So when you eat something and while it is in your hands just spam the "use" key (in my case F) you actually can make the food item disappear pretty pretty fast, you can eat a whole rice bag in one go. Yes you will get some "you are already using something else" or whatnot, but let's not care about that for now.
That's actually pretty cool, less time to eat so much.

It actually produces more than one eating sound (but not as many as it possibly should, eg not 10 for a bag of rice), but only one eating message ("you have eaten a fresh orange" and such).

But apparently it does not fill all the "internal storage containers" accurately - stomach, energy, water. In what ways it screws this up I cannot know but I strongly suspect at least the stomach does not get filled correctly.
I cannot know the exacts since I have no developers console or something.