Wedding cake?

A diet guru is holding a seminar in the conference room of a large hotel. “The food we eat,” he explains, “is slowly killing us. 

Red meats attack the heart. Vegetables and fruits are sprayed with harmful pesticides. Even our drinking water is polluted! But do you know which food is much more dangerous than them all? Can anyone tell me what it is?”

A man in the back of the room raises his hand and, when called on, answers, “Wedding cake?”