From a series of brain scans on volunteers, the researchers showed that a hunger hormone triggered activity in the brain that made people pay more for junk food than usual.

通过对志愿者大脑的观察，研究人员发现饥饿激素能够刺激大脑活动，人买的垃圾食品比平常要多。

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It also appears to lower levels of ghrelin, the 'hunger hormone', circulating in the digestive system.

同时人体中一种在消化系统循环中被称为“饥饿激素”的物质的水平也有明显的下降。

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These kinds of meals increase levels of leptin, a hormone that decreases hunger (and boosts fat burning) and lowers levels of ghrelin, a hormone that increases hunger.

这种食物增加了瘦素的含量，一种增加饥饿感的激素(增加脂肪燃烧)，同时减少了胃肽(一种增加饥饿感的激素)的含量。

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Bristol University research found that people who habitually slept just five hours each night had 15% more ghrelin, a hormone which increases feelings of hunger, than those who slept for eight hours.

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