I'm not fussed what people put in their carts. If you want to eat shit food and feel tired and weak and get sick all the time, but you enjoyed your meal and weren't stressed about making it, good for you. It's all fine with me unless they turn around and start complaining about how awful they feel.
Likewise people being in crap jobs, or screwing around on their spouse and ruining their marriage, or doing bungee jumping and breaking their legs, whatever. Or maybe you're spending lots of time at work to get that promotion and your children barely recognise you and your life is turning into the last lines of "cats in the cradle".
Live your life however you like, just don't complain about it. As Yoda said, do or no do, there is no whine.