Rob Kardashian's doctor warned he risked death if he didn't change his lifestyle.The 'Keeping Up with the Kardashians' star - who has been battling with fluctuating weight - sought medical help on the urging of his mother and manager, Kris Jenner, and the family were horrified by the results of his medical testing. In scenes which aired on 'Keeping Up with the Kardashians' in the US last night (09.03.14), the doctor advised Rob was at risk of developing diabetes and eventual organ failure, prompting Kris to give her 26-year-old son a stark warning. She told him ''Your liver is shutting down. ''This is life-threatening at this point. You can only sustain this level of being unhealthy for so long.'' Rob - whose father Robert Kardashian died aged just 59 from oesophageal cancer in 2003 - agreed he needed to make changes and was later praised by his personal trainer for his hard work in the gym. The shocking news came weeks after the sock designer admitted to his older sister Khloe Kardashian that his weight gain has made him depressed. He recently said: ''I've never felt so down depressed in my life. I'm trying to be in the fashion industry and I'm not going to be taken seriously when I'm fifty pounds overweight. It's embarrassing to the family.''