I'm not very familiar with how government works in the US, and I've always had this question.

Like, if states are reasonably independent, and it seems like there are some states who lean way more into the socially liberal side of the spectrum from providing universal healthcare (or at least some better healthcare policies) on their own?

One of the stress points that seems increasingly correlated with modernity is a rise of obesity in many developed nations (most notably the United States, but also the United Kingdom, Canada, China, Mexico, and elsewhere). Japan instituted a fat tax that requires periodic weight measurements as a way to combat obesity. Denmark and India have taxed certain foods. New York City, while Michael Bloomberg was mayor, famously taxed soda as part of a policy package to address weight gains.

Meanwhile, groups have organized to attempt to reduce the amount of stigma associated with being fat, arguing that stigmatizing obesity and arguing for aggressive dietary change often creates runoff mental health issues among fat people, or worse that doctors' obsession with weight blinds them to other more serious health issues whose symptoms are being reported by fat patients.

This question is for everyone hailing from a nation dealing with some form of rise in obesity: What is the right balance to strike with public policy when it comes to dealing with the rise of obesity?