How to Fast as a Christian
By The Quiethaven Editorial Team
Christian fasting is not a diet, a wellness trend, or a productivity hack. It is a spiritual discipline practiced by Jesus, the apostles, and the Church for two thousand years. This is a practical guide to why we fast, what to fast from, when, and how to begin without injuring yourself.
Why Christians fast
Jesus assumed his followers would fast. He did not say "if ye fast" but "when ye fast" (Matthew 6:16). Fasting is not bargaining with God. It is making space — physically, emotionally, in your schedule — so that prayer can deepen and the soul can hear. When the stomach is empty the will is exposed, and the will is where God meets us.
Three kinds of fast
- Full fast — no food, only water, for a defined period (one meal, one day, longer). Used in serious discernment or repentance.
- Partial fast — abstaining from specific foods. The "Daniel fast" (Daniel 1, 10) excludes meat, sweets, and rich foods. Orthodox fasting rules are detailed and varied by season.
- Non-food fast — abstaining from a media, an app, alcohol, or a comfort. Modern, but biblical in spirit ("flee from idolatry" — 1 Corinthians 10:14).
When to fast
Most Christian traditions fast on Fridays (commemorating the crucifixion) and during Lent. Orthodox Christians additionally fast during Advent, the Apostles' Fast (after Pentecost), and the Dormition Fast (August). Spontaneous fasts before a big decision, on a hard anniversary, or in intercession for someone are also longstanding practice.
How to begin (without injuring yourself)
- Start small. Skip one meal. Fast from sugar for a week. Don't begin with a 40-day fast; you will fail and learn the wrong lesson.
- Drink water. Even on a full fast, dehydration is dangerous. Water is permitted in nearly all Christian fasting traditions.
- Pray during the meal you skip. The point isn't the missed meal; it's the prayer that fills the time.
- Don't tell people. "When thou fastest, anoint thine head, and wash thy face; that thou appear not unto men to fast" (Matthew 6:17-18).
- Eat gently when you break. A heavy meal after a fast undoes the goodwill of the practice.
When NOT to fast
Pregnancy, breastfeeding, diabetes, eating disorders, certain medications, hard physical labor — fasting from food is contraindicated or dangerous in any of these. Fast from media or an indulgence instead. If you have any history of disordered eating, speak with a doctor before fasting from food.
The point
Fasting is one of three classic disciplines Jesus named together: prayer, fasting, almsgiving (Matthew 6). They lean on each other. A fast without prayer is just hunger; prayer without the body is often only mental. Quiethaven's prayer timer is built for exactly this — a gentle frame for the prayer that fills the time you would have spent eating. See the Bible app →
About the author
The Quiethaven Editorial Team — The Quiethaven editorial team writes about Bible reading, prayer and the Christian year, with theological review across Protestant, Catholic and Orthodox traditions.
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