No they don't affect our health. Where DID you get such an idea? Pressure Cooker gaskets are made of natural rubber, not plastics. read more
A gasket or sealing ring, made from either rubber or silicone, forms a gas-tight seal that does not allow air or steam to escape between the lid and pan.The gaskets in pressure cookers act as seals. A pressure cooker gasket is used to prevent the escape of steam through the gap between the lid and the bottom of the cooker during the cooking process. read more