diabetes now is a common problem for all people. especially for the old. and then what factors cause this disease are becoming the main concerning for human beings. the followings are some factors that cause diabetes. 1.dietary problem some people like to eat sugar very much. sugar can lead to obesity for us and obesity is also a factor that cause diabetes. 2. no exercise as the development of technologies, people do not need to walk. we have cars, buses and other convenient transportation. 3. bad mood I hope these are helpful.