Dietitian

dieteticsdieticiandietitiansregistered dietitiandieteticdieticianssitologyNutrition and DieteticsRegistered dietitian nutritionistsBachelor of Science in Nutrition and Dietetics
A dietitian (or dietician) is an expert in dietetics; that is, human nutrition and the regulation of diet.wikipedia
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Nutritionist

sports nutritionistnutritionnutritionists
The term "nutritionist" is also widely used; however, the terms "dietitian" and "nutritionist" should not be considered interchangeable — the training, regulation and scope of practice of the two professional titles can be very different across individuals and jurisdictions.
In many countries, a person can claim to be a nutritionist even without any training, education, or professional license, in contrast to a dietitian, who has a university degree, professional license, and certification for professional practice.

Human nutrition

nutritionhuman dietnutritional
A dietitian (or dietician) is an expert in dietetics; that is, human nutrition and the regulation of diet.
In the US, dietitians are registered (RD) or licensed (LD) with the Commission for Dietetic Registration and the American Dietetic Association, and are only able to use the title "dietitian," as described by the business and professions codes of each respective state, when they have met specific educational and experiential prerequisites and passed a national registration or licensure examination, respectively.

Scope of practice

use
The term "nutritionist" is also widely used; however, the terms "dietitian" and "nutritionist" should not be considered interchangeable — the training, regulation and scope of practice of the two professional titles can be very different across individuals and jurisdictions.
In most jurisdictions, health care professions with scope of practice laws and regulations include any profession within health care that requires a license to practice such as physicians, surgeon's assistant, nurses, dietitians, respiratory therapists, physical therapists, occupational therapists, pharmacist and dentists among many others.

Speech-language pathology

speech therapyspeech pathologyspeech therapist
They work as a team with the physicians, physician assistants, physical therapists, occupational therapists, recreational therapists, pharmacists, speech therapists, social workers, nurses, dietetic technicians, and other careers to provide care to patients.
They can provide information and referrals to audiologists, physicians, neonatal specialists, dentists, nurses, nurse practitioners, occupational therapists, rehabilitation psychologists, dietitians, educators, behavior consultants (applied behavior analysis), hospital chaplains/spiritual carers and parents as dictated by the individual client's needs.

Home care in the United States

home carehome health carehome health
Community dietitians work with wellness programs, public health agencies, home care agencies, and health maintenance organizations.
Rehabilitation services may be provided by physical therapists, occupational therapists, speech and language pathologists and dietitians.

Health professional requisites

professional requirementscertification or licensing of health workersHealth care professional requisites
In many countries, only people who have specified educational credentials and other professional requirements can call themselves "dietitians" — the title is legally protected.
Requisites and regulations for other professions, such as paramedics, clinical officers, dietitians, and homeopaths, vary across countries.

Medicine

medicalmedical scienceclinical medicine
Consultant dietitians are those who are in private practice or practice on a contractual basis with health care facilities or corporations, such as used in Australia, Canada and the United States.
Examples include: nurses, emergency medical technicians and paramedics, laboratory scientists, pharmacists, podiatrists, physiotherapists, respiratory therapists, speech therapists, occupational therapists, radiographers, dietitians, and bioengineers, surgeons, surgeon's assistant, surgical technologist.

Health care

healthcarehealth servicesmedical care
They coordinate, assess and plan food service processes in health care facilities, school food-service programs, prisons, restaurants, and company cafeterias.
Allied health professionals, such as physical therapists, respiratory therapists, occupational therapists, speech therapists, and dietitians, also generally work in secondary care, accessed through either patient self-referral or through physician referral.

Parenteral nutrition

total parenteral nutritionTPNintravenous feeding
Clinical dietitians may provide specialized services in areas of nourishment and diets, tube feedings (called enteral nutrition), and intravenous feedings (called parenteral nutrition) such as total parenteral nutrition (TPN) or peripheral parenteral nutrition (PPN).
Ideally each patient is assessed individually before commencing on parenteral nutrition, and a team consisting of specialised doctors, nurses, clinical pharmacists and registered dietitians evaluate the patient's individual data and decide what PN formula to use and at what infusion rate.

