Researchers suggest that Oreos cookies produce a similar effect on the brain and may be as addictive as morphine and cocaine.

Schroeder was quick point out that this was true for all high-fat and high-sugar foods and they had chosen Oreos as they were a handy device.
“Our research supports the theory that high-fat/ high-sugar foods stimulate the brain in the same way that drugs do. It may explain why some people can't resist these foods despite the fact that they know they are bad for them”, Schroeder said.
Source-Medindia