Why photos in iPhoto (mac) have a different size (mb) than the original?

I have noticed that some photos (not all) have a smaller size (in MB) in iPhoto than the original ones. Do you know the reasons of such decrease of size? iPhoto import procedure is supposed to not lose any information wrt the orignal one then, why the imported photos in some cases should be smaller? Thanks in advance.

1. the source of the original size is the size that I read in the finder (not the one read in the camera).
2. the pictures are jpg
3. the source of the anomalous size is the info box of iphoto, the box where you can find all the exif info, resolution, iso, f-number, EV, etc. In this box you can read also the size of the photo, and here I find that for some photos a smaller size than the original one read in the finder. 
4. for the records the camera is a FUJI S5 pro.
5. the photos are not edited in iphoto, as said in my reply, just imported and placed in a album. I just import photos in a folder on my mac, import those photos in iphoto, and I find the mismatch of the size between the photos in the folder on my desktop with the original photos and the ones in iphoto. As said, this does not happen for all photos, but for a subset, which appears to be random, since I do not find common features in these photos. I have check in older photos imported and find similar mismatch.
I know that's crazy, I really do not understand why this strange fact is happening. It is even stranger, that if I import twice the same photo, I read two different size in iphoto.

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