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06/10/2013 05:08 am ET | Updated Jun 10, 2013

'Keeping Up With The Kardashians': Kim Forces Rob To Binge On Junk Food (VIDEO)

While he's been making tabloid headlines for a while, Rob Kardashian's sudden weight gain became a major topic of concern for his sisters on "Keeping Up With the Kardashians" this week. He'd put on close to 50 pounds, and felt he was "embarrassing to the family."

This was after Rob, who was now weighing in at 241 pounds with a 45-inch waist, missed the private training sessions Kim had set up for him. Hollywood Life couldn't believe he was as much as 50 percent body fat, when he should be, at most, 25 percent. Kim's idea was to get him so sick on junk food that he'd never want to eat it again.

"I really needed a pregnant friend," Kim joked. When Rob insisted he wasn't pregnant, Kim responded, "I know, but you eat like one.”

Unfortunately, the plan backfired, though Rob did say he wanted to get fit and planned to work out with Khloe's husband Lamar. And, however he did it, Rob proved a man of his word. He was looking much slimmer last month while promoting his sock line and told People he has a goal of getting down to 200 pounds by the Fourth of July.

Follow Rob's weight loss journey on "Keeping Up With the Kardashians," Sundays at 9 p.m. ET on E!

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