Apparently, eating fast food puts you in a BAD MOOD . . . at least according to an author named Rachel Kelly who wrote a new book called "The Happiness Diet".
She says that it's because of all the trans fats in fast food, especially the fries. They mess with the levels of omega-3 fatty acids in your body, which can lead to you being pessimistic, aggressive, and depressed.
And fast food isn't the only food that she says will bum you out . . . basically EVERYTHING that tastes good will.
Some of the other foods that she says will put you in a bad mood are: Diet soda . . . sugary cereal . . . prepackaged donuts . . . shortening and margarine . . . salty snacks . . . and canned food.