I found that I can eat protein (including steak) without much rise in my blood glucose. Whenever I have regular bread/potatoes/rice or pasta it raises my BG depending on how much I eat. I do monitor my carbs and since doing so have lowed my A1c from 7.3 to 6.2 without medications.
Diabetes means your Body can not control the rise of BG. What causes BG to rise... Carbohydrates Carbs raise BG ALL carbs Whole wheat, brown rice, most fruits, potato... all carbs raise BG
Steak has very few carbs so it wont effect your BG much, however the mashed potatoes will send BG through the roof.
Google "low carb hi fat diet" (LCHF) LOTS of diabetics can control there BG by eating LCHF diet without meds.