All foods eventually become sugar in your bloodstream, but it takes longer for different types.
Basically: Refined carbs (candy, white bread) > whole carbs (whole wheat and grains) > fat > protein.
This is why experts recommend whole grains over white rice, bread, etc., because the sugar enters your blood stream over a drawn out period of time. That is why if your weight loss plateaus, I recommend upping your fat/protein, because you necessarily lower your carb intake and it becomes easier to regulate your blood sugar. I also mention keeping sodium down, because foods high in fat and protein are usually high in sodium, which causes water retention and will mask any weight loss.
Pretty good advice, I'm very much in the anti whole grain camp though based on what I've read. But appreciate there are those who have a differing opinion on grains. Or rather specifically dwarf wheat.