Are you trying to publish your findings or do you want information? The journal of obesity has some research about health beliefs, obesity and food labels at: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3681300/
Cynthia, in that case you need to do an extensive literature search regardless of the journal. I suggest that you work with the reference librarian(s) and have them show you how to search Medline, and the other major collection engines.