Rob Kardashian, Instagram

Instagram

Now that Rob Kardashian is on a mission to lose weight, he is opening up to his followers about what caused the start of his weight gain.

In an Instagram post shared late Thursday, Rob posted a throwback picture of himself drinking a milkshake. "Started right here with these milkshakes hahaha... #throwbackthursday," he captioned the pic. He also included two purple devil emojis and two tongues.

The photo seems to be from 2011, when Rob had dinner at Sugar Factory American Brasserie in Las Vegas. Mom Kris Jenner revealed in an episode of Keeping Up With the Kardashians that Rob gained more than 100 lbs in a year, but it looks like the estranged reality star is turning his life around.

"For the first time in a long time Rob is committed to changing his diet habits," a source told E! News. "He's been working with a chef and doing really well."

Rob Kardashian

Dimitrios Kambouris/Getty Images for E!

Rob has also been hitting up the gym with personal trainer Gunnar Peterson, who also whips the rest of the Kardashian family into shape. "His regimen involves more than just cardio and weights," the source added.

The 28-year-old has been going out of his way to stay out of the spotlight, but recently he has been going out more, taking hikes with sister Kim Kardashian and even running into Tyga and Kylie Jenner while they were walking on a hike of their own. Not only is Rob becoming more active the physical sense, he's also becoming more active on social media.

Although he was once completely off the Internet grid, Rob has been Instagramming a lot as of late, sharing pics of North West, memes and more.

Even sister Khloe Kardashian, who always seems to be in the gym these days, dished to E! News about how well Rob is doing. "Right now I'm really proud of him. He's been working out a little and trying to get his groove back," she explained. "And he acknowledges it! He's aware that he's very introverted and of course not the way he used to be. I think being aware is probably the best thing."

With this new Instagram post about milkshakes, it looks like Rob is definitely "aware" of what acted as a catalyst for his downward spiral.

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