I think the air conditioning thing is a little bit far-fetched. The reason why we are fat is because people eat out more often than they ever have these days. When we eat out, the portion sizes are much larger than what we should be eating. Haven't you ever noticed at a sit-down restaurant they give you enough food for 2 or 3 people?
You have to also consider that we are not as active as we should be. People drive everywhere. Our entertainment consists of television, the internet, and other things that don't allow any form of exercise.
To further disprove your point, I have never lived in a house with air conditioning and I could stand to lose a few pounds.
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