http://www.nutrilite.com/en-us/Nature/Nutrients/omega-fatty-acids.aspx

From this web page: http://www.nutrilite.com/en-us/Nature/Nutrients/omega-fatty-acids.aspx

"There are no known side effects associated with increasing your intake of omega-3 fatty acids through foods, although fish oil capsules do pose the risk of a "burp" factor – a harmless, sometimes unpleasant, fishy aftertaste that occurs with some brands of fish oil capsules."

Dr. Raymond Peat argues that increasing omega-3 to balance the 6s is problematic. http://raypeat.com/articles/articles/fats-degeneration3.shtml

Interesting topic. It seems that the omega-3 to omega-6 ratio is relevant in terms of health. In other words, the imbalance of PUFAs in favour of omega-6s would increase the risk for a pro-inflammatory state, for instance. Low-grade systemic inflammation is a common pathway for most common noncommunicable diseases (NCDs), such as diabetes, obesity, cardiovascular disease, depression, and even cancer, to name a few. These chronic conditions are frequently comorbid and, of note, their prevalence has risen significantly in the last decades. Explanations include lifestyle factors, such as nutrition/diet. According to some, secular changes in the fat content of diets might explain this increase, especially in Western countries. For instance, Simopoulos has suggested this from an evolutionary perspective. In addtion, specific nutrients may play a role but it is sensible to take a broader perspective in terms of healthy vs unhealthy dietary patterns. It seems that the shift-away from traditional diets (e.g. Mediterranean diet) towards unhealthy, poor diets (e.g. Western or cafeteria diets) increases the risk for some NCDs. For instance, high adherence to Mediterranean diet has been associated with a decreased risk for CVDs, diabetes, and depression, according to several epidemiological studies, such as the PREDIMED study and the SUN cohort study in Spain. You may want to read some papers by F Jacka on this topic.