Academy of Nutrition and Dietetics

American Dietetic AssociationADAAND
These terms are legally protected, regulated by the Academy of Nutrition and Dietetics which registers and confers professional credentials.
The organization's members are primarily registered dietitian nutritionists (RDNs) and nutrition and dietetic technicians, registered (NDTR) as well as many researchers, educators, students, nurses, physicians, pharmacists, clinical and community dietetics professionals, consultants and food service managers.

Health professional

health care providerhealthcare professionalshealth care professionals
The healthcare workforce comprises a wide variety of professions and occupations who provide some type of healthcare service, including such direct care practitioners as physicians, nurses, surgeons, dentists, physical and behavior therapists, as well as allied health professionals such as phlebotomists, medical laboratory scientists, dieticians, and social workers.

Health and Care Professions Council

Health Professions CouncilHPCHealth and Care Professions Council (HCPC)
In the United Kingdom, dietitians must be registered with the Health and Care Professions Council (HCPC, formerly the Health Professions Council, HPC) in order to be able to work for the National Health Service.

Dietitians of Canada

Dietitians of Canada BC Region
The national professional association in Canada is Dietitians of Canada.
Dietitians of Canada (DC) is the professional organization and "nation-wide voice of dietitians in Canada".

Nutrition

nutrition sciencenutritionalnutritional science
Clinical dietitians may provide specialized services in areas of nourishment and diets, tube feedings (called enteral nutrition), and intravenous feedings (called parenteral nutrition) such as total parenteral nutrition (TPN) or peripheral parenteral nutrition (PPN).
In the US, Registered dietitian nutritionists (RDs or RDNs) are health professionals qualified to provide safe, evidence-based dietary advice which includes a review of what is eaten, a thorough review of nutritional health, and a personalized nutritional treatment plan through dieting.

Allied health professions

allied healthallied health professionalsallied health professional
For example, new categories have been created for delineating "paramedical practitioners"—grouping professions such as clinical officers, clinical associates, physician assistants, Feldshers, and assistant medical officers—as well as for community health workers; dietitians and nutritionists; audiologists and speech therapists; and others.

Diet (nutrition)

dietdietarydiets
A dietitian (or dietician) is an expert in dietetics; that is, human nutrition and the regulation of diet. Clinical dietitians may provide specialized services in areas of nourishment and diets, tube feedings (called enteral nutrition), and intravenous feedings (called parenteral nutrition) such as total parenteral nutrition (TPN) or peripheral parenteral nutrition (PPN). Dietitians supervise the preparation and service of food, develop modified diets, participate in research, and educate individuals and groups on good nutritional habits.

Disease

morbidityillnessdiseases
Most RDs work in the treatment and prevention of disease (administering medical nutrition therapy, as part of medical teams), often in hospitals, health-maintenance organizations, private practices, or other health-care facilities.

Health maintenance organization

HMOhealth maintenance organizationsHMOs
Most RDs work in the treatment and prevention of disease (administering medical nutrition therapy, as part of medical teams), often in hospitals, health-maintenance organizations, private practices, or other health-care facilities.

Food industry

food productionfoodFood processing
A growing number of dietitians work in the food industry, journalism, sports nutrition, corporate wellness programs, and other non-traditional dietetics settings.

The American Heritage Dictionary of the English Language

American Heritage DictionaryAmerican HeritageAmerican Heritage Dictionary of the English Language
As explained by the American Heritage and Merriam-Webster's dictionaries, the cause of the confusion is that the spelling with "-tian" is an irregular alteration of the ending "-cian", which is otherwise exclusively used to refer to specialists and practitioners of other professions.

Merriam-Webster

Merriam WebsterMerriam–WebsterG. & C. Merriam Company
As explained by the American Heritage and Merriam-Webster's dictionaries, the cause of the confusion is that the spelling with "-tian" is an irregular alteration of the ending "-cian", which is otherwise exclusively used to refer to specialists and practitioners of other professions.

International Labour Organization

ILOInternational Labour OfficeInternational Labor Organization
This information can be found in the documentation held by ICDA and by the International Labour Office (ILO).

Foodservice

food serviceFood and Beveragetable service
Dietitians supervise the preparation and service of food, develop modified diets, participate in research, and educate individuals and groups on good nutritional habits.

Research

researcherresearchersoriginal research
Dietitians supervise the preparation and service of food, develop modified diets, participate in research, and educate individuals and groups on good nutritional habits.