A bit of math
My body uses about 1500 calories a day for basic functions if I do absolutly nothing
If I take in only 500 calories a day, that provieds a 1000 calorie defeciet
3500 calories = 1 pound
At this rate, I will lose 1 lb every 3 1/2 days
I will lose about 10 lbs a month
I should reach my goal of 110 lbs in about 6-7 months...
I'm sure the number of calories used per day changes with weight loss, but it's a rough estimate