One week, even with discipline, you might only drop 500 calories a day.
3500 calories is what is required to drop a pound of weight.
This can EASILY be masked by water retention when you weighed yourself.
But alternatively, this can also easily be held back by excess calories from the time you wake up to 7 pm.
It can also be the quirks of most scales. You'd be surprised how inaccurate scales can be.
The mantra: If you really have made changes in your eating and exercise programs, you are dealing with a temporary roadblock. But it may not be temporary. There may be compensating dietary behaviours involved. I would be more than willing to go over them with you.
I would need to know:
1) Your weekly exercise regimen (like, over the last 2-3 weeks)
2) Your diet regimen (unfortunately, as anal as it may sound, it has to be specific)
3) Secondary information: When do you weigh yourself...when did you weigh yourself initially...where have you been weighing yourself...have you incorporated more liquids (esp. water) into your diet?...have you been sedentary the last 6 months or have you been active...if so, describe that activity?
Really, answers are only possible if people know your habits and patterns.
Michael