Why does PDF file size increase each time I "save" tagging tasks?

Why does PDF file size increase each time I "save" tagging tasks?
Given:
1) I'm running Acrobat Pro 11.0.07 (this is most current version)
2) My file size starts at 750mb and ends up 15mb when finished tagging.
3) Only certain documents experience this increase, i.e., no visible pattern of document characteristics
4) PDF's are not full of images...in fact, mostly <H1> <H2> <H3> <P> <Figure> alt text, ect.
5) Occurs with text PDF's and/or fillable forms (again, does not happen to all documents...only some)
6) File increase occurs incrementally as tagging tasks are performed; i.e., each new save increases file size a few megabytes.
7) Occurs whether I "save" or "save as"
8) Difficult to optimize these files without corruption
9) I'm running Mac OS 10.9.4 (this is most current version)

Thank you so much for responding! I've been experimenting with the SAVE AS vs. SAVE for the past few days...and you are correct. It's funny because I've been tagging files for 2 years and never noticed this. Probably b/c I use both methods depending on the tagging tasks...some are more complicated than others and should not be overwritten. In those cases I SAVE AS new file.
I love this forum...thank you again!

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