If you make a beeline for fatty comfort food when you’re having a bad day, read carefully: Sweets and high-fat snacks can make you feel even grumpier than you already are!

Behavioral health specialist Dr. Kristin Heron says that sugary foods make your blood glucose levels go up and down like a rollercoaster. And neurologists believe that erratic blood sugar causes brain chemistry changes that can lead to depression. For example, B vitamins help regulate mood. But your body also uses vitamin B to digest sugar. So, overdosing on cupcakes can create a vitamin B deficit that can cause a serious case of the blues.

The good news is: There are plenty of healthy foods that contain mood-boosting chemicals. For example, wild salmon has omega-3s, broccoli has folic acid, and green tea contains a compound called theanine– all of which have been scientifically proven to improve mood.

But if you’re still craving comfort food, stick with chocolate, the darker the better. According to the Journal of Psycho-pharmacology, chocolate stimulates the production of feel-good endorphins. It also contains serotonin, which acts as an anti-depressant.