Fasting condition as dietary treatment of diabetes

A method of alleviating symptoms of, or treating, pancreatic beta-cell damage in a subject includes a step of identifying a subject having pancreatic beta-cell damage. Multiple cycles of a diet protocol are administered to the subject. The diet protocol includes administering of a fasting mimicking diet and a re-feeding diet where the fasting mimicking diet is provided for a first time period and the re-feeding diet is provided for a second time period.