Things got so bad in Germany near the end of both world wars that sawdust was sometimes mixed in with flour to make bread. It was called ersatz bread.
Has Prime Minister Carney investigated that exciting food concept?
Now waiting for sawdust to be added to soy extract for foods with ersatz soy additives.
My former spouse grew up in Greece...where the civil war lasted to 1948
She told me about making flour from acorns....first grind them up and then soak in water a couple a couple of times to take the tannin out.
(Spouse passed away last year with a metastatic tumor.)
We were married 62 years.