Studies have shown that depression is associated with the concentration of 5-HT in the synaptic gap of the brain, which is a neurotransmitter synthesized by neurons in the brain using tryptophan as a precursor, and that neurons transmit happy messages through 5-HT so that people feel happy. Since tryptophan is an essential amino acid that cannot be synthesized in the body and can only be consumed through food, a diet rich in tryptophan can provide us with more raw materials to produce the pleasure transmitter. People need to consume 100 to 500 mg of tryptophan daily to meet their needs. What kinds of foods contain more tryptophan? The highest amount of tryptophan is found in flowering beans, which contain 986 mg of tryptophan per 100 grams. This is followed by millet, fish, milk, red meat, bananas, chocolate, and spinach, which are also foods rich in tryptophan. Therefore, it is important not to be partial to food, and the intake of a variety of foods is necessary for balanced nutrition. Of course, in addition to the tryptophan content, should be based on my other metabolic situation, choose to eat, do not be too partial. Some people have experienced fibromyalgia and eosinophilia after consuming tryptophan-rich supplements. This illustrates the possible adverse effects of deliberate consumption of supplements and suggests that life interventions can be made in a more natural way, such as through dietary therapy.