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Why Olympians bite their medals

The United States’ Simone Biles bites her gold medal after winning the women’s individual all-around final on Thursday. (Dmitri Lovetsky/AP)

It’s not a chocolate coin wrapped in gold foil, people. That’s actual metal that composes that Olympic medal, so why do athletes bite them?

There’s actually a few reasons, but the most obvious is that it’s a pose photographers really, really like to capture.

“It’s become an obsession with the photographers,” David Wallechinsky, the president of the International Society of Olympic Historians and co-author of “The Complete Book of the Olympics” told CNN in 2012. “I think they look at it as an iconic shot, as something that you can probably sell. I don’t think it’s something the athletes would probably do on their own.”

Biting down on a hunk of metal is more likely something someone might have done during the Gold Rush to test whether the shiny golden rock they just panned for was actually pyrite or fool’s gold. Human teeth are harder than gold but softer than pyrite, according to the Mohs Hardness Scale, which categorizes how easily minerals scratch. This means a quick gnaw to real gold would actually leave an indentation. A hard chew of pyrite, meanwhile, might damage your teeth.

The practice also once served to see whether coins were solid gold or just gold-plated over a cheaper metal, Today I Found Out explains.

With that in mind, it’s likely that Old West/pirate lore led to someone once biting their Olympic medal in a spontaneous, “Is this real life?” moment, and the photographers thought it was cute. Because if someone really was hoping to discover whether that gold medal is pure gold, their smiles would quickly fade.

Olympic gold medals are actually just 1.34 percent gold. The rest is sterling silver, ABC News reports. And much of it is recycled silver this time around, which makes the 2016 Rio medals “the most sustainable ever made,” according to Forbes magazine contributor Anthony DeMarco (via ABC News). DeMarco says the materials that make up a “gold” medal are worth $564.

How much are Michael Phelps’s gold medals really worth?

Winning athletes would be better served to make sure the checks they receive for coming out on top don’t bounce. Along with their gold medals, Olympic winners get $25,000 prizes.