The possible benefits of an 'oligomolecular diet', consisting of a few fats whose mixture melts only just below the human core body-temperature, are further pursued this week. This time the problem to be tackled is obesity — by solidifying the fat in certain parts of the body with a cold pack, fat could be lost selectively from other parts. There may be drawbacks to this plan, but overweight DREADCO volunteers are now putting it to the test.