There's a lot of simple but highly effective things you can do to transition off of a corn-based diet, lessen your carb(on) food/footprint, support local farmers and choose humanely raised meats.
Studies show that people tend to eat the portion size they're given. So, rather than using a huge plate, opt for a small one. It will force you to eat less and get up more frequently for second helpings.
This year, if you really want to celebrate Thanksgiving, I want to challenge you to enjoy feasting on what is fresh and local.