the sunnah of our great prophet is clear with regard to wearing out one's body. continuous work, starvation, and staying up late are shunned out in islam. even overdoing acts of worship is considered a body abuse. the prophet disapproved some companions when one of them wanted to pray all night and never lie down, the other wanted to fast continuously, and the third wanted to refrain from marriage; all in the name of worshipping allah. the prophet immediately said, "i am the most god-fearing of you. yet, i observe prayer and i sleep, i fast and suspend fasting, and i marry women. he who turns away from my sunnah is not from my people" (al-bukhari). we cannot find any hadith that praises hunger except for fasting (al-qaradawi 27-28).