How do you do THAT?

Those who drink 2-3 cups of coffee daily are less likely to experience depression and suicidal thoughts. This statement was made by researchers from the Harvard School of Public Health.

Chocolate also releases a form of opiate that elevates mood, and a small amount of a substance similar to marijuana.

"Given everything that's in chocolate, it's a wonder that law enforcement doesn't regulate its sale," the professor joked.

Nuts, eggs, milk. They produce the amino acid tryptophan, which promotes the production of the happiness hormone serotonin. Without enough tryptophan, people feel depressed and angry.

Nutmeg, saffron, fennel, dill, cinnamon, and anise. They have properties that are chemically similar to the psychedelic mescaline. In large quantities, spices can cause a feeling of euphoria.