Plus, soybeans are packed with folate, a natural mood booster that's been shown to increase serotonin levels and improve symptoms of depression.

此外，大豆还富含叶酸，叶酸是天然的情绪增进剂，它已被证明能提高人的血清素水平，改善抑郁症状。

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And the vitamin B6 in pineapple plays a part in converting tryptophan into serotonin in the brain for a natural mood booster.

菠萝中的维他命b6在将色氨酸转化为大脑中的血清素的过程中也发挥了作用，从而成为一种天然的情绪增进剂。

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