He should follow a strict heart- and diabetes-friendly diet with low salt, low sugar, and low saturated fat, and avoid fried and processed foods, while consuming more vegetables, whole grains, pulses, and lean protein in small, frequent meals. Good blood sugar control before surgery is important, and his cardiologist may adjust insulin and assess heart function to optimise fitness for CABG. After one month, if sugars and overall condition are stable, he will likely undergo preoperative assessment and then CABG as planned, with close heart monitoring due to the low ejection fraction. The approximate cost of CABG in India varies widely, typically around 2 to 7 lakh rupees, depending on hospital type and complexity of the case.