Calories in- Calories out!

I have had quite a time these last few weeks losing weight or lack thereof.

You would think as long as I have done this I would just know things. WRONG
For instance... the more you work out, the more you need to eat.
I have always heard this I guess, but I seriously could not wrap my head around it..
nor did I want too.
Now after to talking to a few gals..
Im talking about gals in a position to tell me why this is a must!!
I have decided that this week I will experiment and eat more when Im working out.
Im using http://www.myfitnesspal.com/ to log my food and my workouts.
As I log my exercise, it bumps up my calories.. telling me what I need to eat.
Makes it so easy for me to know how many I need to be eating.
Yet, I find it harder than heck to get more in. But I will!!!

On a normal day I should be eating 1640... thats with no exercise.
With exercise... I should be getting between 1900-2100
Depending on the intensity of my workouts.
so here it goes people!!
A full week of dedication to the calories!!!
Who would have ever thought I would be told to eat more!