Controlling Cameron is at it again!

Cameron Diaz has already nitpicked boyfriend Benji Madden to make changes on his living habits and even has gone as far as criticizing his appearance. But now his girlfriend forced him to go on a gluten-free diet, work out regularly and skip snacking in the studio, an insider told OKMagazine.com exclusively.

“She wants him to live a much healthier lifestyle,” the source told OK! “She’s got him a trainer and put him on a gluten-free diet.”

Benji, 35, reportedly “hates it” but is already “starting to look better,” the source added. “The bags under his eyes are going and he’s managed to lost 5lbs already.”

One of the demands Cameron, 41, has instated is a ban on all junk food for the former Good Charlotte rocker, including Benji’s “beloved burgers.”

“[Cameron] has banned him from indulging in his favorite junk foods…It’s a huge adjustment for him as he loves his burgers when he’s recording in the studio, but he loves Cameron more,” the source said.

This isn’t the first time Cameron has tried ruling Benji’s life. In August, the couple had their first fight over him being a total slob! A source told OK! Cam was “screaming about what a pig he is” after finding a pair of dirty socks tossed on the ground.

Good boyfriend Benji, however, “promised to help out more with the housekeeping” and the fight ended.

The couple had another spat, though, after Cam put Benj on a strict diet because his “late-night munchies in the recording studio have taken their toll on his waistline.” The blonde bombshell also complained about the singer’s tattoos and wanted him to have the ink removed.

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