You can achieve that trivially with such young kids by simply leading by example, not having snacks and junkfood at home and so on. We eat a lot of healthy stuf

You can achieve that trivially with such young kids by simply leading by example, not having snacks and junkfood at home and so on. We eat a lot of healthy stuff, so our kids do. You are still their world and define many patterns they will follow later subconsciously. That doesn't translate that much into say teens but it lays a solid foundation.