Nightshift "probable" cause of cancer

That's right. They have proven a correlation between the two. Now, "probable" cause only means that the link is plausible. Notice that I said correlation, which simply means there is an identifiable relationship, not necessarily a dependent relationship. One likely component is Melatonin, which is produced by the body at night, in the dark, and is dependent on the bodies biological clock. The study was done on airline attendants and hospital workers (nurses). A larger study is necessary.

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