The study focused on overweight men, but it's not a stretch to think a similar result could happen to other cohorts. The results were also pretty significant, which basically means the results were pretty much the same form everyone in the trial.
They compared the blood sugar levels of the subjects in the trial over a period of time after eating a high-GI or low-GI meal. GI refers to the Glycemic Index which is a measure of how high the sugar content of a certain food or meal is. The high-GI meal has more sugar in it. They also measured for signs of hunger and reward in e period after eating the meals.
What they found was that after the high-GI meal blood sugar was significantly higher for the 2 hours following the meal when compared to the low-GI meal. No surprise there and nothing that you wouldn't expect. What they then went on to do is measure signs of hunger. Interestingly the high-GI meal actually made the subjects hungrier 4 hours after they consumed it than the low-GI meal did. This would be linked to the insulin response curve and not entirely unexpected.
Another interesting thing they found was that the high-GI meal stimulated different areas of the brain. Specifically it stimulated areas that are associated with cravings and rewards. Interestingly this suggests that sugary food can have an impact on cravings, and could actually cause some degree of addiction. That's a really interesting bit! A sugar addiction that will have you craving foods high in sugar. What foods tend to be high in sugar? Processed foods, fast food and pretty much most stuff that comes out of a packet. Great for the processed food industry... Eat their food and within 4 hours you could physically be craving more!
We wouldn't suggest having a massive overhaul of your life based on the results of one scientific study carried out on overweight men in America, but it does add more weight to the argument that sugar is bad for us in the levels we consume it nowadays. We think the advice stays the same really - try to eat fresh produce, grown organically without additives, that you cook yourself and you'll be onto a winner. Avoid processed foods and pretty much most stuff that comes out of a factory and you'll be reducing in take of a whole range of 'nasty' chemicals.