Don't eat this:

The hospital's consulting dietician was giving a lecture to several
community nurses from the Southampton area of Hampshire.

'The rubbish we put into our stomachs and consume should have killed most
of us sitting here, years ago. Red meat is terrible. Fizzy drinks attack
your stomach lining. Chinese food is loaded with msg. Vegetables can be
disastrous because of fertilisers and pesticides and none of us realises
the long-term damage being done by the rotten bacteria in our drinking
water. However, there is one food that is incredibly dangerous and we all
have, or will, eat it at some time in our lives.

Now, is anyone here able to tell me what food it is that causes the most
grief and suffering for years after eating it?'

A 65-year-old nursing sister sitting in the front row stood up and said,
'Wedding cake.'