ayuno

noun
  1. The act of abstaining from all or some kinds of food or drink, especially as a religious observance. noun
    During Lent, many Christians practice ayuno as a form of penance.
    She decided to start an ayuno to detoxify her body.
  2. A period of time during which one abstains from eating. noun
    The doctor recommended an overnight ayuno before the blood test.
    He broke his ayuno with a light meal at sunset.