“In other terms, the more the fly becomes intelligent, the shorter its lifespan,” the scientists said.
This is most probably because the increase in neural activity weakens the fly’s life-support systems, they speculated.
—
hmmm

A sarcophaga carnaria fly. Scientists at the University of Lausanne
have found that ignorant flies live longer than their smarter counterparts.
(AFP/File/Christian Puygrenier)
That is because the smarter flies begin to wonder why they are eating s***.