The 29-year-old reality star has turned his life around after finding romance with Chyna, a former exotic dancer and model who has a child with rapper Tyga, Rob's sister Kylie Jenner's boyfriend.
As well as becoming a recluse, Rob suffered from a variety of health issues - the most debilitating of which was when he was told he had diabetes.
Rob was prescribed the drug insulin to manage the illness, but stopped taking it for six months, leading to his hospitalisation last December.
It was when he got out of the hospital that Rob realised his life needed to change, and Chyna, was more than happy to step in and help her beau.
"It was a big-time scare. I had found out I had Type 2 diabetes six months before but I stopped taking my insulin," he told People magazine. "I didn't enjoy the routine. So I ended up nonstop throwing up, and I couldn't even swallow because my mouth was dry. I felt like I was going to die. When I got out of the hospital, I knew I knew I needed to make changes.
"Chyna and I had a really big talk and and she told me that by having her cook for me, my diabetes would be gone. And it is."
Chyna put Rob on a strict exercise and diet regime, leading to the Keeping Up With The Kardashians star losing 30lbs quickly. However, he then regained 20lbs and now weighs in at 285lbs but admits the fact that Chyna is now pregnant with their first child and eating whatever she wants is making it difficult for him to stick to his diet.
"I am in that uncomfortable state again. I've got to get back into the routine. But it's hard because she's pregnant and eats whatever she wants, and I enjoy eating with her." But he has no plans to stay uncomfortable.
While Type 1 Diabetes is widely considered to have a genetic factor behind it, Type 2 Diabetes is often associated with being overweight. Losing weight can be an effective way of managing Type 2 Diabetes and can, in some situations, reverse the diagnosis.
Now Rob claims he no longer has the condition, he is likely to have stopped the tablets and injections he may have been having to manage his diabetes.
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