Healthy Weight Loss

In the long run, repeated episodes of unhealthy weight-loss attempts are more likely to cause damage to our body and outweigh the health benefits of short-term weight loss. That doesn't mean it's better to stay at an unhealthy weight. We just have to make sure that we are losing weight in a healthy way and are able to maintain that weight loss.
It takes about a 500-calorie deficit per day to lose about 1 pound per week. If you incorporate exercise that burns an additional 500 calories per day, then you can lose 2 pounds per week. My recommendation would be to aim to lose no more than 2 pounds per week on average. "On average" takes into consideration that the initial weeks may result in greater weight loss because of the loss of retained fluids from exchanging fatty, salty foods for a healthier, more balanced diet.
Overall, you should average out to about 2 pounds per week. If you are losing more than that, then you are more likely resorting to less-healthy methods of weight loss, which can hurt your metabolism and health in the long-term.