noun
mini-fast; short fast
A short, casual fast, often for health or weight management. プチ comes from French 'petit' meaning small.
週末にプチ断食を始めてみた。
I tried starting a mini-fast over the weekend.
プチ断食は、16時間だけ食事を抜く方
A mini-fast is a method where you skip meals for just 16 hours.