after finishing a marriage party we reached home and in the night my 12yrs daughter suffered from vomiting and diarrohea, within two hours my wife also started vomiting and she also had diarrohea, latter it was my turn, we had to get admitted in a local hospital, most of the people who ate in the marriage also had suffered this gastric upset, doctors said it is food poisoning, what is this food poisoning? is there any poison added in the food?