Not appetizing but factual undisclosed reason. They threw nothing out. A few brown specs in the flour does not make that flour inedible. In fact it adds protein. When it comes to filling the belly to survive they were not too picky.
Meat was hung without refrigeration, and they just carved off the moldy rotten “rind” to get into better slices without the mold. Moldy dry aging was popular because they had no choice. Like Dry salami. They were tough in those days, they did not live in a perfect little sanitary bubble of politically correctness.
“I’m not eating that” was a totally unknown phrase. They ate everything they could get and threw none of it away, just cooked it again and added more to it. The 24-7 stew pot with weevil biscuits was a real thing, and common...
And if the SHTF better get used to it, it will be the new lifestyle for those who will survive. :)
But you did not sift flour to crush weevils. That is so far out in left field that it is not even in the ball park.
And many of your "tough guys" died of dysentery.
Which is quite unpleasant.