When you find yourself eating something this way it usually means it contains something your body Really needs! Rhubarb is fairly high in Potassium and Calcium, but I wouldn't use it as a major source. Bananas and dark leafy greens, like mustard greens, seem safer bets.

I love Rhubarb too, but this is one of those plants you Can have too much of and some folks have even had reactions to eating stewed leaves. I suspect this might have been due to literally pigging out on them or something in the soil it was grown in though. Rhubarb seems to "pick up" and concentrate chemicals in poor soil or low water conditions.