Abstract
For sustainable society, it is important to realize food supply and demand system which is low environmental load. Previous studies about the system focused on only an aspect, for example lifestyle, economy or environmental aspect. In this study we aimed at both environmental load and lifestyle.
Firstly, we analyzed material flow on food supply-demand system by input output table. Then we estimated amount of food consumption, food loss, energy input to production of food and carbon dioxide emissions. As the result, this study found that approximately 50 million [t-CO2] carbon dioxide emissions in 2009. This is accounting for 4.5% of the total carbon dioxide emissions in Japan.
In the next, we investigated possibility of the food supply-demand system which reduce environmental load and meet the quantity of nutritive substances which need to intake each day. To estimate we used linear programming whose limiting condition were quantity of nutritive substances and objective function were minimization of environmental load. As the result, environmental load was minimized when the intake of Cereals, Potatoes, Beans, Meat and Dairy products increased, while Vegetables, Fruits and Seafood reduced. When all Japanese people realize this diet system, the reduction of carbon dioxide must be 5 million [t-CO2] per year in approximately.
