For some reason Goths are stereotypically portrayed as fat. Robert Smith of the Cure who is typically considered to be the King of All Goths could well be to blame here.

The main reason why Goths become so fat is that they can't get outdoors to do some exercise as they are frightened that the sun will burn holes through the body, leaving them to melt alone in the sunshine like a morbid little snowman.

Goth's also tend to comfort eat to escape their inner feelings. Many consume sickening quantities of alcohol to try to escape the horrible little lives that they've created for thesmelves.