Not a single part of grain can be digest without the power of Divine-God.

And I existing in the body of creatures in fire-form inclusive of Pran (life-force) and Apaan digest four types of foods. (Bhagwat-Gita: 15/14)

Divine-God had explained his power of lighting and heating in stanza 15/12, here he mentioning his digesting power in form of fire. To make movable and immoveable creatures healthy and to protect them Divine-God exist in their body. Divine-God help plant, anima, bird and human etc., to grow and remain healthy by facilitating balance nutritious diet and digesting power.

The role of Pran (Life-Force) is to facilitate exhale or breath-out and digesting system and carry digested micro energy form food to different parts of body.

The role of Apaan is to facilitate breath-in or inhale, excrete waste from body and delivery of baby from female body.

Living being consumes food through four ways:

1.     Chewing food by teeth like bread and rice etc.

2.     Swallowing liquid food like milk and juice etc.

3.     Sucking with teeth like eating mango and sugarcane etc.

4.     Licking like consuming chatni/ketchup, honey sauce and jam etc.

Not a single part of grain can be digest without the power of Divine-God.