JPEG multiple editing. Is it destructive?

Hello... Could you help me please?
I'm testing Lightroom and I selected to "Include Develop settings in metadata inside JPEG, TIFF, and PSD files" and " Automatically write changes into XMP" (from catalog settings metadata options).
My question is :
Will JPEG image quality be deteriorated to any extent if I change (inside lightroom only) its developing settings (like, exposure, blacks, color saturation, croping..., ...) frequently?
Thats because I really do that several times.
Sorry for asking this but... Are you shure about your answer?
Lots of thanks in advance,
Miguel Garcia

If I understand the whole lightroom concept correctly, LR only records the "changes" to an image and leaves the original image file totally unaffected.
HOWEVER... Lets assume that you now want to do something with the image file with the LR adjustments. You will now need to export the original JPEG with all the recorded LR adjustments that have been saved in the XMP file to a ALL NEW JPEG file which WILL BE ALTERED.
The newly created JPEG will be an ALTERED JPEG with all the adjustments that you've made via LR. It would be the same as if you had pulled the jpeg file into Adobe Photoshop and done the alterations.
The IMPORTANT thing to remember is that UNTIL you've exported the starting image file to another format, ALL the modifications are like notes and are not really modifying the original file. If you pull up the image file in another software package, you will be seeing the UN-Modified image.
Hope this clears this up.
Lee

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