Why does long-term stress affect your body differently than short-term stress?

short term stress is could be like babysitting an annoying kid for 1 hour, you will be annoyed by said kid and when your hour is up and your golden

Long term stress is like babysitting the same kid but for every day for 3 hours an day 24/7 that stress builds up and you kill the kid

there is no options  

df

i think she would gain 18 grams