The amount of cash spent every year on "studies" in this world is beyond reasonable. Most of them are done very poorly, or are biased in one or more ways to "prove" someone's point.
You notice we never are given detailed analysis of the study in question, just the conclusions. Only about half the time do we even find out where it was done and who did it. Ever wonder why? Dig this stuff out, and often the whole motivation behind the study becomes obvious.
Even and odd years, coffee is good or bad for you, same thing about eggs, milk, and so much more. Who here really believes that having eggs 2 or 3 times a week is bad for you? The egg yolk has recently been discovered to contain proteins and enzymes that fend off dementia.