Number - what does the number on the top left mean?

This is your live energy state, representing how much glucose is in your blood. It’s the number that draws the graph that is your Limbo line throughout the day.

As you lose weight, you’ll reduce your average energy state.

5.2 is the average for someone in the fasted state who is in average metabolic health. It comes from the WHO’s research on mean fasted glucose levels.