I am primarily interested in valid/reliable instruments that were used outside the U.S. Especially instruments which measured nutrition educational processes through cultural erudition models such as Africentrism, etc.
I am not exactly certain, however, have you researched the World Health Organization, a division of the United Nations? This may provide a start for you.
I found several links that you might want to investigate.Each link is in reference to tools to measure global health issues.I hope you find them useful.
That is too specific in my opinion with regards to measurements. I would look for a tool to measure culturally sensitive education, one to measure nutrition education for it's appropriateness to audience, and potentially combine the best of each to form your own tool. Nutrition is tough to umbrella. The WHO and several of the African based NGO's will have culturally and geographically specific tools for education and nutrition. Your work may be in trying to measure too much with one tool that will translate across to any other group.