A doctor is addressing an audience.

"The material that we put into our stomachs is enough to have killed us years ago. Red meat is awful. Soft drinks corrode our stomach lining. Chinese food is loaded with MSG. High fat diets can be disasterous and none of realise the long-term harm caused by the germs in our drinking water....but there is one thing we eat that has a long term and disasterous effect on our lives. This one food alone...and most of us have or will eat it sometime in our lives....can cause grief and suffering for years after eating it. Can anyone here tell me what it is?"

After several seconds of silence, an old chap in the front row raised his hand and softly said...

"Wedding Cake".