Researchers out of the University of Southern Canta Catarina in Brazil found that, over multiple months, the rats soda consumption caused memory impairment and oxidative stress in the brain.
Those biological stress markers increased significantly after 68 days of straight soft drink consumption. Those markers also had implications for behavior.
In one group, the rats were able to drink as much soda as they wanted but also had access to water, while the control group was offered only water. The cycle lasted for 67 days and on the 68th day, their brain tissue was analyzed.