This market will resolve to the best estimate of the US national obesity rate during the year 2030. (If necessary, I will pick the number from the earliest date during the year, although in practice it seems like there's usually one official estimate per year.) Note that this may require waiting until after 2030 to resolve the market as obesity rates are often only calculated for a given year 2-4 years after.

In terms of sources, I'll intend to use the "most official" source I can find. As of this writing, that seems to be the WHO's obesity statistics but I welcome recommendations for better sources.

In practice, I'm hoping this market can act like an "index" of sorts tracking expectations about obesity.