Finally, frozen food must have preservatives because it makes frozen food still fresh and stay longer. But, if you eat more preservatives would cause the body can not remove it out and become the residue and bring illness. According to the Ministry of health said, the consumption of preservatives in volume,less. But for a long time can cause chronic poisoning. In addition to the preservatives in frozen foods also has a component of sodium that can increase the risk of developing high blood pressure and heart disease. In the United State there is the check sodium intake should not exceed 2300 milligrams per day. For those aged over 40 years should be limited to no more than 1500 milligrams of sodium daily, as only one part of the frozen pizza contains 439 milligrams of sodium.