Eating refined carbohydrates like bagels may stimulate brain regions involved in reward and cravings, research suggests. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Researchers at Rice University conducted lab studies using light-dark cycles to try to coax more beneficial compounds out of fruits and vegetables. Heather Rousseau/NPR hide caption

itoggle caption Heather Rousseau/NPR

Delicious — in moderation, folks. Randy Bayne/Flicker Creative Commons hide caption

itoggle caption Randy Bayne/Flicker Creative Commons

At left: Beyond Eggs' egg-substitute product, a powder made of pulverized plant-based compounds. Right: Mother Nature's version. Cody Pickens/Beyond Eggs hide caption

itoggle caption Cody Pickens/Beyond Eggs

Stefan Larsson serves up bison sloppy Joes and juniper-smoked bison tenderloin, which will be offered at the Yellowstone National Park this summer. Each park will have different menus featuring local foods. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

An Illinois corn and soybean farmer walks to his tractor while cultivating his field. Seth Perlman/AP hide caption

itoggle caption Seth Perlman/AP

Share a Coke with ... (enter name here). Darren Foreman (left), Elliott Brown (middle), teigan (top right), ☼zlady (bottom left) via Flickr hide caption

itoggle caption Darren Foreman (left), Elliott Brown (middle), teigan (top right), ☼zlady (bottom left) via Flickr