Thescientificprincipleofwhyenergyrestrictioncanmakepeoplelivelongerisbasedonthegenesinthehumanbody.Thehumanbodyobtainsabout60trillioncellsfromparents,whichcontainalargeamountofgeneticinformation.Althoughpeoplesphysiquewillbesimilartothatoftheirparents,itdoesnotmeanthatchildrenwillbefatiftheirparentsarefat.Thisisbecausethestateandfunctionofgeneschangewiththeenvironment,andthefunctionswitchesonandoffsometimes,whichhasbeenconfirmedinexperimentsonidenticaltwins.Inotherwords,throughtheinterventionofdiet,exerciseandpsychologicalstate,theeffectofgeneswitchcanbeachieved.能量限制为何能让人更加长寿，其科学原理归根结底基于人体中的基因。人体从父母处获得的细胞约为60兆个，在这些细胞中都含有数量庞大的遗传信息。尽管人们的体质会类似父母体质，但这并不说明，父母都胖孩子就一定会胖。这是因为基因的状态和功能会随环境改变，基因上的功能开关也会时开时关，这一点在针对同卵双胞胎进行的实验中已经确认。也就是说，通过饮食、运动、心理状态各方面的干涉，能够达到控制基因开关的效果。Manystudieshaveshownthatregulareatingbroccoliandcabbagecanreducetheriskofgastriccancer,breastcancerandcolorectalcancer.Surprisingly,theactivesubstancesinthesevegetablesareneithervitaminsnorminerals,butaseriesof