First of all, eating McDonald's French fries will make you angry, which is something that has always troubled me personally.

As for the potato skin, there is not necessarily any harm in eating it.

And toxicology has a very important indicator "dose". Even if it is poisonous, there will be no problem if the dose is small. Vice versa, the dose of water, rice, and salt taken in is large enough. , can also be poisoned.