What is the proper diet for diabetic person with rheumatism?

No sugar, low carb. Diabetes is a disease of sugar and carbohydrates. You need to limit them at all costs. Insulin, the storage hormone of sugar and carbs, in excess causes inflammation and most preventable disease in this country: heart disease, high blood pressure and the most common cancers (breast, colon, prostate). Rheumatism is a disease of inflammation as well, both dm and RA are linked and related to diet.