"Jack!"
The moment he walked into the classroom for his Chemistry 203 class, a girl called his name and was waving him towards her.
At first, he wondered who she was. Analise had said she also had this class, so he was half expecting her to introduce herself, but this girl didn't look like Analise. Analise had been rail-thin, possible anorexic, but this girl looked healthy.
He walked over and said, "Analise?"
"Yay, you recognize me!"
"You look good."
She did. Once he had gotten closer, he could tell that much of her weight gain was muscle, not fat, though there was a thin layer of that as well. It made her look fit, healthy, and softly feminine.