This research focuses on Eco-cooking, an environmentally-friendly way of cooking through shopping, cooking and cleaning. We analyze and quantify people's energy-saving behaviors, evaluate the effect of eco-cooking, and seek to clarify what kinds of energy-saving behaviors have or have not been promoted by energy-saving education. The three-year-research on third-year students in home economics teacher-training program shows reduction in gas, water usage and waste produced during cooking by 40％ to 80％. CO₂ emission amount also decreased by about 50％. Furthermore, survey shows people who sometimes or always perform energy-saving behaviors account for 75％ of the total. In conclusion, Eco-cooking energy-saving education is generally effective in raising people's energy-saving awareness and inducing behavior change. In order to make limited energy-saving educational programs more effective, it is important to ponder upon the content that is suitable for such a program as well as what the program should focus on.