Thoughts. Good job on the progress first of all.

Diet. You need some protein sources like eggs in there. It's all carbs and fruit (Fructose, more carbs). Don't skip lunch, tweak your breakfast smaller if you have to.

Workout routine. If you do it everyday, keep it up.
Why all the situps? And why 200 situps a session? What all those situps are going to do are give you sore abs, not visible abs. You need a workout that works most of your body, not one that is based on the misconception that situps give you visible abs.

You can try www.bodyrock.tv for a more balanced workout routine. A few ladies I know seem to like it. Then you might see some of the flabbiness come off.

I think instead of monitoring weight, use the mirror instead.
Keep at it until you like the person staring back at you.