Ashtangasamgraha 36.23

36.23

nātyuṣṇaśītaṃ laghu dīpanīyaṃ rakte 'panīte hitamannapānam |

tadā śarīraṃ hyanavasthitāsṛgagnirviśeṣāditi rakṣitavyaḥ ||

cippamakṣatarogaṃ ca vidyādupanakhaṃ ca tam ||

Once blood has been removed, wholesome food and drink is that which is neither too hot nor too cold, light, and digestive-fire-stimulating;
For at that time the blood of the body is unsettled; therefore, the digestive fire must be especially protected.
One should know cippa and akṣataroga and that upanakha [to be the same].