800 cc saline implant - can my body take it?

Thank you for the question.
Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery (regarding breast implant type/size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully. Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining breast implant size/type/profile will most likely help achieve your goals.
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as “natural” or "C or D cup" etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup size may also be inaccurate.
3. Once you feel you have communicated your goals clearly, allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals, with safety and avoidance of complications being first priority. Again, in my practice, this decision is usually made during surgery ( after the use of temporary intraoperative sizers).
I hope this, and the attached link (dedicated to larger breast augmentation surgery concerns), helps. Best wishes.

If you really want 800 cc then that is what you should consider.  There are no rules regarding what will fit your body. Find a surgeon who has experience with all ranges of requests and all sizes of implants. The surgeon's own sense of aesthetic is not of any importance. It is your body. If you like the way the 800 cc implant looks then that is what you should be shooting for. On the other hand, if over and over you meet with plastic surgeons that express the same technical concerns about implant coverage then maybe you need to readjust your goals.