The camera adds 10lbs fact or fiction

Hello my lovelys so we have all heard the saying that the camera adds 10lbs
But is it the truth or just an old wives tale? And if it is true then how does the camera add 10lbs? I'm looking forward to reading all your answers and theories xxx

maybe its because the image is 2D? Spreads it out abit more?

Im no stephen hawking as you can tell....
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I dont really believe this is true I think i look slimmer in pics that in real life lol..!!

xx

Just found this answer on wiki answers but as it is wiki don't take it as 100% correct:

Usually, it is an optical illusion caused by straight-on lighting coming from the photographer's position (the most common use). A photograph is a 2 dimensional representation of a 3 dimensional subject, and this type of light has a tendency to "flatten" the subject and reduce the illusion of depth. However, the apparent width does not change, tending to make the subject look bulkier.
There is also a psychological aspect that may come into play at the same time. Even though we may occasionally view ourselves in a mirror (which appears 3-D), we may appear less flattering in the moment a picture is taken because we are more critical of the entire 2 dimensional image of us.

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guess so and proper photographers can use light to create definition to parts of our bodies mask flaws and even use tricks to hide wrinkles and stuff very clever really xxxx