1. Deep-sea fish: Research has found that people living by the sea around the world tend to be happier. This is not only because the sea is refreshing, but also because people living by the sea eat fish more often. A study from Harvard University points out that the Omega-3 fatty acids in sea fish have a similar effect to common antidepressants like lithium carbonate, as they can block nerve conduction pathways and increase serotonin secretion.
2. Bananas: Bananas contain a substance called alkaloids that can boost a person's spirits and confidence. Moreover, bananas are a source of tryptophan and Vitamin B6, both of which help the brain produce serotonin.
3. Grapefruit: The high amount of Vitamin C in grapefruit not only helps maintain the concentration of red blood cells and strengthens the body's immunity, but it is also a stress-reliever. Most importantly, Vitamin C is a key component in the production of dopamine and adrenaline.
4. Whole wheat bread: Carbohydrates can help increase serotonin. Researchers from the Massachusetts Institute of Technology say, "It's quite scientific for some people to regard foods like pasta and pastries as edible antidepressants."
5. Spinach: Researchers have found that a deficiency in folic acid can lead to a decrease in serotonin in the brain, causing depressive moods. Spinach is the most well-known ingredient rich in folic acid.
6. Cherries: Cherries are called "natural aspirin" by Western doctors. This is because cherries contain a substance called anthocyanin that can create happiness. Scientists at the University of Michigan in the U.S. believe that eating 20 cherries when feeling down is more effective than taking any medication.
7. Garlic: Although garlic may cause bad breath, it brings a good mood. A German study on garlic found that patients with anxiety disorders felt less tired and anxious, and were less prone to anger after taking garlic supplements.
8. Pumpkin: The reason pumpkin is associated with a good mood is that it is rich in Vitamin B6 and iron. Both of these nutrients help the body convert stored blood sugar into glucose, which is the brain's sole fuel.
9. Low-fat milk: A study by the Mount Sinai Medical Center in New York found that after women with premenstrual syndrome took 1000 mg of calcium supplements for three months, three-quarters of them felt happier and less tense, irritable, or anxious. In daily life, the best sources of calcium are milk, yogurt, and cheese. Fortunately, low-fat or skim milk contains the most calcium.
10. Chicken: After British psychologists gave participants 100 micrograms of selenium, they generally reported feeling better. Chicken is one of the rich sources of selenium.