Unless working from a diet and exercise plan approved by a doctor which says otherwise, 6 kilograms or 12 pounds is what you should be losign in that time.
It's impossible to lose 26 pounds in only 3 weeks and be safe about it. If you want to lose weight and keep it off, you need regular exercise and a reduced-calorie diet. There may be some fad diets out there that let you lose that much in only 3 weeks, but once you go back to eating normally, you'll gain all the weight back (or even more!).
To lose 15 pounds in 2 weeks would be not only impossible but nowhere near safe. That kind of weight loss would require a daily caloric deficit of 3,750, which would be extremely dangerous.
There are many factors involved. First of all, are you 25 pounds overweight? If you aren't, it would be dangerous to loose that much. If you work a safe diet and exercise plan, you should be able to lose 25 pounds in about six months. That is a rate of 1 pound every week. You are likely to lose more the first couple of weeks.
Safe weight loss is 1 to 2 pounds a week, so that would be 12 to 24 pounds in 12 weeks.
No, this is losing an average of 4.2 pounds a week. It is safe to lose 1 to 2 pounds a week. However, the more overweight you are the easier it is to lose weight. I myself lost between 3 and 4 pounds in a week at my heaviest just by cutting 750 calories a day and adding in some light exercise. It is best to consult a doctor if you plan to lose that much weight really quickly. The risk you take in losing it too quickly is saggy skin :(
2 lbs a week is safe. Any pounds beyond two will simply be water weight.
In two weeks, losing about 4lbs is safe. Losing more is not advised.
It is probably not safe to try and lose that much weight in so short a time. You can't gain it that fast, don't expect to lose it that fast. Eat sensibly and exercise. Ten pounds the first two weeks of a life style change is possible, but difficult.
There is not a safe way to lose that much that quickly. You didn't gain it that quickly, you can't lose it that quickly. In the first week you begin to exercise you should lose up to ten pounds, then every week after that you should lose 2-3 pounds, anything more is unhealthy, p.s. most diet pills contain afedrin, the main ingredient used to make speed
NO! 1-2 pounds per WEEK is a safe amount.
There is no safe way to lose that much weight that fast. Half that would be really pushing it. Two pounds a week is a reasonable amount. And if you lose 10% of your weight, it will be very noticeable.
It is extremely dangerous to try to lose that much weight in such a short period of time. The safe amount to lose is two pounds per week.