So an average calorie count for a piece of supermarket steak seems to be 700 calories, with zero carbs according to the label. Whereas "Fresh Cornish Sardine Fillets" 180gm is 507 calories and practically zero carbs. Because they are high in calories they will increase BS. Even though they have no carbs. So why have I been following a very low carb diet for all these years. Should it be a very low calories diet regardless of carb content? Still confused.
No Geoff, Hi Calories is not equal to increases in blood glucose levels. If you were to eat butter (I know, yeuch) you would see next to no increase in blood glucose levels, but eat very many calories. This is due to the processes that convert fat to carbs taking a long time, and also because fat absorption takes a long time.
Protein is slightly different. Again it's not the calories that matter, and as a T1, protein tends to have more of an effect than as a T2 - if you eat a normal amount of protein per meal (i.e. less than 30g) then it will have very little impact on your blood glucose levels.
The thing that will affect your blood glucose the most is carbs, and it is these that you should pay most attention to.
I'll say again though, that statement is rather misleading.