Eating a lot kills the heart, causes rebellion and lack of control. Hunger is one of the good characteristics of the believer. Yahya ibn Ma’az said: If you ask all the angels, the seven skies, 124000 prophets, any book, guardian and Imams to intercede to reconcile you with your soul and encourage the soul to abandon the world and obey God, it (the soul) will not accept; but if you ask hunger to intercede on your behalf, (the soul) will accept your request and will obey you [1].
[1] Ayatollah Hassanzadeh Amoli, Nameha, Barnameha, Page 127.
source : Shafaqna