system
Given the following post, respond as if you're commenting on Reddit:
human
[Futurama] Why did Fry lose all the benefits when the worms left him?

The worms themselves claim that he did no more damage to himself than a bad night of drinking. But this was after getting more than twice as smart.

And he never damaged his muscles either, only his brain.
gpt
Their positive effects were not yet permanent.

The brain tune-up was still incomplete and most of the results needed to be maintained for a while longer to take hold.

The muscles are similarly affected, and in addition, he was getting an equivalent of good workout from the worms. Once they were gone his muscles would quickly lose their strength.