Losing a few pounds net over a few days doesn't mean much.
It's absolutely impossible to measure a precise loss of one pound per day with casual measurements and a conventional bathroom scale. For one, your weight fluctuates much, much more than one pound per day. You can calculate a "true weight" with extremely careful measurement, noting when you measure, when you drink, when you eat, when you piss, when you shit, how much, etc. but even that isn't going to give you an indication of what's water weight, what's body fat and what's lean body mass. On top of all that, the precision of a typical bathroom scale is extremely low. All of that to say, there's no way that "one pound a day" means literally losing exactly one pound per day every day for 8 days.
On that sort of time scale, a sudden change in diet, for example to one that's lower in sodium, that results in lower water weight, or even hormonal fluctuations are much more likely, especially in the absence of severe illness or extreme exercise.
It's not evidence of anorexia or even unhealthy weight loss.