Daniel 1:11-15

   11: Then said Daniel to Melzar, whom the prince of the eunuchs had set over Daniel, Hananiah, Mishael, and Azariah,
   12: Prove thy servants, I beseech thee, ten days; and let them give us pulse to eat, and water to drink.
   13: Then let our countenances be looked upon before thee, and the countenance of the children that eat of the portion of the king's meat: and as thou seest, deal with thy servants.
   14: So he consented to them in this matter, and proved them ten days.
   15: And at the end of ten days their countenances appeared fairer and fatter in flesh than all the children which did eat the portion of the king's meat.