Rob Kardashian hasn't stepped out in public for several months, so when he left his Los Angeles home yesterday, we were shocked to see that the 27-year-old reality star/sock designer doesn't seemed to have dropped any weight.

We're not sure what's wrong with him (maybe it's a thyroid problem?) but we really feel for the sole male Kardashian sibling. And we know he'd probably feel better if he got healthy. Maybe Khloe can coerce him into hitting the gym with her again? She seems to be the closest to him, and they were spotted going to a workout together over the summer.

Rob zipped around town in his matte black Mercedes G-Class SUV, and we're not sure what he's been up to lately, but he looked quite down in the dumps. Just last month mom Kris Jenner posted a throwback pic with Rob and wrote, "He's my everything. @robkardashian," and it appears as though she hasn't given up on her quest to get him to a happier place. "I want to fix Rob but sometimes you can't," Jenner said on Keeping Up With The Kardashians. "I have not not cried myself to sleep in so long that I don't even know what that's like."

Maybe if she wasn't so focused on promoting her daughters' careers (and dating men half her age) she'd have a little more time for Rob? Just a thought...