You actually can't once you have it.  I think she made up 90% of this.  I have lymphedema in my left leg due to a crushing injury years ago.  I manage it with compression wraps and exercise, but it will never go away because the lymphnodes are damaged in my leg.  If I eat a lot of salt in a day or haven't worked out in a while, the fluid starts to build up again.  Why anyone would voluntarily eat themselves to the point of having this problem, I will never understand.  I'd do anything to turn back time and prevent what happened to my leg.