a) Fresh and perishable vegetables and fruits: This type of food has both problems of food safety due
to chemical residue during production and of cargo damage during transportation. b) Animal and water
products (meats, dairy products and fishery products): With the improvement of livelihood, the average
consumption animal and water products goes up quickly, and their production expands quickly
accordingly. Due to blind pursuit for output growth, large amounts of prohibited growth hormone, animal
and fishery medicines are applied in production. The results are, fast increase of output on the one hand,
and decline of food quality and over-residue of medicals and hormone in the products. c) Processing food
products: The process of food processing has pollution both to the environment and to the food products
themselves. The reason of pollution is mainly that, most of the food processing factories are too small to
satisfy food safety conditions, so that the products are easily to be secondarily polluted during processing.
Some producers use illegal additives to improve the appearance quality.