A famine food or poverty food is any inexpensive or readily available food used to nourish people in times of hunger and starvation
My area of Florida has multitudes of lichens. These things can get over 18" in diameter. When wet, they weigh a few pounds. When they dry out, they weigh about one ounce. Yet they look exactly the same, either way.
I tracked down a Lichen expert at a university who told me that it is called Deer Moss and that Native Americans used it as a subsistence food during times of famine.
(I couldn't insert the image for some reason? Only upload it as an attachment.)
Here's a link to the image:
https://www.backyardchickens.com/attachments/deermoss1-jpg.1639964/
The characterization of a foodstuff as "famine" or "poverty" food is primarily social. For example lobster and other crustaceans may be considered poverty food in some societies and luxury food in others depending on periods.
In the early days of Key West, they fed the lobsters to prisoners.
Gourmets had not yet discovered them.
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