有趣
有個理論 ，set point 既 upper limit 係 base on 有冇被獵食既危險
所以 ...運動係刺激身體，話佢知唔好太肥否則會死 ?
Unlike the other models discussed,there is a strong evolutionary rationale to explain why such a system
might evolve, with the lowerintervention point defined by the risk of starvation and the upperintervention
point defined by the risk of predation (Speakman, 2007; Speakman, 2008). This model has the additional
benefit of providing a context of understanding the asymmetry of weight control. The lowerintervention
point explains why we are generally resistantto weightloss: as weightis lost, energy expenditure is reduced,
thereby preventing further weightloss. By contrast, variation in the upperintervention point explains why
some individuals are rather poor at defending against weight gain and therefore prone to becoming obese
when food is readily available, whereas others can resist weight gain in the face ofthe same environmental
stimuli. The source of individual variation in the upperintervention point has been a matter of debate
(Speakman, 2007; Speakman, 2008; Prentice et al., 2008). It has been suggested, based on numerous small
animal studies,thatthe upperintervention pointin most animals is probably regulated by the risk of
predation. In humans who developed tools and weapons, discovered fire and became social animals about 2
million years ago (Homo erectus),the risk of predation was effectively eliminated.
發表於 
返回列表
