Prophylactic diet for the people working in microbiological industry exposed to the sensitizing action of microbiological synthesis products has been developed. The diet has been tested under the conditions of a prophylactic sanatorium. A protective effect of the diet has been observed manifest in the decrease of the state of sensitization, normalization of metabolic processes. It is recommended, that this kind of diet be used in the prophylactic sanatoria of the microbiological industry plants.