Training includes physiology, biochemistry, clinical placements in NHS hospitals, and medical nutrition therapy.
Dietitians can work in the NHS, in GP surgeries, hospitals or private practice. They can diagnose nutritional problems, interpret medical tests, and prescribe diets for a very wide range of conditions, from diabetes and kidney disease, eating disorders through to IBS and food allergies. If you’re referred to a dietitian on the NHS, you’ll usually see them for a handful of sessions over a few months, depending on waiting lists in your area.
For IBS specifically, a dietitian is most likely to:
- Take you through a structured low FODMAP diet if that’s the right fit.
- Work within an evidence-based NHS framework.
- Focus on diet as the main lever, with lifestyle as a supporting factor.
- Be available through private health insurance in many cases (Bupa, AXA, Vitality).
What is a nutritionist?
Here’s where it gets quite messy. The word “nutritionist” on its own is not a protected title. Anyone can legally call themselves a nutritionist in the UK, regardless of whether they’ve trained for three years or taken a weekend online course. That’s why the register matters more than the word.
There are two main regulated groups that use the nutritionist title in the UK. These kinds of practitioners do not diagnose or treat disease, and recommendations are not a replacement for medical advice.
Registered Nutritionist (ANutr or RNutr)
Registered with the Association for Nutrition (AfN). Degree-level nutrition qualification, some qualifications don’t involve clinical experience (working with individual clients) and focus more on public health.
Qualified to work with health conditions and individuals. Often they work in public health, the food industry, research, or in private practice with clients.
Registered Nutritional Therapist (mBANT, CNHC)
This is me. Three years of clinical training in nutrition science, registered with the British Association for Nutrition and Lifestyle Medicine (BANT) and the Complementary and Natural Healthcare Council (CNHC). I’m a registered nutritionist mBANT and a Registered Nutritional Therapist.
The CNHC is accredited by the Professional Standards Authority, which is the same body that oversees the HCPC, where dietitians register.
We can work with chronic health conditions including IBS and SIBO, looking at the whole picture (diet, lifestyle, stress, sleep, and digestive processes).
For IBS specifically, a registered nutritional therapist is most likely to:
- Work with you over a longer period (usually three months or more) rather than a few sessions.
- Use a mix of approaches depending on what’s driving your symptoms: low FODMAP if appropriate, but also meal timing, stress and sleep, and SIBO, if relevant.
- Tailor to your symptoms and history rather than applying a fixed protocol.
- Typically not be covered by most UK private health insurance, though this is changing for CNHC-registered practitioners.
Who is better for IBS?
The answer you get depends on who you ask. Dietitian websites will tell you dietitians are the only properly qualified option. Some nutritionist websites will tell you nutritionists are better because they are more holistic. In reality, both can help. It depends a bit on your situation, finances, symptoms and needs.
An NHS dietitian may be a good fit if:
- You’d like a dietitian integrated with your doctors and are willing to wait for it.
- You have private health insurance that covers dietetic consultations.
- You have multiple medical conditions and want someone working in the NHS.
A private IBS specialist may be a good fit if:
- You’ve already tried the standard low FODMAP route and it didn’t fully resolve things.
- You’ve been told it’s IBS, but you feel there may be additional factors contributing to your symptoms, such as small intestinal bacterial overgrowth (SIBO), bile acid diarrhoea, gut motility issues, food intolerances or other digestive concerns.
- You want longer, more personalised support over a few months rather than a handful of short sessions.
- You want a practitioner who looks at diet, stress, sleep, eating habits and lifestyle alongside digestive symptoms.
This could be a registered nutritional therapist, registered nutritionist or specialist private dietitian.
In all cases, it’s important thing is that the person you choose specialises in IBS or SIBO. A generalist dietitian who mainly works with diabetes is not going to be more useful to you than an IBS-specialist registered nutritional therapist.
Red flags when choosing help for IBS
No matter which you go for, the following should put you off. I’ve seen a lot of crazy claims online, from all kinds of practitioners.
- Promising a cure: IBS and SIBO can improve dramatically but ‘cure’ is rarely the right word. Anyone guaranteeing it is overselling.
- Expensive tests pushed upfront: £300 to £500 of tests in the first appointment, before you’ve even discussed your symptoms properly. Some tests are genuinely useful. A blanket panel for every new client isn’t clinical practice, it’s a way for them to get commission. (I don’t take commission on any test that I recommend for you)
- Long supplement stacks on day one: Five, ten or more gut supplements prescribed in the first consultation. Good practice is to start small, use evidence based, targeted supplements only when clinically justified, and always explain why.
- One-size-fits-all elimination: If your practitioner gives everyone with IBS the same diet handout, it’s probably not tailored to you enough.
- Dismissing evidence-based or functional medicine without thought: Individual practitioners vary considerably in their approach. Some focus heavily on dietary interventions, while others incorporate a wider range of lifestyle and behavioural strategies.
Green flags to look for
- Verifiable registration: Registered with BANT, CNHC, HCPC (for dietitians), or AfN. All are publicly searchable registers.
