Kim Kardashian's brother Rob has stayed out of the limelight and off the clan's reality show for about a year.
When Rob appeared on "Keeping Up With the Kardashians" in 2013, he complained about his depression and weight gain (video below).
Apparently his weight is still an issue, as Rob lashed out against the "haters" last week on Instagram.
Rob posted an old picture of himself with a muscular physique and added the caption, “Last throwback of the day and yes I’m fat now so yall haters can literally suck d---,” noted Radar Online.
Rob posted another picture of his former muscles and added the caption, "Last throwback of the night before I go play some fat boy ball !! MOTIVATION."
A Kardashian family source told HollywoodLife.com:
“Rob, has been depressed for over a year now and it’s affecting him physically, mentally and emotionally. He’s been trying to drop about 50 pounds for a while now, unfortunately he just can’t keep it off. His weight affects his mood and then his mood affects his motivation to eat well and work out. It’s a vicious cycle. Rob knows he’s overweight and the last thing he wants to hear is other people giving him a hard time about it. That’s why he lashed out!”
There have also been reports that Rob's other famous sister Khloe is trying to get him to enter a rehab program in Utah, but that has not been confirmed by the family.