Where is the mention off effort and period?
OK, I'm out.
Those are the extracts / summaries of the studies I found a few years back. If you don't like their conclusions, by all means, feel free to reject them.
If you feel sufficiently motivated, by all means search out your own scientific evidence on the subject (and I don't just mean somebody's opinion on a webpage...).
As things stand, though, you don't appear to be truly challenging the rationale or method - but arguing because you don't like the conclusion. And that's your choice.
Thing is, you'd partly got there with some of your own comments, which I had hoped were just about to trigger some epiphany, but it doesn't appear to be.
People can spend ages arguing their opinion, what they believe, what makes sense to them, in spite of, or in denial of other things - and that's your choice. But I've said my piece, I've supported it with previous research. If that ain't good enough, then feel free to carry on believing what you choose.
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