My wife and I have gone to a number of courses on diet and health that The Villages Health gives. I don't think you need to be member to attend. A lot of what is in the course is stuff we already know but we've always picked up a few things we were not aware of. The courses are presented very will and the instructors have been very knowledgable. They have a "Pre-Diabetes" course. The schedule is at:
Learning Center Classes and Education Programs - The Villages Health