German nutritionists say that eating chocolate can make people feel happy because chocolate releases serotonin in the brain. Complex amines are formed from tryptophan. The human body cannot produce it itself and can only rely on food ingested from the outside world. Chocolate itself is not high in tryptophan, but it does contain a lot of sugar, which can trigger the production of insulin. Insulin ensures that sugar enters the cells, and the remaining tryptophan enters the brain and is synthesized into serotonin. When serotonin stays in the brain synapses, it will have a positive impact on people's mood. In addition to chocolate, sweets such as bananas and pudding can also achieve this effect and help people get rid of depression