Why is the sudden death rate among young people so high nowadays?

I'm not sure if society has intentionally or unintentionally done this, but the dangers of prolonged high stress combined with prolonged sedentary behavior have been severely underestimated.
These two factors wreak havoc on the human body comprehensively and without blind spots. Especially for young people—get caught in one, and your body is definitely done for; catch both, and premature death is a highly probable outcome.
Young people's bodies can be sustained by almost anything for 20-30 years.
When young, thanks to powerful metabolic resilience, you can compensate for terrible eating habits, but eventually, the bill comes due.
At 18, you can eat pizza and drink beer every day, your body digests and absorbs it, you stay slim, and you feel great.
By 35, with the same diet: the result is weight gain, fatigue, inflammation, "metabolic syndrome."
What changed?
Your compensation mechanisms are exhausted: your body has been depleting stored energy reserves to repair health issues and overwork itself to process nutrients incompatible with your body, until eventually those reserves run out, repair mechanisms fail, and overworking becomes unsustainable.
Your eating habits didn't change—you simply ran out of the ability to compensate for bad eating.
This is why young people think they can eat anything—they're cashing in on "credit" they've unknowingly accumulated, and the interest comes due when you hit 30 or even 40.
Many people don't understand that the human body isn't "compartmentalized." Your emotions, physique, endocrine system, nervous system, sleep, digestive capacity, sexual function, and all other aspects are highly unified—there's no such thing as one area being good while others are bad independently.
For example, prolonged mental stress means cortisol stays at elevated levels, with direct consequences: chest tightness, shallow and rapid breathing.
Your digestive system enters a stress state, digestive capacity collapses, and you either get diarrhea or constipation.
Neck and shoulder stiffness, sympathetic nervous system overactivation, difficulty falling asleep, poor sleep depth, easily awakened.
Your body is exhausted yet unable to relax, sympathetic nervous system overactivation, erectile dysfunction, or premature ejaculation when it does happen.
Your body desperately craves high-sugar, high-salt, high-carb foods, your body becomes highly efficient at converting visceral fat, your belly protrudes and hardens, and after a while, fatty liver disease sets in.