Throw away food containing meat, poultry, fish, eggs or milk if it sits out at room temperature more than 2 hours. This includes icing made with whipped cream or eggs and cream pies such as pumpkin and pecan. Heating Leftovers Heat leftovers until hot all the way through, not just warm. Bring sauces, gravies, and soups to a boil. Never taste old leftovers to find out if they are safe.
Spoiled food can taste, smell, and look okay.