Vitality
Srimad-Bhagavatam
SB Canto 1
Overeating, over-sense gratification, overdependence on another's mercy, and artificial standards of living sap the very vitality of human energy.
SB 1.1.10, Purport: The devotees of the Lord are always anxious for the spiritual improvement of the general public. When the sages of Naimiṣāraṇya analyzed the state of affairs of the people in this age of Kali, they foresaw that men would live short lives. In Kali-yuga, the duration of life is shortened not so much because of insufficient food but because of irregular habits. By keeping regular habits and eating simple food, any man can maintain his health. Overeating, over-sense gratification, overdependence on another's mercy, and artificial standards of living sap the very vitality of human energy. Therefore the duration of life is shortened.