Channing Tatum's dramatic weight loss for his role in the upcoming film "Roofman" left people "concerned."Tatum dropped nearly 70 pounds for "Roofman" after gaining weight for his previous role in "Josephine." The actor's latest film focuses on the story of Jeffrey Manchester, a real-life criminal who escaped prison and hid inside a Toys R Us store for months."Jeff is a really thin guy," Tatum explained during an interview with Variety. "Hes not as big-bonded as me. I think hes tall, but hes just really wiry."I had just done a role earlier that year, and I got up to 240 [pounds]," he added, referring to his role as Damien in "Josephine." "I only planned to get down to 185. Once I was already going [with] the days of shooting, it kept coming off. I got down to 172."CHANNING TATUM REFUSES TO BOOK FAT ROLES IN HOLLYWOOD AS ACTOR SHEDS 30 POUNDSTatum's intense weight loss led assistant director Mariela Comitini to become "concerned," according to "Roofman" director Derek Cianfrance."Shes like, Thats it. Shes like, Get him a steak right now," Tatum recalled. "I was like, I think youre right. This is weird."Tatum said his transformation had "sort of an emptiness and a sadness to it.""I would see myself and just seem hollow," he added. "The movie to me was a lot of loneliness. A real meditation for that wanting to be full. That empty feeling sucks after a while."LIKE WHAT YOURE READING? CLICK HERE FOR MORE ENTERTAINMENT NEWSTatum previously showed off his body transformation on Instagram weeks after wrapping filming."We back up! lol. 1st photo is today 205. 2nd photo 235 for a movie called Josephine Then went to 3rd photo which is 172 for a movie Roofman," he captioned the set of photos. "Im so grateful for my genetics. Grateful for my chef/nutritionist/witch. Grateful for my trainer."I couldnt make these big swings in my weight without you guys," Tatum added. "But i wont be doing anymore fat roles haha. Its to [sic] hard on the body and too hard to take off now. But d--- when i look at these pics its just wild what the human body and will can do."CLICK HERE TO SIGN UP FOR THE ENTERTAINMENT NEWSLETTERTatum rose to fame by starring in films such as "Coach Carter" and in the 2006 comedy "Shes the Man" starring Amanda Bynes.While the Hollywood actor took on physically demanding roles throughout his career, Tatum put his physique to the test when he starred in the 2006 dance movie "Step Up."Fox News Digital's Stephanie Giang-Paunon contributed to this report.