My cat was recently diagnosed with diabetes. He has high sugar levels in his urine and a fructosamine level of 570. I'm currently giving him Lantus insulin injections twice a day. Since Barsik is prone to sand formation, and we've already treated him with a special urinary tract diet, could these factors have triggered the diabetes? The urinary tract diet isn't very good in terms of nutrition, as meat is far from the top ingredient.