Was the Mona Lisa Fat?

In December 2010 Silvano Vinceti reported that the Mona Lisa appears to have tiny letters and numbers in her eyes which are only apparent when viewed with a magnifying glass and shortly afterwards said that the model was Leonardo's male apprentice Gian Giacomo Caprotti (known as Salaì) and that the letters were clues to his identity. The Louvre, pointing out that he had had no access to the actual painting, said that after "every laboratory test possible" in 2004 and 2009 that "no inscriptions, letters or numbers, were discovered during the tests." and that the "ageing of the painting on wood has caused a great number of cracks to appear in the paint, which have caused a number of shapes to appear that have often been subject to over-interpretation"

Answers on a postcard please.