A study was done at UCLA, where researchers found that rats that were fed water with fructose were not as quick in maze-navigating as rats that were fed plain water.
This could be due to how the brain responds to insulin after consuming fructose.
Conclusion: A high fructose intake is harmful for the brain and the body.
In USA high-fructose corn syrup is used in many manufactured foods, sweeteners and preservatives. Quite a few studies have been done about sugars and the harm sugar does to the body.
Earlier studies have shown that too much sugar has negative effect on obesity, diabetes and blood-fats, raises triglycerides and has negative effect on the liver in response to insulin.
Now they are even showing how negative sugar is for the brain too!
High-fructose corn syrup is cheaper than other sugare, therefore very frequently used in many foods.