MIAMI (CBS4) – If you ever think I’m not making much sense, it may be that I’ve gone too long without eating junk food, although that’s not much of a problem during the holiday season when fatty and sugary treats are everywhere.

Joking aside, a new study in mice suggests that eating junk food can change the brain, spurring symptoms of anxiety and depression if you stop consuming it.

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The University of Montreal researchers fed some mice a high-sugar, high-fat diet and found the changes in the brain kicked in even before the mice became obese.

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That’s because once you get used to junk food, your brain launches you into a vicious cycle of bad eating.

The bad diet triggers biological changes similar to addiction.  A change from that diet then leads to withdrawal symptoms and greater sensitivity to stress and depression than mice who were fed a low-fat diet.

A separate study in the journal Neurology also found a relationship between having high blood amounts of trans fats and decreased performance on brain tests and smaller brain volume.

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I had McDonald’s for lunch.  You can draw your own conclusions about my brain function.