Report on the food requirements of brain workers Suggests that the 'brain worker' does not need more calories as 'the most careful experiments have failed to show any increase in the energy output of the body as a result of brain work' -- but that the diet must be of a better quality so that 'digestion does not make too great a call on the energies' -- suggests a diet of high protein to help keep the body warm. 4 January 1918