Suicide is not a disease of comfort. Obesity is not a disease of wealth, for food (and junk food) is incredibly inexpensive in the developed world today, likely no more expensive than heavy smoking, alcohol, cocaine or opiates.
These are diseases of overpopulation, loss of freedom and control over one's life and general lack of anything to live for in the future. Mouse utopia comes to mind.
It's true that obesity is an affliction related to poverty; but it is related to poverty in nations of relative wealth and comfort. Access to that cheap and terrible food relies upon a logistics system that is heavily resistent to famine and blight.
Those in poverty who are dying from obesity related diseases are not dying in work place accidents, and are not dying in war or from untreatible infections. They didn't die in a pandemic.
The opportunity to die of obesity related diseases is tied to the relative safety and comfort of the nations in which the late individuals were impoverished.
These are diseases of overpopulation, loss of freedom and control over one's life and general lack of anything to live for in the future. Mouse utopia comes to mind.