The pronoun in «عَلَىٰ حُبِّهِ» admits two well-known interpretations. If it refers to the food, the charity is performed despite the giver's desire or need for it. If it refers to love of God, the phrase emphasizes devotion and sincerity as the motive for giving.
In both interpretations the added expression has rhetorical value, but the value differs: the first highlights self-sacrifice, and the second emphasizes motive and devotion. It is important not to erase the distinction between these two interpretative routes.