I can't remember where I read this article but it stated that we are heavier today because there are air conditioners everywhere. We no longer sweat a few pounds off during the summer because we have controlled, cool climates. I don't think we'd lose 15 pounds if we were air conditioner-less but I'm sure it adds up.
If anyone can find an article on this subject or something similar, add a comment with a link to its location.
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