There’s can and should.
You can drink as much as you want, but you probably should drink, and eat, healthy.
You can watch as much TV as you want, in theory. But you should probably go outside more and enjoy the world and all it has to offer.
Can and should. The freedom to choose what you do. It’s both liberating and a curse. The state of your health and life in general can be broken down into lots and lots of tiny decisions adding up.
You can do whatever you want, but should you?