The Compendium of Caraka 3.1.25_8

3.1.25_8

nātivilambitamaśnīyāt; ativilambitaṃ hi bhuñjāno na tṛptimadhigacchati, bahu bhuṅkte, śītībhavatyāhārajātaṃ, &viṣamaṃ ca pacyate; tasmānnātivilambitamaśnīyāt//

One should not eat too slowly; for eating too slowly, one does not achieve satisfaction, eats too much, the food becomes cold, and it digests irregularly; therefore, one should not eat too slowly.