Stress falls into two categories -eustress and distress
-eustress and re stress
- fight or flight
-peed pressure and tension

You can literally find this on google of each science career and search up what type of training you need and how many years in school

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.