I wouldn’t eat quinoa, as a substitute for potatoes, rice or pasta, it is way too carby for me. However the best way to see if you can tolerate it yourself is to test your blood sugar before and after eating some.
I've heard of Testing to Destruction, but that is usually done by design. I pesonally use grated cauliflower for my rice substitute. For spaghetti I use Black Bean or Soy spaghetti - usable but obviously not the same taste. Ditto Konjac products.
My experiment with quinoa showed it spiked me as much as rice.
I agree with Oldavtr that Quinoa is too carby for me. I use grated cauliflower as a rice substitute if I feel I want the rice texture, but otherwise (in Indian or Chinese restaurants) I just order a side dish of a green veg such as PakChoi or Saag.
Most of the soluble starches will be released into the water during cooking. However, there is a form of starch in a class labelled RS3 that are resistant to digestion processes and do not contribute to the glucose levels
According to Wkipedia
"RS3- Resistant starch that is formed when starch-containing foods (e.g. rice, potatoes) are cooked and cooled, such as pasta. Occurs due to retrogradation which refers to the collective processes of dissolved starch becoming less soluble after being heated and dissolved in water and then cooled."
Note that it is the dissolved starches that make pasta and rice swell.