Abstract: Explorers and members of the armed forces frequently have to make expeditions in to unknown and hostile country, where the opportunities for obtaining food are either limited or altogether absent. In such circumstances the expedition has to take with it sufficient food for its members. The planning and provision of the rations may make all the differences between the success or failure of the expedition or military operation. In 1920-1942 the food supply and health provision was acceptable among the soldiers of the Royal Hungarian Army and no signs of kidney diseases and nephrotic syndrome could be seen. In August 1942 in Russia the temperature was plus 41°C and in 1943 January it was and 41°C. May be that this indetermination in the temperature and starvation and undernutrition, accompanied with lack of fluids resulted in the greater frequency of the occurrence of kidney diseases and not punctually registered nephrotic syndrome among the soldiers of the Royal Hungarian Army. In almost a year of the eastern front the 2nd Army lost 125,000 men and dead, wounded or captured, only 70,000 returned.