For the main part obesity is a private health matter, not a public health manner, like the provision of fresh water, deep drainage, immunization, antibiotics ...
But, having said that, it behoves governments to protect the gullible, the vulnerable and the naïve from a junk food industry that's running amok - by restricting added sugar, restricting advertising and demanding junk food purveyors distribute their products in plain paper packaging.
People seem to be poorly educated about which foods fatten them up and which foods trim them down.
However, I doubt that any amount of education will ever compete with the addictive power of fat and sugar.
Plus when you can gain 2,000 Calories from bread, butter, peanut butter and honey from around $5, what hope is there of poor people eating well?
In the meantime stay tuned highly tuned and eat from the top of the Hourglass.