Rob Kardashian's recent health scare and diabetes diagnosis has likely been very tough on his family, especially his sister Khloe Kardashian , who has always been very close with him. The 31-year-old Keeping Up With the Kardashians star posted on her Instagram page on Tuesday a photo of herself looking, as she put it, "melancholy." The 28 year old, who has been reclusive for more than a year, was hospitalized over the holiday weekend and diagnosed with diabetes, or elevated blood sugar, which can be life-threatening if not treated. A source told E! News on Tuesday he had returned home and is "fine," adding that his health scare was a "wake up call" and that doctors told him that he needs to lose weight, exercise and change his diet dramatically.