Jack would be more tolerable if he was indeed drunk while making these videos - it would at least explain the incoherent rambling, short and irrational temper, poor planning and execution of his videos, and his overall poor health. He has all of the check marks of a chronic alcoholic.
I don't watch a lot of Jack anymore - mostly enough to load his video, down vote, and go to something else. But briefly reflecting on the last couple of years of Jack's aimless content and complete lack of personal development, I also have been in a rut myself - basically rested on my laurels when others around me in my personal kept climbing . Jack has to be frustrated that his life has basically become static - wouldn't it be cool if even in the face of his health issues, he could find some new area for self development?
Sadly, I think what remains is just more Wendy's bacon burgers getting shoved down his throat. But it's never too late to do something for yourself to be better.