While the New Scientist article effectively calls out the aesthetic takeover of fancy sea salts and pink Himalayan crystals that have pushed drab iodized table salt off supermarket shelves, it stops short of quantifying the accelerating public health consequences and the specific populations now at greatest risk. The piece correctly recounts the history—Switzerland's 1922 iodization program and Michigan's 1924 effort that virtually eliminated goiter and delivered measurable IQ gains, as documented in economist Dimitra Politi's later analyses of schooling data—but underplays how current dietary patterns are undoing those gains in high-income countries.

Synthesizing the New Scientist report with two peer-reviewed sources reveals a clearer pattern. A 2021 systematic review in The Lancet Diabetes & Endocrinology (methodology: pooled analysis of 23 national surveys conducted 2010–2020 covering more than one million participants; limitations: heterogeneous urine-sampling protocols and limited data from certain regions, though peer-reviewed and not a preprint) concluded that inadequate iodine intake still affects roughly two-thirds of the global population, with a notable uptick in deficiency signals among pregnant women in Europe and North America. A separate 2022 cross-sectional study in the British Journal of Nutrition (n=1,124 UK women of reproductive age; methodology: spot urinary iodine concentration measurements paired with dietary recalls; limitations: single-spot urine tests can vary day-to-day and the sample skewed toward higher socioeconomic groups) found 42% of participants below WHO sufficiency thresholds, with vegans and those avoiding dairy showing the lowest levels.

These data connect dots the original coverage missed. The rise of wellness-driven 'clean' eating has reframed fortification as suspicious additives, mirroring anti-fluoride campaigns. At the same time, reduced cow's milk consumption—replaced by unfortified plant milks—and increased reliance on processed foods made with non-iodized salt for manufacturing compatibility have removed two major dietary sources. This convergence hits populations that need iodine most: pregnant women (whose requirements rise 50%) and young children whose brains are still developing. Even mild-to-moderate in-utero deficiency, per the cited Lancet review, is associated with 0.3–13 IQ-point reductions at the individual level; scaled across populations this implies measurable drags on educational attainment and lifetime earnings.

The original article ends abruptly on an unpublished study and wonders if benefits will be undone. Evidence suggests they already are being undone in pockets of affluent societies that ironically view themselves as health-conscious. Economic models building on Politi's Swiss work estimate that every dollar spent on iodization returns $30–$50 through cognitive gains; we risk forfeiting that multiplier by treating pink salt as morally superior. Public-health agencies have been slow to counter influencer culture with updated messaging or expanded fortification (e.g., in bread or plant milks). Without visible goiters, the problem remains invisible—yet urinary iodine surveillance programs continue to flash warning signs. Addressing this underreported risk demands reframing iodized salt not as 'boring' but as an evidence-based tool that lifted national IQs, while educating consumers that 'natural' does not always equal optimal.