Human flesh is not adapted to industrialized and modern life.
Human brains prompt them to constantly seek sugars, proteins, and fats, but the efficiency of modern society in acquiring food is countless times higher than that of our ancestors 40,000 years ago, while their digestive and metabolic systems are unable to process the excess nutrients.
Human brains reject the concept of "paychecks settled by periodic cycles"; they can accept "hunting/gathering for days on end, but each action should yield results." Some people spend a long time snagging a small advantage precisely because the positive feedback from the "small advantage" is too immediate.
Evolutionary Psychology scholars believe that "psyche", "spirit" act upon our hunter-gatherer ancestors' evolutionary process to produce adaptive mechanisms that are the programs and applications manipulating the machinery of the body.
Now, these adaptive applications themselves are in conflict with the civilization created by humans.