"The parent comment is trying to dismiss an entire field and also preemptively dismiss new studies" If they're observational or survey based studies, they shou

"The parent comment is trying to dismiss an entire field and also preemptively dismiss new studies" If they're observational or survey based studies, they should be dismissed generally, or at least given incredibly little attention. Even worse they're usually 2nd order "I took some terrible observational studies, put them in a pile, and now I have a study of studies" bit of bunk that is a bit like CDOs: Just layer the junk and pretend it has value all together. We have decades of doing this now to have learned that it is extremely low value, and simply repeating the same pattern again with new biases and assumptions is not going to improve the situation. Nutritional studies are really, really hard, short of creating concentration camps and assigning diets to sections for decades. If you were studying physics by doing a survey on what people's opinion of gravity is or what their recollection of their acceleration rates for the past year, you'd probably not have great results.