快食 かいしょく
kaishoku

Noun

1. eating well; (having a) good appetite

快便 かいべん快食 かいしょく快眠 かいみん健康 けんこうのしるし。
kaibin kaishokukaiminwa kenkōno shirushi.
A good appetite, sound sleep, and regular motions are the three signs of good health.