The medical profession is generally against witholding healthcare from people for sin/moral reasoning. Historically, this has been used to treat black people, gay people, single mothers, poor people, etc. with substandard care and does not lead to population-level good outcomes. Additionally, there is no way to access obese people with the medical processes they may need to lose the weight if the medical field is also systemically depriving them of basic medical care unless they lose weight.