system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Could “The Doubling Charm” be used on a hamburger? If so, would that hamburger have the same nutritional value as the original (if eaten quickly enough)

From what I understand, The Doubling Charm creates a perfect replica of whatever it’s cast on; however, over time, the copy breaks itself down and it’ll lose value...  while it does say it can’t copy metaphysical or fundamental entities, it doesn’t exclude organic matter in its description.
gpt
The relevant passage from Deathly Hallows:


    Hermione: "Your mother can’t produce food out of thin air, no one can. Food is the first  
    of the five Principal Exceptions to Gamp’s Law of Elemental Transfigura—"

    Ron: "Oh, speak English, can’t you?"

    Hermione: "It’s impossible to make good food out of nothing! You can Summon it if you know where
    it is, you can transform it, you can increase the quantity if you’ve already got some..."

So, while it's not clear if the Doubling Charm specifically works, there should be spells that can duplicate food.