It's probably not from the seven syllable hyphenated names of the ingredients found in processed foods.
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I'm sure the Sanitary Ice Cream Cone Co. name comes from ice cream cone replacing the Penny lick glasses from the turn of the century...
It's just a company name designed to draw attention and make the consumer think they are getting something special. Examples are stores in the US and elsewhere named "Discount Tire" and "Cheap Tobacco", among others.
Also, Canada's Princess Auto was named after the street that the first store was on, not for attracting frogs.
It's more likely the ever increasing ability to better and more quickly diagnose disease, especially related to childhood health issues and not dying as children, as well as the improvements in the effectiveness of treatment and drugs. And not stepping in front of train and busses or falling off of tall buildings nearly as much... :D
"Sanitary" may have been the "fresh" of an earlier era.
Health of food processing methods depends on the process. Hydrogenating oils to create margarine with trans fats is an example of a bad food processing idea, especially as a supposed healthier alternative to butter. Canning was a brilliant food processing idea.
Pulling the endosperm out of wheat to create finer flour and then normalizing its everyday use was probably not our best move.
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Those life expectancy graphs have taken a downward turn in the past few years, but not because of food.
Cutting out teddy bear skins. New York. 1908.
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