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As per Google: Prisoners of war in Asia during WW2 repeatedly | NEETprep.com - NCERT based NEET Preparation

As per Google:
Prisoners of war in Asia during WW2 repeatedly searched for cockroaches to eat as they were one of the only fresh sources of protein available. Praise be the cockroach. A 100-gram serving of cockroaches has 24 micrograms of diet B12 , almost 10 times the RDA.