We all know — because we are being constantly reminded — that we are, collectively, getting fat.  Americans are at the forefront of the trend, but it is a transnational one. Apparently, it is also transspecies: pets, wild animals, and laboratory animals are also gaining weight.  Here’s some country-level data from the New York Times:

Screenshot_1In an excellent review of the existing literature, David Berreby at Aeon skewers the idea that a simple, victim-blaming “calories in, calories out” model can explain this extraordinary transnational, transspecies rise in overweight and obese individuals.  I won’t summarize his argument here, except to simply list the casual contenders for which there is good evidence:

  • Sleeplessness
  • Stress
  • Viruses
  • Bacteria
  • Industrial chemicals
  • Heavy metals
  • Electric lights
  • Air conditioning
  • Famine in previous generations

If you ever want to have an opinion on fat again, read Berreby now.

Lisa Wade is a professor of sociology at Occidental College and the co-author of Gender: Ideas, Interactions, Institutions. You can follow her on Twitter and Facebook.
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