饥饿是一种很强烈的生理感受，我们的身体很难忽视它。你是否经常刚吃完不久就饿了，越吃越多，根本停不下来？你知道饥饿感为何如此无穷无尽吗？
Hunger is complicated and can have many different triggers, said Dr. Monique Tello, a clinical instructor1 at Harvard Medical School, practicing physician and director of research and academic affairs for the healthy lifestyle program at Massachusetts General Hospital.
哈佛医学院临床讲师、执业医师、马萨诸塞州总医院健康生活方式项目研究和学术事务主任莫妮克·泰洛博士说，饥饿感的产生很复杂，可能有许多不同的诱因。
Medical reasons:
健康因素：
First, it's important to rule out any medical issues. Anybody who is feeling very hungry all of the time and isn't able to gain weight or is losing weight should see a doctor, Tello said.
首先，排除健康问题，这点很重要。泰洛说，如果一直感到非常饥饿，体重未增加或正在减轻，就应该去看医生。
Conditions that could cause constant or excessive hunger, also called polyphagia, include:
可能导致持续或过度饥饿的情况（也称为多食症）包括：
Hyperthyroidism: When the thyroid is overactive, a person's body and metabolism2 are "all revved3 up," Tello noted4. Besides being hungry, patients feel jittery5, shaky and their heart may be racing6.
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