The Sydney Diet Heart Study was conducted in Australia from 1966-1973. It evaluated substituting "heart healthy" vegetable oils rich in PUFA Omega 6 fatty acids for that known evil ......Saturated fat!
The take home points:
"Advice to substitute polyunsaturated fats for saturated fats is a key component of worldwide dietary guidelines for coronary heart disease risk reduction. However, clinical benefits of the most abundant polyunsaturated fatty acid, omega 6 linoleic acid, have not been established. In this cohort, substituting dietary linoleic acid in place of saturated fats increased the rates of death from all causes, coronary heart disease, and cardiovascular disease. An updated meta-analysis of linoleic acid intervention trials showed no evidence of cardiovascular benefit. These findings could have important implications for worldwide dietary advice to substitute omega 6 linoleic acid, or polyunsaturated fats in general, for saturated fats."
Read the whole thing!
Chalk another one up for the Paleo lifestyle!