Staples? Yeah, we've got that. We go waaay back to talk about the histories of these three crops, discuss why that long history robs them of good medical stories, and figure out which you should lean towards come meal time. 

• Medicinal use of potato-derived products: a systematic review - PubMed
• The Natural History of Wheat - Encyclopedia.com
• The Natural History of Rice - Encyclopedia.com
• How the Potato Changed the World - Smithsonian Magazine