a person who is an expert in nutrition or dietetics.
Also, dietician.

1840–50; diet1 + -itian; see -ician Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dietician or dietitian (ˌdaɪɪˈtɪʃən)
a person who specializes in dietetics
dietitian or dietitian

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History


1845, from diet (1) on model of physician.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dietitian di·e·ti·tian or di·e·ti·cian (dī'ĭ-tĭsh'ən)
A person specializing in dietetics.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
After getting all of the information, she picked up the telephone and called
  the dietician.
At her income level she can certainly afford a trainer and dietician.
Patients should meet with a dietician or diabetes nutrition expert for help in
  learning this approach.
Consult a registered dietician to help adjust your food plan during pregnancy.
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