With the best of intentions its nigh on impossible to get enough people to eat a consistent diet of either high or low saturated fat for three decades and then compare the two groups.You can do it with rodents because they have to eat what they're given and can't sneak off to Maccy Ds for a double cheesburger (unless they escape). But then the argument will always be "but they're rodents not humans".So how can you know whether saturated fat has suddenly become safe for us? You would need epidemiological evidence over many decades and that, so far, shows the opposite.As fat became available in the UK after the war, cardiovascular problems increased. Later, towards the turn of the century they began to decrease again with the advent of statins. (with or without side effects.) I take my cue from the Blue Zones which have very little sat fat in their diets and very little diabetes or cardiovascular disease. Anyway I am not about to become a guinea pig for some tenuous unproven theory. Sat fat contains no essential nutrients not widely available so why eat it? 80% of diabetics die of cardiovascular disease. I see that as a reason to be extra careful.