One would be the NPY which stands for Neuropeptide Y,

其中之一是NPY 即神经肽Y
and the 5HT which is something

另一个就是5-羟色胺
that you will hear more of in the common language as serotonin.

你在学血清素的时候会听到这个词
It's very interesting

这两种物质对饮食的影响
how these two things affect--affect eating,

非常有趣
and the SSRI is the selective serotonin reuptake inhibitors

SSRI是选择性5羟色胺再吸收抑制剂
are a class of drugs mainly used for depression.

是一类主要用于治疗抑郁症的药物
Prozac and drugs like that are SSRI drugs.

百忧解和与其类似的药物就是SSRI
Those drugs, once they were discovered,

这些药物一经发现
the laboratory scientists found in the initial animal studies

就被科学家首先运用于动物实验
just looking at whether these drugs were safe or not

观察这些药物在动物中的安全性
for the health of the animals,

对健康是否有危害