Sea fish. The study found that people living by the sea all over the world are happier. This is not only because the sea is refreshing, but also because people who live by the sea eat fish more often. Studies have shown that omega-3 fatty acids in marine fish have similar effects with commonly used antidepressants such as lithium carbonate, which can block nerve conduction paths and increase the secretion of serotonin.

Bananas. Bananas contain a substance called alkaloids, which can boost people's spirit and confidence. Bananas are the source of tryptamine and vitamin B6, which can help the brain to make serotonin.

Grapefruit. The high content of vitamin C in grapefruit can not only maintain the concentration of red blood cells, but also make the body resistant. Vitamin C can also resist pressure. Most importantly, vitamin C is one of the important components that produce dopamine and adrenaline.

Whole wheat bread. Carbohydrates help to increase serotonin, and the researchers said: It is scientific for some people to regard foods such as pasta and snacks as edible antidepressants.