Tryptophan is an essential amino acid that ACTS as a precursor of serotonin - the feel-good chemical - and can be converted to melatonin, eliciting relaxation and pleasure.
If you're hungry, have a snack rich in carbohydrates, which trigger the release of the brain chemical serotonin, associated with relaxation.
如果真的很饿，吃些富含碳水化合物的小点心，可以触发大脑血清素的释放，这玩意有助放松身心。
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Firstly, according to medical research, when we exercise, our brains release certain chemical substances which bring feelings of happiness and relaxation.