Fried Anything
Fried chicken, fried Oreos, even French fries - these are all foods that may comfort you on a bad day. But ultimately, they'll leave you feeling sluggish and depressed. Replace your lunchtime fried chicken with a turkey sandwich, which will increase the production of serotonin, leading to an improved mood. As for substituting your fried desserts, you're kind of screwed...
[Photo via @bbestfooddallas]