After qualifying as a doctor, he was attached to the
Medical Research Council's (MRC) military personnel research programme, working under B.S. Platt, where he spent a year studying
heat stroke and
heat exhaustion in
Basra. After the
second world war had ended, Platt became the head of a new research unit at the MRC, focusing on nutrition and Waterlow followed him and worked with the unit. During this time, Platt imprinted the prediction on Waterlow that, "Nutrition will be the problem of the future". and the microbalance was sensitive to within one millionth of a gram. He was elected Fellow of the Royal Society in 1982. Whilst in the Caribbean he established 'The Tropical Metabolism Research Unit' at the
University of the West Indies in
Jamaica. ==Written work==