This is chapter 8 from “Mama ga Iku! Boku wa Dopyu!” tankoubon. I’ve been meaning to do it since March, but there was always something… I think I’ll do some more Tange Suzuki’s stuff after this.
A couple of notes: the word ダイエット(daietto) does come from English word “diet”, but in Japanese its meaning is expanded to include any other means of losing weight, such as exercise. ぱこぱこ(pako-pako) is actually an onomatopoeia that describes the sound of two bodies slapping against each other.