Save metadata in LR - degrade JPEG image quality?

Hi:
Does anyone know whether using the 'save metadata' feature in LR to save changed metadata to a JPEG file will result in a resaving of the entire file and/or otherwise degrade the JPEG image quality? 
If it does not degrade the image quality, how does this feature work?
Many thanks for the help

Each pixel remains unchanged in this process.
I was under the impression that any re-saving of a jpeg image results in a slight loss of quality, regardless of whether there have been changes to the image
This is true for other editors, such as Photoshop or Photoshop Elements, but it is not true for Lightroom because, as explained, LR does things differently than other software.

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