A 1997 epidemiological study , which I just learned about, found that increases in saturated fat intake were associated with a lower risk of stroke. Sampling from among the papers that cited it, this study found a non-significant change in the same direction. This study found a significant change in the same direction in Japanese, who eat a low amount of saturated fat. This is especially interesting because many people assumed that the high rate of stroke among Japanese was due to high salt intake. This finding suggests it is due to low saturated fat intake.
As I said in a recent post , this sort of consistency across studies on a question of enormous interest argues against the severest critics of epidemiology, such as John Ioannidis .