It is easy to make jokes about the Eastern European and Jewish prerogative about food. It is not so easy when you know both groups have been literally starved to death through no fault of their own.
It is easy for someone to say "why didn't they just leave" but not so easy knowing because these murders by starvation were intentional, the victims were actively prevented from leaving. Which in itself is proof it was intentional for these people to starve to death.
If you want us to believe something like the Holodomor was a natural famine you shouldn't also tell us about internal passports (something many countries have done in order to keep an eye on where their "undesirables" are going) and people being shot for trying to board trains, planes, busses, and carriages. If, instead, it was natural, why stop people from going somewhere that there IS food?
Through the lens of epigenetics we can begin to understand why a third generation American of EE/Jewish descent might have this anxiety about food, about making sure there is enough, that we remember those who are less fortunate, that we appear to subsist entirely on leftovers. Or, indeed, why many with these epigenetic changes tend to trend towards higher percentages of body fat. Our bodies through our genes remember a time nobody could be even a pound overweight and it knows that the body literally eats itself as we starve and the first to go of course is body fat so our bodies, knowing all this, make sure we have extra "God forbid (ptoo ptoo ptoo), just in case".
"They tried to kill us, they failed, let's eat" isn't just a pithy saying. We outlived them even despite being unable to eat. We do not hoard food, we just happen to have a lot of leftovers through this anxiety about food. "Oy, I ate too much" is a blessing. With it, we are aware of how few times our ancestors could say the same. During Pesach (Passover), we have an entire dinner party (complete with perhaps a little too much wine) and recline in style as we eat matzo and remember why it is just so damn flat (we rushed off to escape from Egypt without finishing making our dough. D'oh!). Everything on the seder plate has a meaning, with some items being added or removed based on the traditions of the family or congregation doing the seder. Such as in the past couple years the olive is added to symbolize the hope for peace in Ukraine (or, for some, peace in the Middle East). Or the orange to symbolize the inclusion of the LGBTQ community.
Perhaps it seems paradoxical to eat so much in one sitting instead of saving some for a time where food may be scarce. But it goes hand in hand with "They tried to kill us, they failed". We have survived another day and have enjoyed good food and good company. In spite of everything they did to us. We feast out of spite. Perhaps because of all those times our enemies were eating without a care in the world while our ancestors watched and starved. We have proof of commie buffets while starving Ukrainians watched from the street. We have proof of Jews being teased with food, with Gentiles tossing heels of bread on the ground so they could watch as said Jews fought over it or flinging a sausage and laughing as Jews raced to get it as if they were playing fetch with a dog. Or the innumerable times people were killed for stealing a handful of grain when many times they were the ones who had farmed the grain in the first damn place.
There are many who do not see starvation as a tool of genocide. They don't understand how starvation can break a community. Death by Hunger, the translation of Holodomor, was not about control like people claim (in other words they claim the death was an accident, that the starving was meant to keep people in line. If they had just behaved themselves they wouldn't have died etc.,). It was always and forever about a stronger group ridding the world of another group without getting literal and metaphorical blood on their hands. They could cite plausible deniability. It wasn't their fault, honest, it was just bad luck.
The stereotypical scene of people in lines that stretch multiple city blocks was in fact the norm. And more often than not, only the first few dozen would get anything at all and everyone else would find they had wasted an entire day waiting for food that was never meant to be given to them in the first place. The supply was purposely small. At least for those who were either too low in the Party or not a part of it at all. For Jews, you turned to the black market which was often caught selling spoiled food as well as food that wasn't actually food at all (such as sawdust masquerading as bread). Which happened even with regular stores because as a Jew you could only buy certain things and everyone knew it and still would not sell the genuine article because why should they? It is, after all, going to a Jew. Soviet areas were guilty of doing this to everyone, too.
So if you are visiting an EE and/or Jewish home and they actively push food on you and insist you take leftovers, that is their love language. We want you to have enough because far too many times our people did not. And in Jewish culture, it is a literal mitzvah to provide food to those who cannot procure it themselves either because of money/access, or they are going thru the bereavement process or otherwise incapable of dealing with making sure they have something to eat (such as an illness that prompts them being added to the Mi Shebeirach list which in many congregations is printed and given out to refer to during the Mi Shebeirach prayer during services and may also be paired with the mourner's kaddish list). It is why when you go to a house where the occupants are sitting Shiva, you will often find their kitchen stacked with tupperware of varying sizes and cuisine and you will often be instructed to bring something as well though it isn't a requirement. Generally, your presence is considered the more important aspect of the Jewish bereavement process. (Just do not say you are going to sit Shiva with someone. Rather, you are paying a Shiva call or condolence call. Only the mourners are in fact sitting Shiva. Also important: try the door first before ringing or knocking, as usually that is seen as an interruption to sitting Shiva which is frowned upon. And do not literally call them unless told otherwise for the same reason.)
Food makes or breaks us. Food is not inherently moral or immoral. And yes, perhaps there is always room for dessert. And maybe we do eat too much but that's okay. We have survived to enjoy it, so let us do so. Nu, it is what our ancestors would want.