There is leptin resistance. The question, again, is why? And the way to think about it is it's sort of a sort of balance, right? So insulin, if you give people insulin, like if you think about causes of obesity, what causes people to gain weight? Well, if I give you insulin, you'll gain weight. If I give me insulin, I'll gain weight. So insulin causes weight gain, whereas leptin will cause the opposite. So it's sort of this seesaw. Body fat is nothing more or less than a store of energy, right? And you only store energy when your body tells you. Our entire body runs on hormones, right? Nothing happens without the hormonal system being activated. So insulin is pushing us to gain weight. Leptin is pushing us to lose weight. And what's happening is that one is sort of overcoming the other. Insulin is overcoming the leptin.存在瘦素抵抗。問題又來了,為什麼?思考這個問題的方法是,這是一種平衡,對嗎?所以胰島素,如果你給人們注射胰島素,就像如果你思考肥胖的原因,是什麼導致人們體重增加?如果我給你胰島素,你就會發胖。如果我給我注射胰島素,我的體重也會增加。所以胰島素會導致體重增加,而瘦素則相反。這就是蹺蹺板的原理。體脂只不過是一種能量儲存,對吧?只有當你的身體告訴你的時候,你才會儲存能量。我們的整個身體都是靠荷爾蒙運轉的,對吧?沒有荷爾蒙系統的激活,什麼都不會發生。所以胰島素會促使我們增重。瘦素促使我們減肥而現在的情況是,一種激