If you use a distro based on Ubuntu or Debian (like PopOS and others) I recommend Regolith Desktop. You can install it on an existing setup and it’s ready to go out of the box. You can choose it from the login screen like any other desktop environment like GNOME or KDE. The next version will also bring Sway/Wayland support since obviously X is on its way out in the long term.
Not to mention it’s around 800 mostly empty calories a day (at least based on the calories in the popcorn I eat). For me, that’s half the calories I need in a day to stay in deficit.