In a new trailer for Sunday's episode of Keeping Up with the Kardashians, Khloe Kardashian Odom and Kim Kardashian are shown hatching a plan to help their brother lose weight.

They come up with an idea to change Rob Kardashian's eating habits. After Kim shared that she learned how to prevent stretch marks, she said she realizes Rob has them also from his weight gain.

Khloe asks what they should do to help him lose weight. She then shares a tale about a friend that convinced her mother to quit smoking by making her smoke too much cigarettes within a short period of time.

"Once she got sick to her stomach, she stopped smoking," Khloe said. "Maybe let Rob binge out a little."

Kim agreed and suggested that they "put him a room and give him burgers and fries and pizza." Khloe adds, "Yeah, let's get him so sick that he's like 'I could never eat fast food again.' "

In a second preview clip, Brody Jenner talked about his issues with his father, Bruce Jenner.

In his on-camera confessional, Brody addressed the relationship his father has with his other children, saying, "Bruce with Kendall and Kylie and Brandon, I'm actually so happy for them."

"I think that Bruce is an incredible human being and that Bruce us a great father, I just think that he wasn't a great father to me," he added. "The little bit I see of him with the girls, he was never like that with me. Never."

In another scene, Brody tells Bruce, "you weren't around for me as a kid," but Bruce quickly cuts him off and tells him, "Now is not the time to talk about it."

Keeping Up With The Kardashians airs at 9/8 p.m. Central on E!

Watch the preview trailers for the second episode of season 8.

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