Yes, whey protein is safe to consume for diabetic patients as long as they maintain healthy weight. According to a study published in the World Journal of Diabetes in 2015, whey protein may be beneficial for managing diabetes. It can delay gastric emptying, increase insulin and gut hormones, and lower post-meal blood glucose levels, especially when consumed prior to a meal. However, it is wise to consult your doctor before opting for a protein supplement if there are any secondary medical conditions like kidney disorders, gout, or high uric acid levels.