John Calvin Reformed @genevareformer

Now this surprising event took place, — Daniel contracted neither leanness nor debility from that mean food, but his face was as shirting as if he had continued to feed most delicately; hence we gather as I have already said, that he was divinely impelled to persist firmly in his own design, and not to pollute himself with the royal diet.

Matthew Henry Presbyterian @wholebiblehenry

We observe here, very much to our satisfaction, I. That Daniel was a favourite with the prince of the eunuchs (Dan 1:9), as Joseph was with the keeper of the prison; he had a tender love for him. No doubt Daniel deserved it, and recommended himself by his ingenuity and sweetness of temper (he was greatly beloved, Dan 9:23); and yet it is said here...

Commenting on Daniel 1:8-16

John Gill Reformed Baptist @doctorgill

And at the end of ten days their countenances appeared fairer, and fatter in flesh,.... At the time fixed for the trial of them, when they came to be examined, they appeared to be of a better complexion, and a more healthful look, and even plumper and fatter, with good solid flesh, and not swelled up as persons in a dropsy: than all the children...