I can't get certain nutrients without supplementation. If I stop taking potassium, it's a guarantee that night time leg cramps will be sure to follow.

I eat my veggies, but not as regularly as I should. Today I had tons of salad and brocolli (I tend not to measure veggies, I just eat what I want). I take a multi & calcium, but I was on both of those before I started Atkins. YMMV, but I need supplements.