Possible, but not recommended. General weight loss recommendations that are doable w/o resorting to extreme diets is 2-4 lbs/week. As
You are not supposed to lose 23 pounds in one week. It is simply not possible.
You cannot lose 35 pounds of body fat in one week. It is not possible by any natural means.
You cannot lose 100 pounds in one week by any natural means. It is simply not possible.
Your sister cannot lose 30 pounds in one week. Other than surgical intervention, it is not possible.
If you mean 85 pounds of body weight, it is not possible to lose that amount in one week.
Unless you get gastric bypass you can't lose that much in one week. Even if you starve yourself.
That is not possible to do safely. One to two pounds a week is a realistic goal. 10 lbs a week is NOT.
No, you cannot lose 80 pounds in one week by any natural means.
You cannot lose 26 pounds in one week by any natural means.
It is impossible, by any natural means, to lose 94 pounds or anything like that in one week.
It is not possible to lose 50 pounds in one day. Even women who have just given birth, do not lose that much weight on one day. A healthy weight loss is one to two pounds per week.
Have a limb amputated. No really, you didn't gain 70 pounds in one week, how can you expect to lose it in one week? It would be aggressive to try and lose 70 pounds in 6 months. That would be 3 pounds a week and that is very hard!