Nutrition Report Net Calories?

Heya,

I thought I'd check out my nutrition report and my net calorie seems to hover around 950... I don't know what that means. I thought I was hovering around 1600 calories a day. I know I'm eating a bit lower than it says my total (~1800) should be when considering exercise, but I don't at all feel like I'm starving myself.

And while I'm at it... What's TTD? I don't even know if that's how it's written but I see it and others being thrown around and I don't know what people are talking about.

Thanks!