German news website
www.astrazeneca.ch/astrazeneca/news/ astranews/1994/a05/art03.html

Polyunsaturated Fat Deposits
British Researchers Criticize New Diet Trend

(azpd) Polyunsaturated fatty acids are perhaps in the long run not as healthy for heart and vascular health as we once believed. British researchers found larger quantities of it in arterial deposits. Thus they formed deposits in arteries where one believed deposits were prevented by these types of fatty acids.

Up to now polyunsaturated fatty acids as they occur, for example in fish, were considered as actual protective agents against myocardial infarction. This opinion relied on epidemiological medical investigations. Humans, who eat a great quantity of fish, rarely suffer from heart and vascular diseases according to these studies. Dietary agencies thereafter formulated recommendations based on these studies.

The researchers, who now report skepticism, examined the fat content of the blood, the fatty tissue and the deposits in the blood vessel walls of deceased humans. The composition of the blood fats and the fatty tissue reflects rather exactly the intake of the different types of fats. The more unsaturated fatty acids that were present in the blood, the more unsaturated fatty acids were present in the arterial plaque deposits.

Still polyunsaturated fatty acids are absolutely necessary for health. It is important above all to maintain the measure of fat in the diet with saturated and unsaturated fatty acids in a balance.
- AstraZeneca-Pressedienst - 22 November 1994

Source:
Felton CV et al: Dietary polyunsaturated fatty acids and composition of human aortic plaques. Lancet 1994; 344:1195 1196

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My personal conclusion from this study is that it doesn't matter what types of fats you eat or what types are in the blood because there is some other mechanism that causes fat to clog arteries other than the type of fat you eat or have in your blood. My vote is high carbohydrates and subsequent insulin spikes.