Writer - Default Font

If I change fonts in a document, and then want to return to the default font, is there a keyboard shortcut that I can use?

Thank you.

The way back to the default font depends on how you made the changes:

Change made:
1 - Format > character or selected text, right click > Font or Character: You can select all the text you formatted in this way > right click > Clear direct formatting.
2 - Modifying the Default paragraph style or creating a new paragraph style or selecting a paragraph style different to Default Style: Just apply all you did in the reversed way.

Styles & Formatting are a very powerful functions. I recommend to have a look at the free guides which you can download from http://www.libreoffice.org/get-help/documentation/

short cuts: ctrl+z which is undo or after selecting the direct formatted text ctrl+m