Can sugar make you stupid?

Sweet drinks scrambled the memories and stunted learning in lab rats in a new study-leading to "thigh concern" over what sugary diets may do to people, according to neuroscientist Fernando Gomez-Pinilla.

For the study, Gomez-Pinilla's team first trained rats to successfully navigate a maze, giving them only water and standard rat chow for five days. During the following six weeks, the rats' water was replaced with syrups that were 15 percent fructose.

"Most sodas people consume are about 12 percent sugar, so imagine if you drank soda with sugar added instead of water," said Gomez-Pinilla, of the University of California, Los Angeles.m

During the six-week period, half the rodents were also given flaxseed oil and fish oil-both rich in omega-3 fatty acids. These antioxidants may protect against damage to chemical connections in the brain called synapses, past research suggests.

After six weeks of the fructose syrup, all the rats were slower at running the maze. However, those that had received omega-3s were slightly faster than their counterparts, Kazinform has learnt from National Geographic.

By studying the dissected brains of the study rats, the researchers determined that the high-fructose diets had sabotaged the ability of synapses to change, a key factor in learning. The sugary drinks had also disrupted the sugar-regulating protein insulin in a brain area called the hippocampus, which play a role in memory formation in both rats and humans.

"I was very shocked to see how strong an effect these diets could have on the brain-I have high concern that the foods people eat can really affect mood and cognition," Gomez-Pinilla said.

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