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Of the unsaturated fats, some are healthier than others.
Some of the omega-3s and 6s are the only truly essential fats. Scientists deem a nutrient essential when it cannot be produced by the human body, so they must be present in the foods that humans eat.
The problem, according to numerous researchers, is that the typical American diet is imbalanced. People get too many omega-6s and not enough omega-3s. Since the American diet is becoming popular in other industrialized countries, this could be a worldwide problem. The imbalance is a long-term health problem.
It can take years for the health effects to become noticeable, although becoming overweight or obese is one effect that may be seen in the earliest years of a persons life.
Studies have shown that many diseases are directly related to unhealthy diet. Consequences of imbalance Measuring blood lipids or fats is one way to see the problem. Too much saturated fat or too many omega 6s will cause high LDL or bad cholesterol levels and low HDL or good levels.
LDLs are bad because they clog the arteries. HDLs are good, because they help to remove LDLs from the bloodstream. The underlying problem caused by imbalanced intake of omega 3 6 fatty acids is inflammation. The two fats compete for conversion into pro-inflammatory or less inflammatory hormones.
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Source: (omega 3 6) http://omega3information.com/455/omega-3-6/