既然引起食欲的许多原因还有待发现，就很难发明一种药物来抑制食欲。
It's hard to create a drug to suppress appetite when there could be many unknown factors involved in this instinct.
但是，长时间的高应激水平会导致皮质醇水平长期升高，这可能引起食欲增加，体重上升。
Over time, high stress levels lead to chronically elevated cortisol levels that can cause increased appetite and weight gain.
他们猜测可能是由于高蛋白食物能引起大脑产生降低食欲的激素。
They surmise that it may be because a high-protein diet causes the brain to receive lower levels of appetite-stimulating hormones.
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