SoulgMcDonald’s isn’t gourmet but poison is a huge stretch
IDK, I remember seeing a post a few years back of someone who left a McDonalds cheeseburger and fries out to see how long it would take to spoil. IIRC the damn things went on close to a decade without a single bit of decomposition. While that may not be directly poison per se, that amount of preservatives and chemicals can’t be good for the human body.
It’s not 'chemicals", it’s grease. The frying process removes almost all the water in a McDonald’s burger.
That doesn’t explain the untarnished bun.
Bread doesn’t rot, it molds. Whether mold can grow depends on the conditions it’s kept in. The ingredients are availble to the public, the only preservative in the bun is calcium propionate which you’ll find in just about any other baked good on store shelves.
I bought a twin pack of Nutella from Costco. The unopened one developed mold after awhile, but the opened jar in the fridge was just fine. If anything, I was expecting at least the reverse.