Food and Mood

For the paper we are working on I am researching the effects of food on our mood.
The source I found very interesting is http://dujs.dartmouth.edu/2011/02/you-are-what-you-eat-how-food-affects-your-mood/#.WMcrQ4FHaEc .
During medieval times, people started to wonder how food affected their mood. “[...] [S]tudies suggest that foods directly influencing brain neurotransmitter systems have the greatest affects on mood [...] In turn, mood can also influence our food choices and expectations on the effects of certain foods can influence our perception.” Also, different foods will obviously have different effects on us.
According to the source, chocolate increases pleasant feelings and reduces tension. Caffeine has can enhance alertness, vigilance, and reaction time but to some it may increase anxiety. Omega-3 fatty acids can play a role in major depressive disorder, bipolar disorder, schizophrenia, substance abuse, and attention deficit disorder. In addition, insufficient amounts of thiamine of Vitamin B1 cause introversion, inactivity, fatigue, decreased self-confidence, and in general poorer mood. A lot of Americans suffer from iron deficiency and this can result in a depressed mood, lethargy, and problems with attention. Folic acid deficiency causes a depressed mood. Diets low in carbohydrates increase anger, depression, and tension.
Mood also affects our food choices. A study found that people watching a sad movie consume me more popcorn than people watching a happy and upbeat movie. The “happy” people consumed significantly more grapes than the “sad” people. Learned appetites also influence our food choices. Some smells of food can give us strong emotional feelings.