this past week Jack Norris wrote an even more wonkish piece on the same
https://jacknorrisrd.com/nutrition-research-what-you-should-know/comment-page-1/#comment-12178
If you're at all interested in this topic, I hope you’ll read both; his is a more in depth discussion and this one is a faster overview. It’s an issue that comes up frequently in the comment...
https://jacknorrisrd.com/nutrition-research-what-you-should-know/comment-page-1/#comment-12165
For an explanation of the different types of studies and their pros and cons, please see the article Basics of Nutrition Research.
https://jacknorrisrd.com/nutrition-research-what-you-should-know/comment-page-1/#comment-1019