Dietitian vs nutritionist: what’s the difference in the UK and Ireland?

Two titles cause most of the confusion. Here’s how they compare. A plain “nutritionist” with no register behind the title isn’t in the table, because there’s nothing to compare: anyone can use that word, with or without training.

No. Both work with food and health, and both should base their advice on evidence, but they differ in three ways that matter when you’re choosing who to see.

• Regulation. Dietitians are regulated by law. The British Dietetic Association (BDA) and the Irish Nutrition and Dietetic Institute (INDI) both describe dietitians as the only nutrition professionals regulated this way. Registration for nutritionists is voluntary.
• Training. A dietitian has completed a dietetics degree or postgraduate qualification approved by the regulator, with supervised practice. In the UK, the BDA says this includes 1,000 hours of training in practice. A Registered Nutritionist has degree-level knowledge of nutrition science, usually from a degree accredited by the Association for Nutrition (AfN).
• Scope. Dietitians assess, diagnose and treat diet and nutrition problems, including for people who are unwell. Registered Nutritionists mostly work on healthy eating, preventing disease, public health, food and sport.

Because “nutritionist” isn’t a protected title, a dietitian can also call themselves a nutritionist. It doesn’t work the other way round.

Yes, in both the UK and Ireland. A protected title is one the law reserves for people on a statutory register, so nobody can call themselves a dietitian just because they’ve taken a course or read widely.

You’ll also see the word spelled “dietician”. Both spellings are protected: the HCPC lists “dietitian” and “dietician” among its protected titles, and CORU protects “dietitian/dietician” in the same way.

In the UK: the HCPC

Dietitians in England, Scotland, Wales and Northern Ireland are regulated by the Health and Care Professions Council (opens in a new tab). The HCPC keeps a public register of professionals who meet its standards for training, professional skills, behaviour and health, and you must be on it to use the title.

The law behind this is the Health Professions Order 2001 (opens in a new tab). Under article 39, it’s a criminal offence to use a protected title you aren’t entitled to, or to claim to be on the HCPC register when you aren’t, with intent to deceive. The HCPC investigates misuse of its titles and can prosecute.

In Ireland: CORU

In Ireland, dietitians are regulated by CORU, the regulator for health and social care professionals, through its Dietitians Registration Board (opens in a new tab). Dietitians are one of the professions designated under the Health and Social Care Professionals Act 2005. CORU’s register of dietitians opened on 31 October 2014, and the title became protected on 31 October 2016.

In CORU’s words, “Only a person whose name appears on the Register may use the associated title.” Section 79 of the Act, as amended, sets out who may use the title, with a narrow exception for some qualified professionals from abroad working in Ireland on a temporary and occasional basis. Section 80 makes misuse a criminal offence, punishable by a fine, up to six months in prison, or both.

Yes. In both the UK and Ireland, “nutritionist” is not protected by law, so anyone can use it, whatever their training. The Association for Nutrition says so in its own registration guidance, and INDI makes the same point for Ireland.

That doesn’t mean everyone using the title is unqualified. Many nutritionists have nutrition science degrees and years of experience. It means the word on its own tells you nothing about someone’s training, so look for a register behind it.

The same goes for titles such as “nutrition expert”, “diet expert” and “nutrition consultant”. The BDA points out that these aren’t regulated, by law or voluntarily, so the people using them can’t describe themselves as registered. It also notes that belonging to a professional association isn’t the same as being registered with a regulatory body.

A Registered Nutritionist is on the UK Voluntary Register of Nutritionists (opens in a new tab) (UKVRN), which the Association for Nutrition runs. The register has two main levels.

• Registered Associate Nutritionist (ANutr). Has at least honours-degree level knowledge of nutrition science and works with professional support while building experience. Graduates of AfN-accredited degrees can apply directly within three years of graduating.
• Registered Nutritionist (RNutr). Has also shown, through a portfolio, that they apply nutrition science consistently and independently in a specialist area: animal nutrition, food, nutrition science, public health, or sport and exercise. Associate Nutritionists usually apply to transfer once they have three or more years of professional experience.

Every registrant must follow the AfN’s Standards of Ethics, Conduct and Performance and keep their knowledge up to date. The AfN investigates concerns about registrants, and any current sanctions are shown on the register.

Registration is voluntary. The AfN itself is clear that “nutritionist” isn’t regulated by law, so joining the UKVRN is a choice a nutritionist makes to show they meet its standards. There’s no separate register of nutritionists in Ireland, and INDI notes that suitably qualified nutritionists there can join the UKVRN.

