[BamaDave]

I agree that correlation does not equal causation, but it's not difficult for me to believe that a diet unnaturally high in trans-fats, which don't occur naturally in the human diet in large amounts, screws up blood lipid profiles. In the same vein, it's not hard for me to believe that overabundance of saturated fats in the diet does the same thing, since a more "natural" human diet would not include foods like butter, cream, and high fat cheeses, which are enriched for these fats over what occurs in nature.

Most trans-fat-containing foods are junk foods anyway and don't contain much of a nutritional punch aside from the dense amount of calories they provide.