I was having a conversation with a reputable doctor and we where talking about people’s ‘mood’. One thing led to another and next thing I know is that he started to tell me about how hormones can influence our mood, especially serotonin. Read more on what is serotonin here and here. Know the tricky part is that there is no single hormone to rule our mood, because they interact with each other in different ways. All this is so complex that even the doctor himself said: ‘there are times when I think humans should not seek miracles using serotonin medicines or other exogene hormone, since the balance off all hormones is the key to our health”. Instead he recommend we diversify our activities and diet, so the body can balance his entire system the best way he knows to do this.