一个人每天所需要的能量，随着工作、学习的劳逸程度及时间的长短而不同，就热量的消耗来说，体力劳动者所需的热量应比脑力劳动者所需的热量为高。从目前我国人民的经济条件和膳食习惯来看，食物品种仍以粮谷类食物为主。体力劳动者可以多食糙米和粗面，以增加维生素B1的摄入 The amount of energy a person needs per day varies depending on the level of work and study, the amount of time spent, and the amount of heat consumed by manual workers, in terms of calorie expenditure, than the amount of heat required by mental workers. Judging from the current economic conditions and dietary habits of our people, food varieties are still dominated by cereals. Manual workers can eat more brown rice and rough, in order to increase the intake of vitamin B1