"We gotta get Rob back out here doing his thing," Khloe told E! News

By Karen Mizoguchi
Updated January 08, 2016 10:20 PM

Khloé Kardashian is her brother Rob Kardashian’s number one supporter.

The supportive sister gave an update on her reclusive sibling, who was rushed to the hospital for stomach problems days after Christmas, with some reports citing his diagnosis as diabetes.

“I think that health scare hopefully rattled Rob a little bit and maybe woke him up,” Kardashian, 31, shared with E! News on Friday.

“It’s only eight days of this year but I think I’ve seen such a great transformation just mentally right now. So I hope that sticks,” she said adding, “Again it’s only been a week, but I hope that sticks and I’m always praying and rooting for Rob. I’m very hopeful.”

RELATED VIDEO: New Details on Rob’s Struggle in the Spotlight

For the past two years, Rob, 28, has chosen to stay out of the public eye as he struggles with depression and 100 lbs. weight gain.

“Even after his medical scare, Rob acts like he wants nothing to do with the world,” a source previously told PEOPLE. “He doesn’t respond to texts from people that are genuinely concerned and checking up on him.”

In an interview in October for her PEOPLE cover story, Khloé opened up about her relationship with Rob, who has been living with her.

“He’s such a great guy. That’s also what’s so infuriating,” Khloé said. “He’s charming, charismatic, everything. But I’m like, where is your will to live? Where is your will to live life? Let’s be around people!”