I got my first period after going vegetarian, however they were awful for many, many years. I never took any hormonal birth control for them either because I've always been scared of the long term effects. When I switched from regular tampons to organic cotton cloth pads, within 6 months, my periods were lighter and less painful. After going raw vegan, I've been, er, "caught by surprise" because I have not gotten any cramps, bloating, migraines... nothing and my periods only last a few days now. I think that's more on par with what nature intended and I think there is a direct correlation to animal product consumption and the chemicals in disposable sanitary products. I've heard a lot of speculation (though not seen any solid scientific evidence) that the more toxic your body is, the more you bleed and have pain due to the body trying to flush toxins through the menstrual blood. It makes sense, seeing as most women who improve diet and lifestyle have improvements in their periods.