Losing weight fast is generally not a great idea and attempts to do so very often backfire. The website docstoc.com points out that "According to The American College of Sports Medicine (ACSM) a healthy weight loss is 1-2 pounds per week." The only time it would be OK to exceed this amount and could work is if you are severely obese. When you are severely obese the pounds often come off fast because you have so many extra. It is still crucial, however, that you follow safe guidelines.
Shedding the Pounds
Visit your doctor for a full physical before you start any weight loss program. Start your diet and exercise plan only if he clears you. Continue seeing your doctor on a regular basis to make sure you are staying healthy while strenuously dieting and exercising.
Find a good licensed nutritionist to help you come up with a customized diet for you to follow during the three-month period. Do not just cut down on your calories to make your own diet.
Find a good certified trainer, preferably one with at least three years of experience, who can guide your exercise program. Interview several before you decide upon one. You will spend lots of time with this person--daily training sessions--so you need to like and feel motivated by him.
Follow the fitness professionals' recommendations and do not give up when it feels tough. Losing 80 pounds in three months is not an easy feat.