To test my idea about the unsaturated-to-saturated fat ratio being important for cardiovascular health, I wanted to focus in on this study . This study, unlike other ones I’ve cited, directly compares oil to oil. It tests butter versus olive oil in diabetes patients.
So there you have it, butter substantially reduces flow-mediated dilation (FMD), while olive oil is generally neutral.
If you calculate the unsaturated-to-saturated fat ratio for the two meals used in the study, you get:
Olive Oil 5.8:1
Very different ratios, and very different results on vascular health.