From the Orthodox Church Fathers' teachings, fasting is much deeper than just abstaining from certain foods.

Here's their understanding:

- St. John Chrysostom emphasizes that true fasting begins with the mouth - controlling not just food, but also harmful speech

- St. Basil the Great teaches that fasting must be accompanied by spiritual efforts: "Fasting with the body while continuing to sin is like flying with one wing"

- St. John Cassian warns against pride in fasting, teaching that vainglory can destroy its spiritual benefits

- St. Gregory Palamas teaches that authentic fasting involves all senses:

  - Eyes: Fast from impure looks and unnecessary entertainment

  - Ears: Abstain from gossip and idle talk

  - Tongue: Refrain from judging others and speaking evil

  - Hands: Cease from harmful actions

  - Mind: Control thoughts and desires

- St. Isaac the Syrian explains that fasting is not meant to punish the body but to:

  - Subdue passions

  - Clear the mind for prayer

  - Cultivate humility

  - Remember the poor

  - Practice self-control

- St. John Chrysostom emphasizes that money saved from fasting should be given to the poor: 

"The fast should be kept not by the mouth alone but also by the eye, the ear, the feet, the hands and all the members of the body"