I was curious to compare the ingredients and nutritional value of the two varieties of soy milk in my refrigerator: Organic Valley Soy Vanilla, and Silk Unsweetened Soymilk. Staring at the nutritional labelling, I couldn't get past the beginning. Two half-gallon containers. Both say "Serving size: 1 cup." The Organic Valley carton says the expected, "Servings per container: 8," whereas the Silk Unsweetened says, "Servings per container: 4."
When kids would come to me for tutoring in mathematics, I would often feed them cookies, claiming this would help their "math brains." I offer the above as evidence that sugar is, indeed, important for correct mathematical thinking.