I have an IUD - but it is one that stops bleeding all together ( the mirena) - I too experienced a heavy bleed, out of the blue - a couple of weeks in to the Atkins diet...it is interesting to read similar reports. I am sure it is to do with hormone levels, because the other side effect for me has been my skin clearing up (I have acne rosacea). I am over the moon! I have come off the antibiotics - and as long as I keep to my lowcarb food - my skin is clear - naturally. I wish doctors would recommend it to all us 30 something women who suddenly get spotty, instead of putting us on antibiotics - it seems obvious to me now that it is insuliin levels affecting hormones, and in particular the production of testosterone. I want the world to know - it is such a simple, healthy cure!