Every 5 or 10 years there is a big study that gives rise to a health fad: antioxidants, low fat, high fat, low carb, no carb, complex carbs, red wine, ...

These are then almost predictably found to either be bunk or gross oversimplification 5 or 10 years later.

You would think the scientific and medical establishment would realize after a while that there must be something deeply wrong with their whole approach to these studies and their interpretation, but no. The next one is always a breakthrough and around the circle we go. Or are there industries making big bucks on pimping this stuff?