Diet

मात्रया अपि अभ्यवहृतं पथ्यं चान्नं न जीर्यति । चिन्ता शोक भय क्रोध दु:ख शय्या प्रजागरै: ।। – चरक

Sattvik people take an appropriate and adequate diet. Rajasik people eat tasty dishes till their stomach is full. Tamasik people do not have control over their taste buds and hence they overeat.