A clampdown on contamination in growing fields has pushed out wildlife and destroyed habitats. Adam Cole/NPR hide caption

itoggle caption Adam Cole/NPR

Once the roots of the Eskimo potato got too tough to eat, Christopher McCandless started collecting the seeds in a plastic bag, says author Jon Krakauer. Photo courtesy of McCandless family hide caption

itoggle caption Photo courtesy of McCandless family

After initially recalling products made at its Oklahoma facility, Blue Bell is now asking retailers and customers to throw away or return all of its products currently on the market. Blue Bell hide caption

itoggle caption Blue Bell

Food companies can make safety evaluations of their products in secret without ever telling the Food and Drug Administration. Luciano Lozano/Ikon Images/Corbis hide caption

itoggle caption Luciano Lozano/Ikon Images/Corbis

An FDA field inspector in Los Angeles checks imported shrimp, February 2009. More than a dozen federal agencies play a part in keeping food from making Americans sick. Critics say that leads to a lack of coordination, a patchwork of rules and holes in the system. FDA hide caption

itoggle caption FDA

Eastman Chemical went a step beyond calling Tritan plastic BPA-free, setting off a legal challenge. Eastman hide caption

itoggle caption Eastman

Dr. Margaret Hamburg will have served almost six years as FDA commissioner by the time she leaves, far longer than the recent tenure for chiefs of the agency. J. David Ake/AP hide caption

itoggle caption J. David Ake/AP
Samuel LaHoz/Intelligence Squared U.S.

To refrigerate or not to refrigerate? It boils down to bacteria, aesthetics and how much energy you're willing to use. Robert S. Donovan; Flickr / Alex Barth; Flickr hide caption

itoggle caption Robert S. Donovan; Flickr / Alex Barth; Flickr

Bob O'Connor, a Foster Farms veterinarian, holds an 11-day-old chick at a ranch near the town of Merced, in California's Central Valley. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

Edibles available at LoDo Wellness Center, a retail marijuana and medical marijuana dispensary and grow facility in downtown Denver. Matthew Staver/Landov hide caption

itoggle caption Matthew Staver/Landov

A U.S. company that supplies meat to some fast-food chains in China has pulled all of its products, some of which were chicken nuggets sold in Hong Kong, made by a Chinese subsidiary. Kin Cheung/AP hide caption

itoggle caption Kin Cheung/AP

Foster Farms set up new procedures to deal with salmonella contamination after the USDA threatened to shut down its plants last fall. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Truffles are among the many foods infused with THC – the chemical in marijuana that gives you a high — already for sale in Colorado. Luke Runyon/KUNC/Harvest Public Media hide caption

itoggle caption Luke Runyon/KUNC/Harvest Public Media