Calorie calculators are not meant to give you your exact daily calorie expenditure, we're not robots. They are only estimates. Only tracking your weight loss for a few weeks will you get an accurate picture of your maintenance calories. When I started the calculator said my maintenance was 1,800 calories. After tracking my weight loss for a few weeks (and being very anal with daily food calorie calculations) I realized my maintenance was closer to 1,900-2,000 calories. That doesn't mean I throw out the use of calorie calculators. It was a great starting point. Without it I wouldn't know to start my maintenance calories at 1500 or 2000 or 2300 etc.

I understand what she's saying...some days I am hungrier than others. I don't know why. Maybe it's psychological. I think the weather has something to do with it, also how busy I am, my menstrual cycle, tons of stuff. Some days I eat 2500 calories and still feel hungry (or still feel like eating, rather). Other days I eat much less (1300 or so) and feel completely stuffed. I don't ever eat less than 1200 per day, which implies every day, but on occasional days I tally my calories at the end of the day and find that I'm under 1200, and still feel satisfied. Again, it's not often, but occasionally. I think that if you truly feel full, you should stop eating and not worry about it, as long as it's not a regular thing.

Satiety can be induced by too many factors to list.

What you eat, alone, can play a huge role.