Actually, there are urine tests that will help with determining diet. Keto Stix will tell you if there are ketones in your urine and determine if you are on a low carb diet. Ketones are the preferred fuel for your brain. And the Keto Diastix will help to determine sugars for diabetics. These tests do show a range, but not a specific number. Anyone on a low carb diet can show ketones in their urine--not just diabetics.