While<unk>  can be deadly over time, if the person is given medical treatment early enough, the effects of<unk>  can be reversed. However, the person may require intravenous nutrition, a blood transfusion, and/or oxygen replenishment. After that, it may be a few weeks to a few months before the person's muscle mass and fat deposits can build themselves up again; there is a possibility that they may never build back up, depending on the severity of the condition.
Catabolysis
Metabolism
Excretion
Redox
Reuptake
Drug metabolism
Ethanol metabolism
Drug recycling