Multiple choice Which of the following substances keeps the foodstuff moist? An emulsifier Glazing agents A humectant A preservative Reveal answer Fill a bubble to check yourself C Correct answer Explanation A humectant is a hygroscopic substance. When used as a food additive, the humectant has the effect of keeping the foodstuff moist. Humectants are sometimes used as a component of antistatic coatings for plastics.