Want to start your day healthy? Have some warm water when fresh lemon squeezed into it (and add a bit of ginger if you like), before you eat anything else. The internet is full of articles about this. I found this one which looked at it in an objective light and gives you the things it does and what is just a hype.
Dentists warn that lemon water can be bad for your teeth due to the acidity. If you are worried about this but still want the benefits – drink it through a straw, have it all in one go, or – just have warm water instead!