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WHY DO WE FAST?

People fast for three main reasons: spiritual discipline, religious observance, and physical health. By abstaining from food or specific activities, fasting is used to center the mind, deepen religious devotion, and allow the body's digestive system to reset.

Fasting serves different purposes depending on the core motivation:

1. Spiritual & Religious Reasons

Across major religions, fasting is a centuries-old practice designed to humble the body, clear the mind of distractions, and draw closer to the divine.

    • Christianity: Often tied to prayer, believers fast to seek God's guidance, express repentance, or rely on spiritual rather than physical nourishment.

  • Islam: During the month of Ramadan, healthy Muslims fast from dawn to sunset as one of the Five Pillars of Islam. It builds empathy for the poor and self-discipline (Taqwa).

  • Judaism: Fasting on holy days like Yom Kippur is a means of atonement and afflicting the soul to seek forgiveness.

  • Buddhism & Hinduism: Monks and practitioners often fast to promote mindfulness, break attachments to worldly desires, or as part of a meditative lifestyle.

2. Health & Wellness

In recent years, protocols like intermittent fasting (IF) have surged in popularity for health and fitness. Common protocols include the 16:8 method (fasting for 16 hours, eating in an 8-hour window) or alternate-day fasting.

  • Metabolic Switch: When the body runs out of sugar (glucose) to burn, it begins breaking down stored fat.

  • Cellular Repair: Fasting may stimulate autophagy, a process where cells clear out damaged components, which some studies suggest could aid in longevity.

  • Blood Sugar Control: It is sometimes utilized to improve insulin sensitivity and manage weight. 

Whether practiced to quiet the mind for prayer or to improve metabolic health, fasting is fundamentally about intentional self-control and resetting the body or soul.

Disclaimer: Fasting for physical health should be done with caution. Always consult a healthcare provider or registered dietitian before starting an extended fast, especially if you have pre-existing medical conditions like diabetes.

Purpose of Fasting

1. To strengthen prayer (e.g., see Ezra 8:23)

Numerous incidents in the Old Testament connect fasting to prayer, especially intercessory prayer. Fasting does not change whether God hears our prayers, but it can change our praying. As Arthur Wallis says, “Fasting is calculated to bring a note of urgency and importunity into our praying, and to give force to our pleading in the court of heaven.”²

2. To seek God’s guidance (e.g., see Judges 20:26)

As with prayer, fasting to seek God’s guidance isn’t done to change God but to make us more receptive to his guidance.

3. To express grief (e.g., see 1 Samuel 31:13)

Expressing grief is one of the primary reasons for fasting. Ever notice that when you’re moved to tears by grief you lose the urge to eat? When we grieve, our family and friends often have to plead with us to eat because our body’s appropriate response to grief is to fast. A prime example occurs in 2 Samuel 1:12, where David and his men are described as having “mourned and wept and fasted till evening” for their friends, their enemies and their nation.

4. To seek deliverance or protection (e.g., see 2 Chronicles 20:3 – 4)

Another common reason for fasting in the Old Testament was to seek deliverance from enemies or circumstances. In Scripture, this type of fast is generally carried out with other believers.

5. To express repentance and a return to God (e.g., see 1 Samuel 7:6)

This type of fasting helps us to express grief over our sins and shows our seriousness about returning to the path of godly obedience.

6. To humble oneself before God (e.g., see 1 Kings 21:27 – 29)

“Remember that fasting itself is not humility before God,” reminds Donald Whitney, “but should be an expression of humility.”³

7. To express concern for the work of God (e.g., see Nehemiah 1:3 – 4)

As with Nehemiah, fasting can be a tangible sign of our concern over a particular work God is doing.

8. To minister to the needs of others (e.g., see Isaiah 58:3 – 7)

We can use time we’d normally spend eating to fast and minister to others.

9. To overcome temptation and dedicate yourself to God (e.g., see Matthew 4:1 – 11)

Fasting can help us focus when we are struggling with particular temptations.

10. To express love and worship for God (e.g., see Luke 2:37)

Fasting can show, as John Piper says, that “what we hunger for most, we worship.”⁴

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