Diurectics make the body rid itself of fluid. So you will see weight loss but it is not real, there is not fat lost.
When you run you need more blood to function your body
If you are going off of the three meals a day I would say dinner, you can sustain proper energy all day then at night you can rest and regain energy that way.
BE nice to your self
you do you
Remember that everyone makes mistakes
Focus on what you can change