Broccoli effects your thoughts and moods by creating higher levels of happiness, creativity and curiosity. No wonder why vegans are always happy.
Broccoli makes you happy? I beg to differ. It is a vegetable, not cake! However, broccoli is good for the health of your brain and controls your moods. It refreshes the mind and allows you to think more clear (which is probably the reason why our parent always say, "eat your vegetables", because they want us to do well in school). Broccoli,like other vegetables, contain high levels of Dopamine. The University of Otago's psychologist, Tamlin Conner, says that, "One possible explanation is the micronutrient content of vegetables and fruits." Dopamine is a neurotransmitter that heightens motivation and improves engagement, hence the reason why it takes a large role of a healthy mind.

Source
The Food Revolution Network
Works Cited
"Broccoli Makes You Happy - Food Revolution Network." Food Revolution Network. Web. 28 Sept. 2014. <http://foodrevolution.org/blog/broccoli-makes-happy/>.