Stay in relatively good shape year round and fight at a natural weight.
It's really not that difficult, lay off the junk food and have some self control. Cutting drastic amounts of weight really factors performance, testosterone, etc. 
easier said than done.
Rahjai MD - easier said than done.Why? Isn't this part of their job?
Rahjai MD - easier said than done.Excuses.
It's a pain in the ass, but I think the only reasonable way to remove weight cutting from the equation without making things more dangerous is to do random weighings, just like drugs tests, and prevent fighters from ever being more than X% above their weight limit.