There's some posts about food in the Health and Diet forum.
I'm feeding Diamond Naturals right now.. just switched to it, but I'm still looking at other options. There's so many different foods available.
I do know that any foods with corn or corn meal are not really good for any dog. I have also heard that too much protien is dangerous for Yorkies. I just made a new post in health and diet forum asking some questions about this.