There’s a reason chocolate is so satisfying — it helps trigger dopamine production, and also boosts your levels of other feel-good hormones, like serotonin. And while you shouldn’t dig into a family size chocolate bar, a square or two of dark chocolate can increase your dopamine levels without ruining your diet. Choose a chocolate that contains at least 70% cocoa (the more cocoa solids, the better!) to keep your sugar intake low. Darker chocolate also has more antioxidants, which protect all your cells and tissues, including the ones in your brain. Break a dark chocolate bar into squares and keep them in the freezer to grab one on-the-go, or use dark chocolate chips in baked goods (like these yummy muffins, which can be made healthier by using whole-wheat flour).