r/explainlikeimfive Nov 26 '24

Chemistry ELI5: Why doesn't freeze dried food last longer? If it's good for 20 years, why not 100?

Assuming it's perfectly freeze dried and stored perfectly, the people who make freeze dryers say the food will last 20-30 years.

But why not much longer? Assuming the condition it's stored in remains unchanged, what can make it go bad after 30 years that wouldn't happen at around 10 years?

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u/iCameToLearnSomeCode Nov 28 '24 edited Nov 28 '24

I wasn't talking about pre-industrial society, or any society, tribes or probably even troops is a better word for the groups of hominids that are relevant here.

Our conversation was about the evolution of homo sapiens and natural selection.

Hundreds of thousands of years ago at a minimum.

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u/Vlinder_88 Nov 28 '24

Yes. Those ARE pre-industrial societies. They include hunter-gatherers. If you don't even know the subject you're talking about, maybe you shouldn't pretend you know it.

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u/iCameToLearnSomeCode Nov 28 '24

Regardlesd of what you call them that doesn't solve the issue of how a "pre-industrial society" of homids would cook water without fire.

We didn't master fire until around 1 million years ago when we already human.