When a large portion of healthcare costs are public - then you might want to ban things with huge negative externalities in the form of future healthcare costs...
It's a little unfair to eat your cake and have the public pay for it later...
https://pubmed.ncbi.nlm.nih.gov/18254654/ "Because of differences in life expectancy, however, lifetime health expenditure was highest among healthy-living people and lowest for smokers. Obese individuals held an intermediate position."
"Although effective obesity prevention leads to a decrease in costs of obesity-related diseases, this decrease is offset by cost increases due to diseases unrelated to obesity in life-years gained. Obesity prevention may be an important and cost-effective way of improving public health, but it is not a cure for increasing health expenditures. "
The linked article was published in PLoS Medicine, a high impact-factor journal.
0) Dying fast is clearly not an objective - if it was... Why ask people to eat unhealthy things instead of just killing them directly?
1) If you die at 17 - you never pay taxes. Dying fast != cost effective.
2) Unhealthy people that die at 17 can still have more healthcare costs than healthy people that live to 109. Age of death has little to do with healthcare costs.