But I like eggs damnit. Edit 1. My comment was made on a submission, which I did not think would gain much notice. Oops. Low quality comment to the fore! Edit 2. Really though, I eat a couple of eggs a day. I should scale it back anyway, as a hedge, and eat non-traditional (In USA) breakfasts, like rice and beans.
How many times have they flip-flopped back and forth on eggs alone? It's easy to get the impression that the people running these studies are either biased or simply don't know what they're doing.
It isn't ethical to lock people up and feed them a steady diet of something we might thing is going to cause them to develop some disease. So we have to rely on mostly self-reported data collected over extended periods of time.
That being said, I think the first pushback against eggs had to do with their high amounts of cholesterol. It was original assumed that dietary cholesterol intake was related to blood cholesterol levels. Which is something we now know to be false.
However, eggs are very high in saturated fats. The American Heart Associate still recommends that these be limited (from all sources) because there is a good deal of evidence that saturated fat intake contributes to elevated LDL cholesterol.
I generally trust AHA recommendations, but they are not free from bias, as they have food companies as "corporate supporters."