Figure 4 (they messed up the labels, figure 4 really shows blood glucose, not fatty acids)
Low blood glucose (below fasting level just 3 hours after the meal) results in hunger and drives the desire to snack. And snacks are often sugary as well.
Interestingly, the article says that the primary culprit is fructose, because it is rapidly metabolized through a different pathway from glucose. Table sugar is 50% fructose, soft drink HFCS is 55% fructose, and food additive HFCS (such as the one that goes into candy bars) is 42% fructose. So, they are all very close to each other.
