http://mma.sbnation.com/2011/8/12/2359094/weight-cutting-the-phantom-menace-of-mma Daniel Cormier, who just snuck into the SF Heavyweight Grand Prix tournament as an alternate replacing Alistair Overeem, had to miss his shot at Olympic gold in 2010 when his kidneys failed in Beijing. Cormier was cutting weight to compete at 211lbs. Now he's a permanently undersized heavyweight who doesn't dare try to make 205lbs because he doesn't dare push his kidneys again.
Cormier is no doubt familiar with the symptoms of Acute Renal Failure (ARF) like dry mouth, lack of urine, headache, lower back pain, nausea, and drowsiness. ARF can be treated with fluids and a quick rehydration, but it can also become Chronic Kidney Disease (CKD) if the fighter's kidneys give out from the strain.
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