Tax deduction for medicinal diet?

http://www.glutenfreespouse.com/tax-deductions-for-gluten-free-food/


<-- An interesting idea, actually. (Beware: slightly spammy looking web page, loaded with useless links, but sometimes you take the good with the bad.) 


The idea reminds me of the old (literally ancient) aphorism "Let your food be your medicine." I'm not a big fan of tax deductions per se, but as deductions go, medicine / equivalent seems like a better place to have them than (say) on expensive, exotic 3d cars for wealthy people.

(It reminds me, too, of  self-righteous calls to specially tax "unhealthy" foods, as if we know exactly what that means, with sufficient specificity that such a tax could be fair and sciency.)