Of course, everything should be done with constraint and too much of anything is bad for you. As for that individual: it seems he lived a sedentary lifestyle and had a poor diet. That or he was already genetically predisposed to diabetes.
In the modern world it's really important to not sit for hours on end playing video games. Our diets in the western world are horribly bad, and we really could do with all the exercise we can get. Furthermore, it is due to the increased popularity of video gaming, that the national health care in the UK is being burdened even further as younger and younger adults are presenting with conditions such as Diabetes, which used to be confined to middle-late age. Keep yourself fit and healthy, that always comes first.