Impossible to say.  Depends upon what type of calories; 50% more can be
eaten on low carb than on high carb.  Also activity levels matter, and
thyroid, pituitary/adrenal function, insulin sensitivity, etc.

Metabolism is regulated by complex factors, and weight loss is not as
simple as calories in, calories out.

Susan

In article
<e2eab75f-9224-404a-89c5-746632ec6f23@h23g2000vbc.googlegroups.com>,

I'm not as knowledgeable as some around here, so I'll give it to you in
simple language.

http://www.ehow.com/how_2226702_lose-one-pound-per-week.html

How to Lose One Pound Per Week

by CCrock

Introduction
To lose a pound a week, you have to create a 3500 calorie deficit by
burning 500 calories a day more than you eat.
Instructions
Difficulty: Moderate
Things You'll Need
  €  pad
  €  pen
  €  calculator
  €  nutritional info on what you eat
  €  exercise plan
Steps
1
Step One
First, you need to determine your daily calorie intake needed to lose 1
lb. per week. Get out a pad of paper and a pen to work it out using the
steps below.
2
Step Two
Add a zero to your body weight Example: 160 + 0= 1600
Add 20% for extra daily activity + 300
Daily Caloric rate = 1900
3
Step Three
To lose 1 pound per week, Subtract 500 calories a day from your daily
caloric rate. You can subtract calories by eating 500 calories less or
by burning 500 calories through cardio exercise.

example: 1900 - 500 = 1400
4
Step Four
Of course, body type and fitness level are important factors to keep in
mind. The more overweight you are, the bigger calorie deficit you should
try to create, but don't go below 1200 calories a day.
Very fit people may need more calories to fuel their extra muscle,
perhaps by adding a little extra protein to each meal.

-----

And that may be where your friend gets into trouble because losing 2
lb/week would mean cutting back a 1,000 calories/day. Of course if she
stopped drinking a six-pack a day, she could lose her weight, but she  
would have to put up with reality;O)