I was a size two before Yaz, my appetite increased and I went to a size 12. I had no idea what was going on, I was always hungry and irritable. If my boyfriend left for work I would cry or if I didn't get my way I would throw temper tantrums. I would feel extreme nausea and migraines. I totally disregarded this, because it did make my period lighter. When I am not on birth control I have severe cramps and nausea. It is just something you have to ask yourself. cramps for a week, or extreme weight gain with the risk of heart disease and such. I took it for 5mos. and then I quit. my breast size went down 3 cup sizes and my weight is going back to normal without any physical activity. I feel happier, I have more energy, and I am not as hungry anymore.