Zzzap’s human state after bleeding energy

“Is Barry okay?”
“He is in intensive care,” said the cloaked woman, “two floors above your room. He weighed ninety-seven pounds when he reverted to human form. He has lost significant muscle mass, all of his hair, and his finger- and toenails. He displayed several symptoms of imminent myocardial infarction, but Doctor Connolly has managed to control these.”
…
“He may not be able to transform into Zzzap for some time without putting himself at risk,” Stealth said. “Once his condition stabilizes, he will need to regain much of the mass he has lost.”

Excerpt From Ex-Isle, pg 674-675
Peter Clines
https://books.apple.com/us/book/ex-isle/id989619017