Apparently this is the order of symptoms:
1. Social withdrawal
2. Apathy
3. Abulia
4. Psychic akinesia
5. Psychogenic death
Death is technically by dehydration, I'm assooming. I've reached into 4 a bit at times and have definitely experienced 1, 2 and 3. 1 and 2 I've had for years, 3 I've had on and off. I definitely believe this sort of death is something that can happen, but it takes a rare and specific kind of person and circumstance. Most people here are at least at 1 and 2, many at 3. Guess it fluctuates a bit, as well, at least at the lower levels.
I don't think this can be emulated in any other way than creating a life that has no off-chances at all and nothing that's uncertain. The trick is the word "life" here, since that can mean something very narrow. Read that old people can sometimes die like this after their life partner had passed away; makes sense, since that person was their entire "life". If they are dead then life is over. I could see this happening to me if I got a gf and she then passed away, not that I have to worry about that.