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"[Science fiction] is the one literary medium left in which we have a free hand. We can do any damn thing we please."
- Alfred Bester

Concentro  
  Concentrated synthetic food rations.  

When gathering dusk made jumping too dangerous, we sought a comfortable spot beneath the trees and consumed part of our emergency rations. It was the first time I had tasted the stuff--a highly nutritive synthetic substance called "concentro," which was, however, a bit bitter and unpalatable. But as only a mouthful or so was needed, it did not matter.
From Armageddon: 2419 A.D., by Philip Frances Nowlan.
Published by Amazing Stories in 1928
Additional resources -

Human beings have always sought to produce concentrated food sources for traveling or hunting. However, this is a very early mention of the idea of a synthetic nutritional substance.

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Additional resources:
  More Ideas and Technology from Armageddon: 2419 A.D.
  More Ideas and Technology by Philip Frances Nowlan
  Tech news articles related to Armageddon: 2419 A.D.
  Tech news articles related to works by Philip Frances Nowlan

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