Is there such thing as a traineeship or apprenticeship in nutrition?

I have completed my Children's Nutrition course, and would really like to continue with this, but I am trying to find out if I can work in this field while studying.
There are plenty more short courses I can do, but they are $700 each and I have just lost my job (in a different industry), so finances are going to be tight until I find another job.

I'm not sure where to look or who to ask??