When my children have candy they often ask if they can keep the wrapper in their 'keepsake box'. While this sometimes frustrates me later when I find the wrapper abandoned in a corner of the room, it made me realise that they just want to remember how much they enjoyed the lollipop.
Instead of helping yourself to more, use this tip to help yourself stop overindulging: leave the wrapper on your work desk or kitchen counter instead of putting it straight in the trash - it will remind you that you already indulged today and may give you the will power to resist eating more!