If you eat too many oysters, the bad effects on your body are as follows: 1. The risk of increased blood pressure, because oysters are rich in sodium, and sodium can cause sodium retention, resulting in increased fluid in the body, which may cause an increase in blood pressure, resulting in an increased risk of hypertension; 2. If you eat too many oysters, it will cause the increase of uric acid in your body, which may lead to the high incidence of gout; 3, it will cause the excessive intake of protein, and the excretion of protein requires the participation of the kidneys, so if you eat too many oysters, it will cause the excessive intake of protein and increase the burden of the kidneys.