Consider:
- The US is much fatter, on average
- Medicare's standards for reimbursement are often not based on cost effectivenes
- The US government will pay around $150K/QALY vs. e.g. the UK's c. $40K/QALY.
More expensive healthcare per capita is what I'd expect given those attributes and "single payer is the only solution" does not seem to be logically linked to the problem and facts.
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
More expensive healthcare per capita is what I'd expect given those attributes and "single payer is the only solution" does not seem to be logically linked to the problem and facts.