Please note that the data you link does not address obesity and health costs simultaneously! Obesity is indeed a contributing factor, around 5% of total.[ξ] And

Please note that the data you link does not address obesity and health costs simultaneously! Obesity is indeed a contributing factor, around 5% of total.[ξ] And from your references, the US has substantially more obeses and overweights per capita than the countries against which it is compared for health costs [ξ]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1449869/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1449869/