Well...there are still tons of people who eat high-fat fast food. None of those companies you mentioned are going out of business anytime soon...
...however, the trend toward healthier eating has forced fast-food companies to accommodate these customers. McDonalds has rolled out premium salads...
Nitroglycerin is usually given in a situation like that--if someone is there or the patient can get to it themselves in time.
If the patient is dead when the EMTs/medics arrive...then she is dead. There is nothing that can revive her. If someone had been there to give her oxygen, mouth to...