Occasional reflections on Life, the World, and Mathematics


The international community has responded to the shrinking of le Grand K by deciding to redefine the kilogram without reference to a standard artifact. As I pointed out here, the decision to preserve the kilogram at exactly the same mass squanders a rare opportunity for the metrologists to contribute to public health:

Just a 10% increase in the size of the kilogram  — easily achievable with current technology, and barely even noticeable to the casual observer — would produce a 9% reduction in BMI, and thus reduce the number of obese Britons and the attendant costs by more than half. This approach is found to be vastly cheaper than the next most cost effective plan for reducing obesity, a complicated scheme which involves citizens exercising more and eating less junk.

As I further point out, the international metrologists could learn from the UK Department of Education, which has been much more proactive in providing low-cost improvements through creative control of measurement.

On the other hand, as I’ve pointed out here, the benefits of reducing BMI may be overstated…

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