The following is the description on the packaging of the famous product Jinluo ham sausage in a city. Please analyze and answer: Name: Jinluo ham sausage ingredients: lean meat, eggs, starch and white sand. (1) ham sausage is easy to deteriorate after its shelf life, so we should pay attention to the production date and shelf life on the packaging instructions from the perspective of safety;

(2) It is found that the ham sausage has been expanded in packaging, which indicates that there is bacterial reproduction, and the food is spoiled and cannot be used;

(3) The ham sausage is rich in meat, and the meat is rich in protein;

(4) Iodization in salt can effectively prevent goiter.

So the answers are:

(1) Date of production; ? Shelf life?

(2) no; ? Has deteriorated

(3) protein; ? Amino acid

(4) Endemic goiter (big neck disease)