"Happy Fats" is a term used by psychiatrists to refer to Omega-3 fats. Omega-3’s positive treating effect on mental diseases was found when Dr. Joseph R. Hibbeln performed cerebral anatomy in 1984. He realized that no one has ever done biochemical approach to treat mental illnesses before, even with the knowledge that brain is mainly composed of fats and that neurosis is caused by fats. As a result, they discovered that if 60% of the brain is fat, then DHA should be a massive part in brain and lack of DHA causes dementia and depression.

Human brain is known as the main user of DHA. Generally, adultery brains hold 29g of DHA in average, and deficiency in DHA calls for depression, violence and suicidal actions. Also, because DHA is directly linked to memory, loss of DHA for seniors leads to mental illnesses such as dementia. Medical School of Harvard University has already treated manic-depressive psychosis patients through consumption of fish oils with ample amount of DHA, and English researchers found out that DHA is very effective in treating schizophrenia.

The "Happy Fats" are located in various nerves and cells in our body and play very significant role in maintaining mental health as they transfers oxygen and other nutritive ingredients into the tissues. However, relative increase in Omega-6 intake and reduction in Omega-3 consumption will let Omega-6 to take Omega-3’s role and cause definitive problems.

According to Dr. Hibbeln's country analysis of fish consumption and depression (Washington Post), fish eating countries such as Japan, Taiwan, and Korea have less number of both depression and suicidal cases than less consuming countries – United States, Canada, Germany, and France. Also postpartum depression ratios showed line-drawing conclusions on amount of fish consumption. Dr. Hibbeln proposes Omega-3 as a key factor. Because the mother is the only source of DHA for embryos during pregnancy, sufficient DHA consumption is exceptionally important. As embryos cannot produce DHA, that consisits 20% of cerebrum cortex and 30-60% of retina, they need to be supplied by the mother as needed. There is high number of possibilities of delivering premature infants or premature delivery if DHA and EPA become scarce for mothers. DHA also affects brain development for children in growth phase, and prevents abnormal actions such as mental distractions, and inattentive manner. Pregnant women should consume plenty of DHA because they need to supply it to the embryos and if they don’t, it not only becomes an obstacle for infants’ brain development but also causes postpartum depression. Postpartum depression could happen to low fish consumption countries 50 times more than high consuming countries.