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That is around 970 calories a day if you take 1/30th of each edible item on the Table.
It's not enough, but surprisingly almost half the needed amount.
If Poland is anything like the US, families were expected to keep a garden where they grew many vegetables and fruits, and often kept chickens.
Are you referring to 'Victory Gardens' in WWII?
If so, that's a bit of an apples to oranges comparison, since Poland had been at peace for over 35 years.
I'm Estonian, not Polish, but I've helped my mom grow potatoes and stuff. Because of the peasant history, our people have always grown our own food. Only in the least few decades has it been getting less common.
Prior to WWII, during the depression.
You supplement it with potatoes, carrots, cabbage, cucumbers and other veggies. And some apples and seasonal fruit.
Things sucked but people weren't malnourished back then.
Also not shown here: gasoline was also rationed, as were cars themselves.