Charles Ellicott Commentary Genesis 25:28

"Now Isaac loved Esau, because he did eat of his venison. And Rebekah loved Jacob." — Genesis 25:28 (ASV)

Because he did eat of his venison. — Literally, because the venison — that is, the produce of Esau’s hunting — was in his mouth; in our phrase, was to his taste — was what he liked. The diet of an Arab sheik is very simple (see Note on Genesis 18:6); and Isaac, a man lacking physical vigor and adventurousness — as is usually the case with the children of people far advanced in years — both admired the energy which Esau had inherited from Rebekah, and relished the fruits of it.