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After you've been sitting awhile, it feels good to stand. Eventually your body aches to unfurl from the chair: Your muscles announce what they need loud and clear. It works on the flip side, too; when you've been standing for hours, your feet bark for a break. 久坐之后站起来的感觉非常良好。你的身体终于可以得到舒展，不再局限于狭小的椅子：你的肌肉大声而又清晰地表明它们想要什么。反过来，这也适用；站立几小时之后，你的双脚急需休息。 The same kind of internal cues can apply to eating. After weeks of holiday feasting it feels good - a relief, even - to eat lighter and more healthfully again. We've been eating for pure pleasure and may have gone a bit overboard, so our impulse is to counter with a punishing, hyper-strict diet. It's as if after binge-watching Netflix on the sofa all day, instead of getting up and enjoying a nice, juicy stretch or walk outside, we force ourselves to stand indefinitely in a corner facing the wall. 同样，这种体内机制也适用于饮食。一连几周的假日盛宴之后--清淡的、更为健康的饮食似乎能让你感觉更好，甚至有种如释重负的感觉。我们单纯地为了快乐而吃，而且还有点吃过头了，所以这样的冲动通常伴随着后期略带惩罚性质的严格饮食。就好比一整天窝在沙发上看电视，而非站起来好好享受身体的舒展或出去散散步，所以我们就强迫自己站在角落里面壁。 | 
