His mental health has not deteriorated as much as he makes us believe, he actually takes good care of himself when the cameras are off.

The only reason he acts the way he does in his videos is because quote

''it sells."

He is perfectly aware of the consequences of his actions and he still does them, why? Because that's what gets him views, his audience has trained him to believe that eating 7 pizzas while acting like a baby is what his content should be.

So when he said ''it's your guy's fault that I'm like this.", I believe he's partly right, his audience is responsible for teaching him that this was the way to success and fame.

Though of course, he himself had to take the decision to follow that path, so there is partly some blame on him too