sweat a lot before then. you're body has more than 2 million sweat glands (the eccrine and the apocrine). sweat mostly contains sodium chloride and methylphenol, but it does also contain fatty material (which is why sweat stinks, not from the fatty material but from bacteria feasting on the fatty material), so get to a sauna sweat and drink lots of water. you will wash through your fatty tissue... called excretion.