Just bringing the thread back up for people that may not have seen it.
This video link is a bit complex in part but once it get past the PPARs it gives a fascinating insight into the growing appreciation that body functions all interlink and the potential impact of food in diet - gene expression - nutrigenomics - the effect of food on genes.
You can also see that those in commercial research are beginning to recognise a potential blurring of lines between drugs and food agents and the complications that causes for them.
http://videocast.nih.gov/launch.asp?13776