What makes the kids aggressive is the high fructose corn syrup. My husband and some of our kids get quite agitated when they have this. We learned over 20 years ago to avoid this chemical substitute fake sugar. We live much happier lives to just having regular cane sugar. We see no problems with aggression when we have pure cane sugar sodas. Also, since I do not have the HFCS very often, when I do, I get end up with a terrible headache.