Young, thin people have an extremely low covid mortality rate. Young, obese people have a much higher morality rate.
>In a study of COVID-19 cases in patients aged 18 years and younger, having obesity was associated with a 3.07 times higher risk of hospitalization and a 1.42 times higher risk of severe illness (intensive care unit admission, invasive mechanical ventilation, or death) when hospitalized.
https://www.cdc.gov/obesity/data/obesity-and-covid-19.html
Look at a map that shows age and obesity, then overlay that map with the severity of Covid outcomes and you will see a very close correlation.