Cant speak for all old fat guys by any means but have noted bad indigestion producers for me are canola oil..cotton seed oil..and oleo margarine. I can eat lard..butter..peanut oil..olive oyl and bacon grease without issues. I am convinced canola is also deadly. You need to watch Dr. Becker on TV. He is very smart about that kind of stuff. Now as you say doubt a person not notice it in a bi annual pan of cookies. Where it will give a person vapor lock is mostly on fried food..gravies..rouxs etc. Them crazy cajones sometimes make roux with oleo. You start burping them greasy old firey burps about midnight..you will wish you had chosen the Chinese food instead.