Define lose. Well, nothing really happens. You just don't get the grand trophy for completely everything. If you do challenge AAA, but can't beat his score but beat Abigial's, you will get Abigial's prize but it dare will not be considered completed.
You lose 100NP. The only reason to do it, is to get an avatar, which is awarded randomly.
The worm that you have lost will reappear in Moltara.
No, not for that reason.
you lose conciousness. if the accident is severe you may lose a specific function
What happens if i lose my phone in the house and it is nowhere to be found?
exercise on a daily bases
you would lose a lot of weight if you huge and do it for a year or so daily
You Lose Your Voice
you will lose weight
flatulance
You die!!
With exercise, yes.