As an experiment, one morning you could have a fry up consisting of bacon, egg, mushroom, tomato, No bread / grain products, potatoes or sausages (sausages contain wheat). Record blood sugar levels before and two hours after, label findings Dr Death.
The next morning have a bowl of your usual cereal, doesn't matter which one. Again, record sugar levels before and two hours after. Label Dr Best.
Now compare Dr Death with Dr Best, which breakfast spiked your glucose levels?