Is it acceptable for parents to tell TEEN kids "You're on your own for X meal. I'm exhausted / don't feel well & going to lie down."?

Yes. Of course! They'll forage or make something.
No. Parents should prepare meals even for teens.
It depends
I'm Gen X. Ik the drill. Cereal is just fine!
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Is it acceptable for parents to tell TEEN kids "You're on your own for X meal. I'm exhausted / don't feel well & going to lie down."?
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