Word Word File size increases A LOT after adding an image using image control.

I have an image control in my word form... when I load an image, lets say, about 300Kb, when I save the file... the file size increases to about 2Mb... Does any body know how can I fix this??? This is my code:

Private Sub OriginalImage_Click()
Dim FileName1 As String
DialogforOriginalImage1.Filter = "JPG Files|*.jpg|BMP Images|*.bmp|GIF Images|*.gif"
On Error Resume Next
DialogforOriginalImage1.ShowOpen
On Error Resume Next
DialogforOriginalImage1.CancelError = False
FileName1 = DialogforOriginalImage1.FileName
OriginalImage.PictureSizeMode = fmPictureSizeModeStretch
OriginalImage.Picture = LoadPicture(FileName1, 120, 160)
End Sub

Thanks in advance for your help!