Comment by mulvya

Obese carriers shed lot more virus, so they would be expected to have higher attack rates.

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Exhaled aerosol increases with COVID-19 infection, age, and obesity

https://www.pnas.org/content/118/8/e2021830118

    In our observational cohort study of the exhaled breath particles of 194 healthy human subjects, and in our experimental infection study of eight nonhuman primates infected, by aerosol, with SARS-CoV-2, we found that exhaled aerosol particles vary between subjects by three orders of magnitude, with exhaled respiratory droplet number increasing with degree of COVID-19 infection and elevated BMI-years.