I've wondered about this a lot, and I think it's genetic and optimized for survival in general.

Dogs barely set food aside; they prefer gorging, which is a good survival technique when your food spoils and can be stolen.

Bees, at the other end of the spectrum, spend their lives storing food (or "canning", if you will - storing prepared food).

We first evolved in areas that were storage-adverse (Africa), and more recently many of us moved to areas with winters (both good and needful storage). I think "finish your meal, you might not get one tomorrow" is our baseline survival instinct; "Winter is coming!" is an afterthought, and might be more nurture-based behavior than the other.

Yes, and it's barely been 100 years, probably closer to 50, since we have had enough technology to make the daily lives of most (or half the) humans in the world comfortable enough that they can safely take 1-2 days off every week.

For the first time in human history most people don't have to worry about famine, wars, disasters, or disease upending their lives; they can just wait it out in their homes.

Will that eventually translate to a more relaxed "instinct"?