<i>KUWTK</i> preview: Kim tells Rob he's 'not bipolar'

So it turns out Kim Kardashian's diagnosis of brother Rob having bipolar disorder isn't reliable. What?!

In this clip from the upcoming episode of Keeping Up With The Kardashians, Kim reveals to Rob why she thinks he isn't bipolar after all. Uh, thanks Dr Kim. Watch above.

Kim and sister Khloe take Rob on a hike in LA to help him reach his weight-loss goals. Naturally, Kim uses the opportunity to show off her squatting skills and dispense a psychic's advice to her siblings.

It all comes off a tad condescending... especially since Kim has previously put down Rob for being the "loser" of the TV family. Well, if he keeps up the hikes with Kim, he might end up The Biggest Loser!

This all happened in the months leading up to Rob snubbing Kim's wedding, reportedly because he felt self-conscious about posing in family photos at his current weight. Rob, 27, flew back to LA from Europe the night before Kim's big day back in May.

Check out this flashback video from 2011 in which Kim first claimed Rob was bipolar... and Rob called her a "whore" in return. What nice people...

Keeping Up With The Kardashians airs 9.30pm on Mondays on Foxtel's E! channel.

In pics: The fakest family in showbiz! Kardashian TV secrets exposed

Author: Adam Bub. Follow on Twitter. Approved by Amy Nelmes.