最终，下丘脑认为瘦素浓度的升高是正常的——此后就永远把因体重减轻而引起的瘦素下降误解为饥饿的信号。
Eventually the hypothalamus interprets theelevated level of leptin as normal--and forever after misreads thedrops in leptin caused by weight loss as a starvation signal.
这种现象为那么多体重减轻后最终又反弹的人提供了生物学的解释。
Thisphenomenon provides a biochemical explanation for why so many of thosewho lose weight end up putting it back on.
一般来讲，它们是为那些通过饮食及锻炼仍不能减轻体重和那些因为体重造成健康问题的人准备的。
They're generally reserved for people who haven't been able to lose weight through diet and exercise, and who have health problems because of their weight.
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