Dietitian / nutritionist — tasks, one by one

Assessing what someone eats

Apps can now recognise food in photos, but recognising is not measuring. In a comparison of seven apps with AI photo recognition, the best identified 97% of food components, the worst 46%, and the authors found automatic energy estimates inaccurate.

One study of consumer apps on a small set of images; it does not measure dietitians' assessments or clinical outcomes.

Medical nutrition therapy

Models know the textbook but not the patient. GPT-4o answered about 92% of 1,050 US registered-dietitian exam questions correctly, and on 599 questions from Japan's national dietitian exams the best model scored 83.5%, with limited performance on numerical questions.

Exam questions are not patients; neither study tests calculation or guidance for a real person.

Writing individual meal plans

Drafting is easy for AI; getting the numbers right is not. When five AI models wrote 60 three-day plans for adolescents, none stayed consistently close to the dietitian's reference plan across all nutrients, and the authors say the plans are not appropriate to use without professional oversight. Dietitians in one UK hospital team describe asking AI for condition-specific meal plans with regional foods in the patient's language.

Lab comparisons for particular profiles and one team's account; neither measures meal plans in practice.

Counselling and education

In writing, AI already answers well. In a blinded study, eight registered dietitians rated ChatGPT-4o's answers to 100 forum questions higher than dietitians' own forum answers for quality (4.48 against 2.56 out of 5) and empathy. What that does not show is the long relationship that changes behaviour.

Forum answers are not counselling sessions, and the raters judged text, not outcomes.

Menu planning for institutions

This is the most rule-bound task, and software is taking the drafting. A Japanese food-service operator that piloted an AI menu planner estimates it could cut about 70% of menu-planning work, with a registered dietitian checking the menus; the service went on sale in May 2026 for care homes and nurseries. Japan's Health Promotion Act still requires designated feeding facilities to employ a registered dietitian.

The 70% is one operator's own estimate, the product covers standard diets only, and a vendor describes its own product.

Notes, letters and documentation

This is where dietitians already use AI. In a survey of 497 dietitians in Taiwan, 59.8% had used ChatGPT, mainly for administrative documentation. Three diabetes dietitians at a UK hospital write that an AI scribe has cut the time they spend on notes and letters, which they find accurate and appropriate 90% of the time, and that the clinician must still review every output.

A convenience-sample survey and one team's impression; neither measures time saved or errors.