Shelby Houlihan says she ate a port burrito before her drug test and this is why she tested positive.

Olympic runner Shelby Houlihan said she has been banned from the sport for four years following a positive test for anabolic steroids that she attributes to eating a pork burrito.

Houlihan said she was devastated to learn of the suspension from the Athletics Integrity Unit (AIU), an independent body that combats doping, after she tested positive for nandrolone.

Houlihan said in a post on Instagram Monday that a burrito she ate before the test contained pig organ meat, or offal, which she said can lead to a positive test for nandrolone. A study funded by the World Anti-Doping Agency (WADA) found trace amounts of nandrolone can be found in that kind of meat and warned about the possibility of a false positive.

The ban will prevent the 28-year-old from competing in upcoming US Olympic Trials and the Tokyo Olympic Games. Doping accusations and investigations have led to multiple bans of athletes and even entire countries from competing, including a two-year ban on Russia from the Court of Arbitration for Sport (CAS).

The runner said she received an email from AIU on January 14, 2021, informing her that a drug test she took December 15, 2020, returned positive for nandrolone.

"When I got that email, I had to read it over about ten times and google what it was that I had just tested positive for," she said in the post. "I had never even heard of nandrolone."

posted Tuesday June 15th