How much food can be saved for the country if the people of the whole country only drink water and don't eat metal plates a day?

China has a population of1400 million, and the food consumed every day is astronomical. Cereals include rice, flour and other staple foods. Generally speaking, a normal person consumes about 2 Liang of food for breakfast, 4 Liang for lunch and 4 Liang for dinner, which is about 1 kg of food a day. If so, the country consumes 65.438+0.4 billion Jin of grain a day.