Woo, I wonder if you're getting enough protein. With that few calories, it might be hard. According to PPLP, you should be getting 80 to 100 grams of protein a day -- minimum.

Also, I take MSM (methylsulfonylmethane) daily for joint health. I tried glucosamin and condroitin, but they didn't help. I've noticed that MSM really does help. It's a sulfur supplement. Here's a link that describes it pretty well:

Why do we need MSM dietary sulfur supplements?