Let's see...How do we lose weight? To lose one pound of fat you have to expend 3500 calories. You can do that by either exercising or by consuming less calories. But the bottom line is 3500 calories have to go away to lose one pound.
If you lose 10 pounds then that is 35,000 calories. That is alot of whopping calories.
If you lose 20 pounds then it would mean you used up 70,000 calories or you consumed 70,000 calories less than normal.
So when you are examining the amount of weight you want to lose look at how many calories have to be expended. Either reduce the caloric intake or increase the activity.
Does this make sense? If you have any questions ask away. There is a whole host of people with tremendous wisdom on this thread!
Missy