On October 7, the Daily Mail headlined a podcast talk in which nutritionist Gabriela Peacock, founder of the supplement brand that sponsors the show, said the selenium in Brazil nuts is “very important for your hair”. The headline is a question, then a promise with a hedge. “Do you eat Brazil nuts?” pulls you in, “superfood” hands you a verdict, “thinning hair” names the fear. The verb is “could do”, which promises nothing and lets you fill in the rest. The article gives Peacock one hair line: selenium is “very important for your hair”. It names no study, no dose in micrograms and none of the “experts” it cites. The tell: a promise about your body with a soft verb and no number in it. The page says what the headline leaves out. Its second paragraph names GP Nutrition, Peacock’s company, as “the supplement brand that sponsors the show”. Its sixth says one nut covers a day’s needs and that too much causes hair loss. Medical News Today puts the adult upper limit at 400 mcg a day and one nut at 68 to 91 mcg, so five high-selenium nuts pass it. A peer-reviewed study found selenium varies between batches and lists fragile or lost hair among the signs of excess. The nut is cheap and sold everywhere; the authority sits with the person. The headline opens on her title, “Nutritionist”, and that credibility travels with her name to the brand that sponsors the show, whose site lists a “Hair, Skin & Nails” collection. A 2008 trial in 59 New Zealand adults gave two nuts a day for 12 weeks and measured selenium in their blood, not their hair. What the reader is asked to feel is a private worry, then relief with a name attached.
