Dietitian vs nutritionist vs endocrinologist: differences and who to see

When someone wants to eat better, lose weight or manage a condition related to what they eat, they are often unsure which of two appointments to book: one with a dietitian or nutritionist, or one with an endocrinologist. They are not in competition. They are different professions, with different training, and they often work together.

Dietitian-nutritionist: the regulated healthcare profession in nutrition

In Spain, the dietitian-nutritionist is a healthcare professional recognised under the Healthcare Professions Act. To practise, they need a degree in Human Nutrition and Dietetics, a four-year university qualification.

Their work focuses on food as a tool for health, both in healthy people and in people with an illness:

• They assess nutritional status: habits, medical and dietary history, and body measurements.
• They design eating plans tailored to the person, their stage of life, their goals and, where there is one, their condition.
• They provide nutrition education: they teach you how to organise your meals, read food labels or plan menus.
• They support the change in habits with regular follow-up appointments.

They work in clinics, hospitals, public health, institutional catering, sport or research. Their diagnosis is a nutritional one: they do not diagnose diseases or prescribe medicines, and when they suspect that a symptom may be due to a medical problem that has not been investigated, they refer you to a doctor.

Dietitian, nutritionist, dietetics technician: what each term means

Is there a difference between a dietitian and a nutritionist? In most cases, no. In everyday language people talk about “dietitians” and “nutritionists” as if they were two professions, but there is only one university qualification and its official name joins the two words: dietitian-nutritionist. The confusion arises because there is another qualification, a vocational one, which is sometimes also called “dietitian”.

Both qualifications, the university one and the vocational one, are official and belong to the healthcare field. By contrast, titles such as “nutrition coach” or “wellness adviser” do not correspond to any regulated healthcare qualification, so on their own they say nothing about the training of the person using them.

Nutritionist or endocrinologist: what each does and when to see which

An endocrinologist is a doctor. After a degree in Medicine, they complete four years of training as a resident (MIR) in Endocrinology and Nutrition. They deal with diseases of the hormone-producing glands and of the metabolism: the thyroid, diabetes, obesity as a disease, or disorders of the pituitary and adrenal glands, among others. They diagnose, order tests, prescribe treatment and provide medical follow-up.

In short: the endocrinologist diagnoses and treats the disease, and the dietitian-nutritionist works on your diet, which in many of those diseases is an essential part of treatment. As a guide:

When to book an appointment with a dietitian-nutritionist

• You want to learn to eat more healthily or get your mealtimes and menus in order.
• You want to lose weight and there is no illness complicating it, or it has already been diagnosed and is being monitored.
• You have a diagnosis, such as high cholesterol, type 2 diabetes, coeliac disease or a confirmed intolerance, and need to adapt your diet.
• You are at a stage of life with its own needs, such as pregnancy, breastfeeding, childhood or older age, you do sport or you follow a vegetarian diet.

When to see an endocrinologist

• You have symptoms that may point to a hormonal problem: unexplained changes in weight, severe tiredness that does not go away, great thirst and needing to pass urine often, or a lump in the neck.
• A blood test shows abnormal glucose or thyroid hormone levels.
• You have diabetes and need your treatment reviewed or adjusted.
• You have obesity with other associated conditions, or treatment with medication or surgery is being considered.

If you have symptoms and do not know where to start, the sensible thing is to see your GP first, who will assess whether tests are needed and point you towards the right specialist.

When they work together

In many situations, the best option is not to choose but to combine. The endocrinologist establishes the diagnosis and the medical treatment, and the dietitian-nutritionist turns the recommendations into a realistic eating plan and supports the change in habits. This is common in:

• Diabetes, including the kind that develops during pregnancy.
• Obesity, especially when there are other associated conditions or treatment with medication or surgery.
• Malnutrition or unwanted weight loss caused by an illness.
• Eating disorders, in which the mental health team is also involved.

In hospitals, clinical nutrition is precisely a team effort between doctors and dietetics professionals. And, depending on the case, others join in: the GP, the gastroenterologist, the paediatrician or the psychologist.

How to check that a professional is qualified

Before starting with any nutrition professional, it is sensible to check their training. A few pointers:

• Ask about their qualification and their registration number. Dietitian-nutritionists belong to regional professional colleges, and doctors, endocrinologists included, register with the college of physicians in their province.
• Look them up in the college register. Through their online one-stop service, professional colleges provide a register of members that anyone can search.
• Be wary of promises. A healthcare professional does not promise that you will lose a set number of kilos within a set time, does not base treatment on selling their own products and does not suggest the same diet for everyone.

Checking takes a few minutes and gives you peace of mind about who is going to guide something as important as your diet.

If you want to get your eating on track or need to adapt it to a diagnosis, on our Nutrition page you will find out how our clinic works and how to book an appointment.