ROB Kardashian has reportedly lost 3.5 stone since quitting his family’s E! reality show, Keeping Up With The Kardashians.

The 31-year-old, who was diagnosed with diabetes in 2015, has been focusing on turning his life around since his acrimonious split from his former fiancée Blac Chayna, 30, last July.

Since the break-up, Rob has successfully managed to remain out of the limelight and quit Instagram in a bid to mend his relationship with his ex for the sake of their daughter Dream, one.

A source told ET: “Getting out of the spotlight was so important for Rob.

“He needed to completely change his life, things were spiralling out of control for him and his health and relationships were suffering. He needed to refocus. His life is completely different now.

“He’s got his priorities in check. First and foremost he is there for Dream and he knows that to do so he needs to be healthy.”

In August, matriarch Kris Jenner opened up about Rob’s health woes and said he’ll return to Keeping Up With The Kardashians for series 16.

The 62-year-old momager assured fans that the sock designer is well and doing everything that he can to stay healthy after being diagnosed with diabetes in 2015.

Speaking to US Weekly, she said: “He’s working on his health and learning more and more about what it’s like to live with kind of the leftovers of the diabetes that he struggles with from time to time, and working on his, you know, just your nutrition and your health.”

Kris, who is executive producer on KUWTK, revealed her son will return to the family’s hit show – eventually.

She added: “I think we’ll probably see Rob more in [season] 16 than in 15.

“We actually start shooting season 16 in a month, if you can believe that.”