人体的各种活动,如把营养成分从简单的前体合成为新的细胞成分、肌肉收缩对外做功、皮层的思维活动、神经系统的兴奋和传导、腺体分泌、消化管和肾小管细胞各种物质的主动运转以及维持体温稳定等等,都需要能量.一个中等身材的成年男人,在基础条件下每分钟约需消耗1千卡的能量,即24小时约需消耗1,400千卡的能量.日常生活中,能量的消耗 Various activities of the human body, such as the synthesis of nutrients from simple precursors to new cellular components, muscle contraction to external work, cortical thinking activities, nervous system excitability and conduction, glandular secretion, digestive tract and tubular cells The active energy of the substance and the maintenance of body temperature stability, etc., require energy.A medium-sized adult man consumes about 1 kilocalorie per minute under basic conditions, which consumes about 1,400 kilocalories in 24 hours. Daily life, energy consumption