Is it possible to loose 80 pounds in 3 months?

It depends on the starting weight. It would be very easy for someone who was overweight by 100 pounds to lose that much without it being dangerous. For someone that is close to a good weight already it would be very hard. A pound a week is a pretty good rate, but the first couple of weeks could be a more.

In short, yes. Generally, it's considered safe to gain or lose no more than 2 pounds per week. So, 30 pounds would just be slightly over that. Gaining or losing weight beyond 2 pounds per week causes stress to the body, most dangerously, to the heart.

But this is a general answer for the average person. When planning large weight lossor gain, it's best to consult your doctor first as there may be factors specific to the person that may make such gain or loss dangerous.

It's also important to keep in mind that, in general, the faster you lose it, the faster you'll likely gain it back. Weight loss come as a natural result of a long-term lifestyle change in diet and exercise. Rapid weight-loss diets rarely last beyond the short-term.