Over the past 4 years i've gained 80 pounds. i started taking birth control and dropped 70 pounds in 4 months. possible reasons?

A "wait loss" pill?: So, you think there is a correlation between the oral contraceptive pill and your 70 pound weight loss? Actually, there is no physiologic connection, however there are psychologic reasons for your situation, for the pill to be a "wait loss" pill. Some women worry about unprotected sex and eat more, or others want to "attract" more male interest and partners and then lose weight.