Researchers out of the University of Montreal say a high-fat diet can actually cause "chemical changes" in the brain.
And those changes could lead to stress and withdrawal symptoms if you switch to a healthier diet.
The study was performed on mice for a period of six weeks.
In a news release, the study's author says the chemicals monitored in the mice are similar to those found in the human brain.
The study is published in the International Journal of Obesity.