Like all forms of seafood, you risk the potential to get sick from consuming it. Many factors come into play for how to safely and healthily prepare and eat seafood. Some people get sick from overeating seafood or fried food.  Because oysters basically filter the water around them and clean the sea of impurities, that poses a risk if the water has been heavily polluted. You also may need to make sure you cook your seafood well and to the proper temperature. Steaming oysters helps to kill harmful bacteria. Those who choose to eat raw oysters should do so with caution. Many enjoy raw oysters, whole or chewed, with complementing sauces and seasonings, but illness is possible.