I have been eating reasonably well but every day would go just a little over my calorie limit. So I took sheet of paper and folded it in half length wise. I numbered 1-14 down the left margin and 15-28 down the right margin, for the days in February. Then I cut strips for each number to within an inch of the center.
Every day I stayed under 1500, I tore off the date strip. The days I went over, I wrote down the food(s) that put me over the edge. It has been so helpful to find out what foods I really can not eat while dieting.