Lots of CVD events happen before the age of 70. This study has done nothing to remove survivorship bias. That in itself makes the study results contradictory.

Lots of CVD events happen before the age of 70. This study has done nothing to remove survivorship bias. That in itself makes the study results contradictory. If, for example, we assume egg consumption increases the risk of CVD, as other studies have shown, then if you’re someone who made it to the age of 70 while still consuming eggs you’re likely to be someone whose other factors, such as genetics or the rest of your diet, or your stress levels makes you less likely to get CVD. Even in that case, given a sufficient number of CVD related mortality events before the age of 70, this study would still show a negative correlation between egg consumption and CVD events on those over the age of 70. A further issue is that people who stop eating eggs completely are very likely to have done so for health reasons. In that sense, this study is very similar to the studies showing a slight health benefit to drinking 1-2 glasses of wine daily as opposed to not drinking at all. Once you account for the fact that the reason most of the non drinkers are non drinkers is because of bad health outcomes in the past in the first place, the wine drinking benefit disappears, and you get back to the positive correlation between alcohol consumption and ill health.