This vegetable is one of the top plant-based sources of tryptophan, which serves as a basis for the creation of serotonin, one of the brain's primary mood-regulating neurotransmitters. High levels of folate also add to asparagus's happiness-promoting profile; research has shown that up to 50 percent of people with depression suffer from low folate levels.
Like tryptophan, it's a necessary factor for creating neurotransmitters. It's also good to add to the menu if you plan on drinking. The enzymes in asparagus are highly effective in breaking down alcohol in your system, preventing a hangover—and that can make anyone happy.