[semimojo]

First of all, any study on this subject that is based on data outside of a clinical study with control groups is meaningless.

Ah yes. The old "we can never really know anything"" argument.

You asked for links. I provided multiple ones to multiple sources. I offered to provide many, many more.

You hand wave them away.

Bad faith.

[Alberta's Child]

The old "we can never really know anything"" argument.

Uh, no.

I have worked in a STEM field for nearly 30 years, and I know what a scientific study is.

I also know what a highly flawed statistical analysis is. I use them all the time -- because in a lot of my work that is the best we have. When I use these resources I include many caveats and disclaimers in my project documentation so the readers know the limitations of what I'm producing. I often warn my clients NOT to make major, consequential decisions on the basis of this work -- but to instead use this work as a foundation for something much more detailed, comprehensive and definitive.