I took a Coursera class that just finished sponsored by Vanderbilt regarding nutrition. I found it very interesting (and you couldn't beat the price - free). I found it especially interesting to find out about food labeling laws in this (and other) countries. The professor also interviewed the author of a book about diet/nutrition around the world -- I must have seen most of the same pictures of families from around the world surrounded by the week's worth of food. It was a stark contrast to see the American families surrounded by a kitchen full of food and then a refugee family from Africa with a few vegetables and a small bag of grain.