- Named specialism in IBS or gut health: IBS, SIBO, gut health, bloating, digestion. Not just general nutrition, hormones, or weight loss.
- Flexible methodology: Low FODMAP where appropriate, other approaches where it isn’t. Someone who says they have one answer like plant based, keto or gluten free for every client might not be very helpful for you.
- Asks about you before recommending anything: A practitioner who asks about your symptoms, medical history, eating patterns, sleep and stress before telling you what to do.
- Offers a free discovery call: Most good practitioners offer a short, free discovery call. Use it to ask questions and see if you’d actually want to work with this person for three months.
- Published work or client evidence: Case studies, testimonials, articles, podcast appearances, published books. You want someone who is actively engaged with the field, not just someone with a register number.
What to ask before you book
Whatever you choose, these are the five questions worth asking on a discovery call. The answers will tell you far more than the title on the business card.
- What percentage of your caseload is IBS or SIBO? The answer should be specific. “Most of my clients have IBS or SIBO” is a good answer. “I see a range of people” means their focus could be quite broad.
- What’s your approach to IBS? Look for an answer that includes more than just the low FODMAP diet. A good IBS practitioner works across food, gut motility, stress, sleep, and sometimes supplements.
- Do you work in packages or single sessions? A package is usually better for IBS because the condition doesn’t resolve in one appointment. But you should be able to see exactly what’s included in the price.
- Do you recommend tests, what do they cost, and what are they for? Be cautious of anyone who encourages a stool test or suggests a SIBO test before understanding your history, or explaining how the results will change the approach.
- How quickly should I expect to see improvements? This is difficult because it depends on how much change you’re able to make, and what the symptoms are. Most IBS cases should show some improvement within one to three months, but being realistic if you’ve had a condition for years it won’t go overnight.
Common questions
Can a nutritionist help with IBS in the UK?
Yes. NICE guidelines suggest dietary management for IBS as part of the first line management techniques.
A registered nutritional therapist registered with CNHC can support people with chronic conditions including IBS, as long as they’re not claiming to diagnose, cure or override medical advice. Many nutritional therapists work alongside medical practitioners. The important part is that the nutritionist or nutritional therapist is properly registered. An unregulated ‘nutritionist’ is a different matter.
Nutritionist vs dietician for IBS – which is cheaper?
Costs will vary. Private dietitians and nutritional therapists in the UK often charge £100 to £250 for an initial consultation and £80 to £200 for follow-ups. Nutritional therapists vary more widely because many work in packages that include between-session support, meal plans and protocol adjustments.
If you’re comparing purely on an hourly rate, a dietitian on the NHS is free, but the waiting list may be months.
Can I see a nutritionist on the NHS?
Not usually. The NHS route for IBS is a GP referral to a dietitian or a gastroenterologist. Nutritional therapists mostly only work in private practice.
Do dietitians and nutritional therapists both use the low FODMAP diet?
Yes. Many nutritional therapists, including me, are trained in the low FODMAP diet by Monash University, the group that developed it. Check that your practitioner has more than one approach to IBS diets.
Can I switch between them if one isn’t working?
Absolutely. A lot of my clients come to me after a period with a dietitian. The main thing is finding someone whose approach matches where you are now, and who you feel comfortable talking about your bowel habits with!
Is a dietitian better than a nutritionist for IBS?
No. Just the title ‘dietitian’ doesn’t make someone better for you than a qualified registered nutritional therapist.
Should I see a dietitian or nutritionist for bloating?
Yes, getting personalised help for your digestion can be life changing. First it’s important to see a doctor to have some basic checks on your digestion. If they have ruled out other conditions and tell you it’s IBS, then it can be time to get some specialist dietary help for bloating.
Can a nutritionist diagnose IBS?
No nutritional therapists or nutritionists cannot diagnose medical conditions, this should come from a doctor.
Can a dietitian help with SIBO?
Some dietitians have extensive experience supporting people with SIBO, while others focus on different areas of digestive health. It’s worth asking about their experience before booking.
Nutritionist vs dietitian for IBS
If you’re looking for NHS-supported care, ask for a referral from your GP or gastroenterologist.
If you’ve already tried standard IBS approaches and want longer-term, personalised support that considers diet, lifestyle, stress, gut motility and SIBO, a registered nutritional therapist may be a better fit.
The most important factor is not the title. Qualifications and training are essential, but if we take that as a given, it’s whether the practitioner specialises in IBS, whether they work in a way that suits your situation, and whether you feel listened to on the first call.
If you want to talk through whether working with a Registered Nutritional Therapist is right for you, I offer a free 30-minute discovery call. We can talk about what you need help with, and I can tell you more about what I do over 3 months.
IBS Nutritionist
Hi, I’m Anna Mapson, registered Nutritional Therapist.
I help people with IBS and SIBO get control of unpredictable gut symptoms to find long term relief from painful and embarrassing symptoms without restrictive dieting.
I can help you to:
- understand your digestion better, so you recognise your triggers
- eat a well balanced diet, with tasty meals that are simple to prepare
- reintroduce your trigger foods so you can get back to enjoying food again
Find more about my 3 month 1:1 Gut Reset programme.
