New study shows nuts reduce cardiovascular disease risk up to 55%
anti-agingfirewalls.com
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Specifically, several confounding variables in the data could have accounted for part of the “nut effect”. The confounding variables included BMI, smoking, and exercise. Those that consumed nuts and ate a Mediterranean diet also had a lower BMI, a lower waist circumference, were less likely to smoke, and were more physically active. These factors may have “skewed” the results in favor of the “nut eaters.”
Also, the people who eat more nuts are probably eating less of something else. Since nuts are frequently eaten as snacks, it's likely that they're eating nuts instead of sugary, processed food like cookies or candy. So the improved health could be the result of what they're not eating rather than what they are eating.
Edit: Reading the article reminded me of this paper:
"Why Most Published Research Findings Are False" (2005)
By John P. A. Ioannidis
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1182327/
There's also a discussion of Ioannidis' work here:
"Lies, Damned Lies, and Medical Science" (2010)
http://www.theatlantic.com/magazine/archive/2010/11/lies-dam...
i.e. it was the culture of eating rather than the content of the diet that made it healthy.
(Rather than "clean your plate", "second helpings", and "eat til you're full")
Edit: here is a link for the French diet https://en.wikipedia.org/wiki/French_paradox
It's more of a linguistic categorization than anything else.
And even though they may share some dietetic properties, well, Brazil nuts are one thing, Almonds are another, Pistachios are another.
BTW i have a 90yr old dad who consumes roasted and salted peanuts daily. YMMV
But then, the very idea of "healthy" and "unhealthy" foods is a fallacy. What's healthy or unhealthy is your diet in its entirety.