Chandogya Upanishad is one of the oldest Upanishad written on the Vedic Brahmana period about ninth to eighth century BC. Chandogya Upanishad is associated with Sama Veda. It is ranked ninth in the Muktika canon of hundred and eight Upanishadas. The 5th Khanda of Chapter Six of Chandogya Upanishad states about the threefold nature of food. Food when eaten becomes threefold. The gross particles in it become excrement, the middling ones becomes flesh, and the fine ones become the mind. Water when drunk becomes threefold. The gross particles become urine, the middling ones becomes the blood, and the fine ones becomes the respiration (prana). Heat when consumed becomes threefold. The gross particles become bones, the middle ones become marrow and the fine ones become the speech. The mind consists of food, the prana of water and speech of heat.
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