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John Cena<\/strong> left fans shocked when he recently revealed his past Mountain Dew diet. The actor and wrestling icon shared this unexpected detail during a recent appearance on The Tonight Show.<\/p>\n John Cena appeared on The Tonight Show Starring Jimmy Fallon<\/a> on August 13, where he made a shocking confession about his diet. During his segment, the Peacemaker star went head-to-head against Fallon in a fun game of Wild Guess.<\/p>\n The pair took turns sharing a bizarre fact about themselves, and the other had to guess whether it was true. It was during one of his turns when Cena stated that he once drank Diet Mountain Dew for weeks.<\/p>\n \u201cI used to go whole weeks where all I drank was Diet Mountain Dew,\u201d Cena revealed, leaving Fallon visibly confused. Although he was initially skeptical, wondering how it was possible given Cena\u2019s impeccable physique, Fallon ended up guessing it was true. After a tense drumroll, Cena confirmed that Fallon was indeed correct.<\/p>\n This isn\u2019t the first time that we have learned about this questionable habit in Cena\u2019s past. During a 2024 interview with Denise Salcedo<\/a>, WWE Hall of Famer Mark Henry recalled giving Cena a ride to his hotel, where he witnessed his odd routine.<\/p>\n \u201cAnd I found out that during his diet\u2026he was not drinking water for a week. The only thing he drank was Diet Mountain Dew. I was shocked,\u201d Henry recalled.<\/p>\n It soon became a running gag between the two WWE stars. \u201cAnd I remind him of it all the time. Every time I\u2019ll see him and I\u2019ll go, \u2018Had your Diet Mountain Dew?\u2019 He\u2019ll go, \u2018I was young and stupid,\u2019\u201d Henry joked.<\/p>\n John Cena recently returned as the titular DC hero in the highly anticipated sophomore season of James Gunn\u2019s Peacemaker. The debut episode, \u201cThe Ties That Grind,\u201d premiered on Thursday, August 21, 2025.<\/p>\nJohn Cena says he drank diet Mountain Dew for weeks<\/h2>\n