I just started using fitday yesterday and I ate more calories today than yesterday. Does calorie intake matter? I gave my book to a friend about 6 months ago and have not gotten it back yet.

I have never counted calories with atkins but since fitday I see now how many I am eating....

And it shows that I burn almost 3000 calories a day. But where do they get that from.

Also when I go to list my foods they do not give you the option when you use a sugar substitute...
Can someone help me with this stuff?

Thanks Diana