I eat 2 major meals a day, then snacks in between, each maybe 100-200 calories, depending on what I am in the mood for.
Like ^^^, if I am PMSing, it's 1 meal, all day long, i.e., "grazing" as DH puts it.
Calories? Not really sure anymore. I am on WW and was on about 1300-1400 per day (I think, it was 24 points), but found out that it wasn't enough, so I recently increased, so now I am really not sure.