Losing 50 pounds in 1-2 weeks when your starting weight is 165-167 is pretty much impossible....here's why:
Your body requires a certain amount of calories to maintain it's current
weight (body weight in lbs x 15)...so if you were 165 pounds, that would be
165x15 = 2,475 calories/day.
To lose 1 pound you need to be in a deficit of 3,500 calories. So if
you ate 500 calories less than this 2,475 each day (1,975 cals/day) you would
lose 1 pound each week.
To lose 50 pounds in 2 weeks, or 25 pounds in 1 week, you'd need to be in a deficit of 25x3,500 = 87,500 calories.
If you ate nothing for 1 week, you would be in a deficit of 17,325 calories.
That still leaves you with : 87,500 - 17,325 = 70,175 calories left to burn.
The only other way to burn off these calories is with cardio. Cardio will burn on average 500 calories/hour...
Which means to burn off the remaining 70,175 calories in the week, you'd have to do cardio for 70,175/500 = 140.35 more hours or 5.8 days.
So....if you're willing to not eat anything for 1 week and live on a treadmill without sleep, you may be able to attain this goal...chances are you will kill yourself before that happens though...literally.
Best solution?
Be more realistic in your goals.
A good amount of weight loss is 1-2 pounds/week.
If you want to go to extremes, don't go lower than 1,200 calories/day and do 1 hour of cardio daily.
There's more detailed info on this all here...
