The Compendium of Caraka 2.1.22

2.1.22

uṣṇāmlalavaṇakṣārakaṭukājīrṇabhojanebhyo 'atisevitebhyastathā tīkṣṇātapāgnisaṃtāpaśramakrodhaviṣamāhārebhyaśca pittaṃ prakopamāpadyate//

Pitta becomes aggravated by excessive indulgence in hot, sour, salty, alkaline, pungent foods, and eating before the previous meal is digested; as well as from intense exposure to the sun and fire, exertion, anger, and irregular diet.