When I make him exercise, his appetite increases and his weight increases even more! How troublesome!
"When I make him exercise"＝「彼に運動させると」
"his appetite increases"＝「彼の食欲は増して」
"and his weight increases even more!"＝「そして彼の体重はさらに増えてしまう！」
"How troublesome!"＝「なんて面倒なんだろう！」
Sentence in context:
"I made him exercise so that he can lose some weight, but it seems like he is gaining more weight, because his appetite increases when he exercises."
アメリカ合衆国 
