There are a ton of hypotheses as to why Americans suddenly started gaining so much weight in about 1980. Some are obviously silly, our genes haven't changed much since 1980 for example so most of the gain is environmental.
The New York Times had two good articles though on two of the more plausible ideas: We eat too much sugar, we sit too much.
If I was smart, I would put my computer at a desk I can't sit at.
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