Carl Custer, a retired microbiologist who spent 35 years in the USDA's Food Safety Inspection Service, toured a BPI factory in 2002 while investigating salmonella in ground beef. "We originally called it soylent pink," Custer told The Daily. "We looked at the product and we objected to it because it used connective tissues instead of muscle. It was simply not nutritionally equivalent [to ground beef]. My main objection was that it was not meat."
Custer's former colleague Gerald Zirnstein coined the term "pink slime," which was then popularized by celebrity chef Jamie Oliver (2:05 in the linked video).
According to Custer, the USDA ruled that "pink slime" was safe, despite concerns, because a George H.W. Bush appointee who had been president of both the Florida Cattlemen’s Association and the of the National Cattlemen’s Beef Association -- undersecretary JoAnn Smith -- pushed it through. Smith now serves on the board of directors of Tyson Foods, the largest chicken, beef and pork processing company in the world.
"It’s more like Jell-O than hamburger, plus it’s treated with ammonia, an additive that is not declared anywhere," Custer said.