'This is ridiculous, I must be the last one, along with Genta.' Conan thought, and looked back to confirm his suspicions. Much to his surprise however, there was someone further back than them.
'Haibara? She's never been the most athletic of the class, but she's never been last on the mile run.' Conan wondered, but then realized something odd about Haibara; not only was she our of breath an struggling to keep up with Genta and Conan, but she looked different, she looked... fuller.
And indeed, her body had filled out, not a lot, but enough for it to be noticeable to Conan. Her cheeks had turned plump and rosy, giving her a chubby look all over, even if her weight gain wasn't all that much. Her arms were covered in a thin layer of fat, and jiggled slightly with each step she took, along with her legs, which were considerably thicker. She had developed a small paunch, just enough for it to stick out about an inch, if not less. She had gained weight, that was sure, maybe not as much as Conan, but since she wasn't very athletic to begin with, the put her at the bottom of the line.
Haibara seemed to notice Conan staring at her, and guessed what he was thinking. She blushed a little as her hands reached her now soft mid-section.
After the race, Haibara went to speak with Conan.
"I see you have noticed the... side-effects of the aptx 4698." She reached for her belly with her hand. "This was completely unexpected. Our metabolism seems to have been halved. I'm trying to work on a cure, besides the actual cure I mean; but for now, the only thing we can do is workout and watch what we eat."