In addition, I'd also point out that the term "nutritionist" doesn't even mean anything is most jurisdictions, as highlighted by the following anecdote:

"A demonstration of the ease in which it is possible to become an accredited nutritionist can be seen in Dr Ben Goldacre's successful application to have his dead cat Hettie accredited as a certified professional member of the American Association of Nutritional Consultants" [1]

I'd typically listen to what a Dietitian has to say about nutrition, but not anyone calling themselves a nutritionist.

[1] https://en.wikipedia.org/wiki/Nutritionist#Regulation_of_the...