The sound (prayer) before eating initiates the body and tune the mind towards eating event. From the scriptures, the sound of Sanskrit words used in this Bhojana mantra is totally meant about the food, its composition, its process of reaching us and its digestion inside.
Aham Vaishvaanaro Bhutvaa Praaninaam Dehamaasritaha
Praanaapaana samaayuktah Pachaamyannam Chaturvidham
Meaning: I, the supreme spirit, abide in the body of living beings as the Fire (Vaiswanara) in their stomach. I associate with their Praana and Apaana, digest the four types of foods (solid, fluid, semi-fluid and liquid) which they eat.
Brahmaarpanam Brahma Havir Brahmaagnau Brahmanaahutam,
Brahmaiva Tena Gandhavyam BrahmakarmaSamaadhinam.
Meaning: The whole creation being the gross projection of Brahman, the cosmic consciousness itself; the food is Brahman, the process of offering it is Brahman, it is being offered in the fire of Brahman. He who thus sees that Brahman is action reaches Brahman alone.
This is still happening in many homes, schools, and at-least in Gurukulam (traditional schools). The importance of chanting and mindful eating will help in curing the digestive problems like Irritable bowel syndrome, constipation, indigestion, etc. and enhance the balanced health of whole digestive tract. This tradition has to be implemented in yoga teacher training as part of Indian tradition than the classroom curriculum alone. This helps in overall personality development that is the Yogic lifestyle with Yoga teacher training.