The Compendium of Caraka 3.2.3

3.2.3

trividhaṃ kukṣau sthāpayedavakāśāṃśamāhārasyāhāramupayuñjānaḥ; tadyathā --- ekamavakāśāṃśaṃ mūrtānāmāhāravikārāṇām, ekaṃ dravāṇām, ekaṃ punarvātapittaśleṣmaṇām; etāvatīṃ hyāhāramātrāmupayuñjāno nāmātrāhārajaṃ kiṃcidaśubhaṃ prāpnoti//

Taking food, one should establish a threefold space in the stomach for food, namely: one space for solid food preparations, one for liquids, and one for vāta, pitta, and kapha; for taking food in such a measure, one incurs no harm arising from an improper measure of food.