Dear Dietitian: My Plate

Dear Dietitian,

I'm familiar with the food pyramid and five food groups used to help guide food choices over the years. I see some older references to seven food groups. What was this about, and why have we changed things over the years?

Thanks,

Joe

Dear Joe,

The U.S. Department of Agriculture (USDA) has published nutrition guidelines since 1894. It has changed over the years, and the more things...