Alternatives to artificial sweeteners, and white sugar?

My dad has stage 3 lung cancer, emphysema, and pulmonary fibrosis. He likes to drink coffee for breakfast, as well as after lunch, and after dinner. The problem is that he's a diabetic and uses artificial sweeteners that are obviously contain aspartame.

Does anyone here know if he can substitute raw organic honey, or Sugar coconut, or unbleached grinned stevia leaves? Tweet