| Description | Gives a detailed analysis of the question of diet and mental activity in view of current knowledge about the nervous system. Notes the general ignorance about the chemistry of the nervous system, hence the impossibility of determining the ration needed to maintain its full activity -- thinks that the energy used in nervous transmission must be very small -- but that the vascular richness of the grey matter suggests 'lively metabolism' -- though the overall need may be small. Notes that heavy mental activity is accompanied by increase of phosphates and sulphites in the urine, but that the thyroid manufactures 'nerve food' from an ordinary diet -- other observations. |