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In one sense the fact that America is a well fed nation could be advantageous in case of climate change induced famine.

Being obese doesn't allow you to outlast starvation longer than a skinny person by more than maybe a few days.

It took me seconds to find credible information arguing against your assertion: "Using the model, we found that fatter individuals would indeed survive longer and, at a given body weight, females would survive longer than males, when totally starved"

A mathematical model of weight loss under total starvation: evidence against the thrifty-gene hypothesis

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3529354/

Well, considering that converting food into fat is a way to store and 'save' for later, that's not surprising, indeed.

Arguably, if that made no difference to survival our body would have evolved away from even storing fat long before modern times.

This isn't even arguing with what I said. I said at the point of starvation, being obese is only going to let you live for a few more days longer than a skinny person assuming you dont get any more food until death.

This paper is arguing that they are more likely to survive in general, which is obvious.

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