You can't eat gold.

You also can't eat money, but I imagine it's pretty useful if you're hungry

If all the sudden someone airdrops a hundred tons of $100 bills into your area, you are going to have a hard time buying food with just the $20 in your wallet.

That is what is being discussed.

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Fine: you can't physiologically sustain yourself on a diet of gold alone. Gold is not a nutritionally complete diet. If all you have to eat is gold, you will soon be dead.

Midas didn't eat gold, and that's all he could have had.

https://en.wikipedia.org/wiki/Midas#Golden_Touch