Hi,
My idea is to create a "check" or "end" button for each day. Like you are finished for the day og press check to have a summery of how the day went, the balance between food and exercise. I think this also would help against the crawings that sneeks up as the evening comes, how bad would it feel to "open" up the day again just for a little snack. It would also give a closer update when its given day by day.