The ideal range of blood glucose levels to stay within to lose weight. But the shape of your line is more important.
The zone is depicted by the green area on the graph in your app, and is the area in which your metabolism is functioning at its best.
The line represents your body's energy state which is the amount of glucose in your bloodstream. Don’t worry too much about the exact numbers – it is the shape of the line (keep it smooth!) and staying in the zone that are most important.