Breast Reduction of 500 Grams Too Much for Dd Cups?

Not all D cup breasts are the same. In some this is due primarily to fat while in others it is due to gland. The latter is more dense and will weigh more for the same volume. Furthermore, the breasts can be shaped very differently. Frequently, women who have large breasts also have tissue that wraps around the chest to the back (bra strap roll) which can effect the overall appearance and volume of breast tissue removed. Discuss your concerns with your surgeon. He/she could easily modify and take out only 400. In any event this is just an estimate and is frequently adjusted intraoperatively. Of course, after surgery, you may fit into one brand's C cup while you fit into a different brand's D cup.

Hi,
It's hard to answer your question completely accurately. If you are truly a DD cup, a 500 gram reduction will likely place you somewhere in the C cup range; if you're closer to a D cup, you'll end up even smaller.
That being said, you'll probably derive significant benefit from reduction mammaplasty. If you're only 22, and having such significant problems with pain, breast reduction will likely make a huge difference in the quality of your life. It's hard to know without seeing pictures or examining you, but it's highly probable that you'll get a nice shape and lift to your breasts with a reduction.
Your best bet is consultation with a board-certified plastic surgeon. Best of luck!