"i was on yaz for almost a year. i gained 25 pounds and am heavier than i&#039;ve ever been in my life! i&#039;ve never, ever had a problem with weight gain before. after being on it for a couple months, i started getting weekly headaches. really bad ones. i decided to go off of yaz to see if the headaches would go away and i&#039;d stop gaining weight. sure enough, after about 2 weeks the headaches stopped completely. i haven&#039;t gained any more weight either, and i&#039;ve been off of yaz for about a year now. unfortunately, i&#039;m having problems losing all the weight i gained!"