All the more so as a lot of people are speaking their second (or third or fourth!) language here. It's hard enough to be brilliant in one's native tongue; it's certainly not expected in a foreign language!
Well, even though Petra is The Boss, and you're the originator of the thread, I hope you'll both play!
And now, back to riddles. My poor sleepy brain came up with this:
I'll help you out in times of woe
But with the pain, the fun will go.
Some leaves of this, some fruit of that
A tongue or brain to add some fat.
You'll use me when you begin to rue
What your fine cup has made you do.
We've had one guess that was on the right track but not correct. Don't just seize on one word; read the whole thing and think about it.