The incidence of diabetes can be reduced by up to 40% by providing continuous preventive advice over the phone to “reservists” who are at high risk for diabetes. Recently, a team of researchers from Kyoto Medical Center, a national hospital in Japan, published the results of this study in a British medical journal. After analyzing the study, the research team concluded that appropriate and friendly advice can increase the willingness of survey respondents to participate in prevention. The total annual medical cost of diabetes (in Japan) has now exceeded 1 trillion yen, and it is suggested that autonomous organizations should make flexible use of the telephone for diabetes prevention activities. The diabetes reserve army refers to people with high blood glucose levels or who are obese, and it is estimated that there are about 11 million people nationwide (in Japan). The team of Honorary President Eiji Katsutani of the Center began a study in 2007 with 2,600 diabetes reservists across the country, divided into two groups, with healthcare professionals regularly calling one group to provide prevention advice and the other group doing exercise and other activities on their own, and the study continued to follow them for five years. During the first year, the health workers called for 15-20 minutes at a time, encouraging the subjects if they were having trouble losing weight and considering together how they could make the exercise stick in the long run. Sometimes dietary advice was given, such as “eat more than 350 grams of vegetables a day”. Diabetes is a chronic disease, and most people have diabetes because of their lifestyle and eating habits. Surgery alone can be effective in lowering blood glucose and even freeing a diabetic from surgery. However, surgery alone is not enough for a long life. It also requires the cooperation of the patient to be effective and maintain. Telephone follow-up is a good option, as it can be more effective in helping patients improve their lifestyle habits through outside supervision. At the same time, it has been proven that a good post-surgery follow-up will enhance the quality of surgery and bring improvement to more people’s lives.