No. They’re different jobs, with different registers and training, even though both titles mention nutrition. And just like “nutritionist”, anyone can call themselves a nutritional therapist, with or without training: the title isn’t protected by law in the UK or Ireland.

Nutritional therapy is a complementary therapy. The Professional Standards Authority (opens in a new tab) (PSA), the independent body that oversees the UK’s statutory health and care regulators, notes that it isn’t regulated by law. Nutritional therapists can choose to join a voluntary register held by the Complementary and Natural Healthcare Council (CNHC), which was set up with government support and whose register is accredited by the PSA. People on it can call themselves registered nutritional therapists.

To join, practitioners need training that meets the National Occupational Standards and the CNHC’s core curriculum for nutritional therapy, or must show the same level of competence through experience and assessment. Professional associations, including the British Association for Nutrition and Lifestyle Medicine (BANT), check applicants’ training, insurance and experience on the CNHC’s behalf.

The CNHC describes nutritional therapy as applying nutrition science to promote health and support individual care, through personalised nutrition and lifestyle programmes. It says practitioners never recommend it as a replacement for medical advice, and refer anyone with red-flag signs or symptoms to a medical professional. The BDA adds a note of caution: some approaches used in nutritional therapy may draw on complementary medicine, which isn’t part of conventional medicine and has little robust scientific evidence behind it.

Put simply, a Registered Nutritionist is registered for their knowledge of nutrition science, while a registered nutritional therapist is registered to practise a complementary therapy. In Ireland, INDI notes that the title “nutritional therapist” isn’t regulated. CONNECT lists Registered Dietitians and AfN-registered nutritionists only.

It depends on the help you need. If you need dietary treatment for a medical condition, the professional trained and regulated to provide it is a dietitian.

Dietitians assess, diagnose and treat diet and nutrition problems, working with people who are well and people who are ill. NHS Health Careers (opens in a new tab) gives examples including digestive problems, allergies, eating disorders and needing to put weight back on after an illness. Dietitians work in hospitals and community services across the NHS and the HSE, as well as in private practice, and INDI notes that they’re the only nutrition professionals the HSE employs to work in hospitals and the community. If you see your GP about a condition such as irritable bowel syndrome, they may refer you to a dietitian.

Registered Nutritionists can work one to one with clients, for example on healthy eating, reducing the risk of disease, managing weight or improving sports performance. The AfN’s guidance is that someone who needs dietary support to manage or treat an active medical condition should normally be referred to a regulated health professional, such as their GP.

A Registered Nutritionist can still work with that person on their condition if they’re also qualified in a regulated profession, or as part of a team where a GP or a dietitian, for example, leads the clinical care. They can also give advice that isn’t about the condition itself, as long as it doesn’t conflict with the person’s treatment and their GP is kept fully informed.

Start with what you want help with.

When to see a dietitian

• You have a diagnosed medical condition and want help with what you eat as part of managing it.
• You’ve been advised to follow a special diet as part of treatment.
• You have ongoing digestive problems, a food allergy, or difficulty keeping weight on, and you’ve already seen your GP.
• You have, or think you might have, an eating disorder. A dietitian can be part of your care alongside your GP and specialist services.

When a Registered Nutritionist can help (and so can a dietitian)

• You want evidence-based advice on eating well.
• You want to manage your weight and don’t have a related medical condition.
• You want nutrition support for sport and exercise.
• You want practical advice on lowering your risk of diet-related disease.

Questions to ask before you book

• Which register are you on, and what’s your registration number?
• Have you worked with people in a situation like mine?
• If what I need is outside your expertise, will you tell me and suggest who can help?

A registered professional will be happy to answer all three.

Every register is public and free to search. Ask the practitioner which register they’re on and for their registration number, then look them up:

• Dietitians in the UK: the HCPC register (opens in a new tab)
• Dietitians in Ireland: the CORU register (opens in a new tab)
• Registered Nutritionists in the UK or Ireland: the AfN register (UKVRN) (opens in a new tab)

Our step-by-step guide, How to check a dietitian or nutritionist is registered, explains what a valid entry looks like, the red flags to watch for, and what to do if you can’t find someone.

FoodFacts CONNECT lists two kinds of professional: Registered Dietitians on the HCPC or CORU register, and Registered Nutritionists on the AfN’s UKVRN. Before any profile is published, a member of our team looks the practitioner up on the official register by hand and checks that their name, registration number and current status match. If we can’t verify someone, their profile isn’t published.

Every profile shows which register the practitioner is on, so you can check it yourself too. There’s more about our checks on how CONNECT works.