3. Asparagus

Asparagus contains high amounts of triptophan, a compound that is known to naturally stimulate the secretion of serotonin. In other words, asparagus is one of the veggies that are known to be great mood regulators. At the same time, it is very rich in folate and it contains numerous other beneficial enzymes that will keep you happy, provided that you consume two to three servings of asparagus per week.