There is one thing T.J. Dillashaw regrets doing in his career.
On an episode of Food Truck Diaries with Brendan Schaub, the former UFC bantamweight champion reflected on his decision to cut from 135 to 125 for a champ vs. champ fight against then-UFC flyweight champion, Henry Cejudo in 2019. It was costly, as Dillashaw suffered some severe consequences during and after his fight with Cejudo at UFC Brooklyn. Not only did he lose by first-round TKO, but he also lost a few years of his career.
Dillashaw tested positive for erythropoietin (EPO), a banned substance he used to help with his cut.