I have two questions about the following sentence:
"A child star's shelf life is now shorter than ever, with many only making headlines for their substance-fuelled antics on the descent from acclaim to celebrity and obscurity."
- The meaning of the 'substance-fuelled antics' is not clear for me.
- In my understanding, the writer says that child actors, after a while, lose their position.
Why does he say "descent from acclaim to celebrity"? Isn't 'celebrity' a higher position comparing to 'acclaim'? Or I don't understand the meaning of this sentence well?