I'm so glad you mentioned the dark circles! I've noticed the same thing in my mirror and I've only been on Atkins for one week! This is the first time in my life that I've had them (except some bad days caused by over-partying in my much, much younger days). I drink lots of water (at least 10 8-oz glasses a day, usually more) per day. I'm thirsty, though, so drinking the water is easy. I'm taking the Atkins Basic 3 supplement. Maybe I should try a little extra Potassium. Who cares how thin I am if I look like I just stepped out of a boxing ring!