A variant of the proverb meaning 'too much is as bad as too little'—excess can be harmful and moderation is important.
健康管理でも過ぎたるは猶及ばざるが如し。運動も食事も過剰は良くない。
Even in health management, too much is as bad as too little. Excessive exercise or dieting is not good.
彼女は仕事に熱心だが、周囲の同僚が『過ぎたるは猶及ばざるが如し』と注意した。
She is dedicated to her work, but her colleagues warned her, saying 'too much is as bad as too little.'