Is this even possible?, My weight loss

I couldn't resist temptation, and jumped on the scale first thing this morning, and I am down 4 pounds from a week ago.
But, is this even really possible? maybe my scale needs new batteries.
I have been working hard at my diet, and really haven't cheated at all. I have just been eating around 1100 calories a day, and choosing the calories I DO eat wisely. I haven't even been working out, but I did work hard all weekend, basically spending 9-12 hours in constant motion with walking and patient care. I also started taking the stairs. (2 of my 4 shifts I had patients on both the 2nd and 6th floors. ) Is it possible to loose 4 pounds in a week this way?

Yes but it is likely water weight - ifyou are slugging back the water like crazy then yes you will lose that - but that is the initial loss - now you will see a bit less, about 2 pounds per week from now on - but good job girl!

Congrats Tara and yes just like Jen said you can lose that much in your first week of really following a program and it should taper off as the weeks go by. Keep up the great work and you will be back to your goal in no time.

Well, I haven't been drinking anything. Really, at all. This weekend, I realized that I had gone 18 hours with out drinking anything but 12 ounces of coke. Working nights really screws with you, esp. when you are busy. I also went 24 hours and only ate one thing of yogurt, 1/2 a serving of malt o meal, and a hand full of baked french fries. (not by choice, I was stressed, having a panic attack, and busy at work)

Ugh. Not pleasant.

I'm getting back on track, eating to keep my metabolism up, and drinking lots of water today.

Definately possible - I remember when I first started my diet about a year and a half ago I lost 7 lbs the first week - the first thing I did was jump on here and ask is that possible?

On another note, 1100 calories is very low - most experts recommend no less than 1200. Just a thought.

I'm not really succeeding at 1100 anyway. I'm trying hard tho. I found a website called thedailyplate.com, where you put in your weight and activity level and how fast you want to loose, and they tell you how many calories you can eat and help track your calories. It is pretty neat. My goal was to loose 2 pounds a week.