sydnee,
The ADA folks and diabetic nutritionists are trained to say thise things about starches - what you should do is call back and ask them to send you a specific list of the vitamins, minerals, and fiber that you as a human require and that starches provide - my guess is that they will not be able to send you one. But if they do- go online and google the name of the nutrient and source
for example- Vitamin C, source
Then look to see if the ONLY source of the nutrient is a grain. I'd be willing to wager that you won't find even one. Otherwise it would be labeled as an essential carbohydrate and there are none.
As far as fiber goes- leafy greens and non-starchy vegetables are far better and far superior sources of fiber than grains- by the time you get to the grain, most of its beneficial fiber has been altered or stripped away. If you want fiber- eat your apples, and veggies with their skins attached.
I went to an ADA approved dietitian when I was first diagnosed- I have a PhD in protein biochemistry. I came prepared to discuss the essential amino acid, essential fatty acid, and vital nutrients and how I could obtain them as a vegetarian and still maintain blood sugar control- she looked at me like I was speaking in a foreign language- could not address even the most fundamental biochemical questions.
She had my meal prescription all figured out- but could not tell me what in those 8 starches per day was so vital that I would perish without it. What she handed me was a prescription for blood sugars far out of the normal, non-diabetic (70-100) range. (The ADA approves of A1c levels up to 7.0 - which equates to average sugar levels of around 170! far higher than your body was designed for). Sugar levels that would guarantee I'd need to increase my medicines until I would eventually need to take insulin injections, and eventually develop the dreaded complications of this disease.
I may still one day develop those complications, but it won't be because I kept my sugar levels outside of a normal physiological range. And it won't be because I refused to eat the high starch, low fat diet that made America fat, and diabetic- it'll be because it's hardwired into my genes.
If your goal is to achieve and maintain normal, non-diabetic sugar levels at all times, you won't find it in the ADA diet.
sandy