Daniel could have tried to justify eating the defiled food—after all, what else would he eat, and was this issue really worth taking a stand on? Yet Daniel knew that honoring God above all else should permeate every area of his life, including his diet. For Daniel, it was likely that the foods in question didn’t correspond with Jewish dietary laws and parts of the food had been sacrificed to idols. While our issues are different, the principle is still the same: God wants us to honor him in every area of our lives. Even what we do with our bodies should reflect his authority.
– Bible Gateway.Com