I suspect that regular check-ups for most people would simply regularly confirm what they already know: they need to lose weight, stop smoking, take more exercise, eat more fruit and veg.

The UK now has a sugar tax on soft drinks that seems to be having a measurable positive effect. Whether it is a meaningful effect remains to be seen though:

"The findings suggest that a year after the sugar tax was introduced, adults reduced their daily free sugar intake by about 10.9g, and a reduction in soft drinks accounted for over half of this reduction. This translates to a reduction of around 40 calories daily, which if maintained, and assuming no other changes, could lead to 1.5kg weight loss over a year."

https://theconversation.com/how-do-we-know-the-uks-sugar-tax...

So perhaps instead of exhorting people to do better the state should continue to try to make bad habits more expensive and good habits cheaper.