What is the way to recovery from Diabetes Mellitus?

robinchakravorty asked:

My brother has been just detected having Diabetes Mellitus with blood-sugar 281 after fasting and a triglyceride level of 544.I solicit Expert recommendation regarding total recovery from this disease.What foods to be taken,what foods to be avoided,at what intervals food should be taken,what should be the way of life,why a person gets this disease,how it can be avoided altogether?Our maternal grandfather had this and our mother aged 86 years also has it.