It can, but in a roundabout way. Unlike calcium-rich foods, which can directly increase your blood levels of this mineral, there are no foods that can directly increase your body’s supply of serotonin. That said, there are foods and some nutrients that can increase levels of tryptophan, the amino acid from which serotonin is made.
Eating a carbohydrate-rich meal will have your body trigger a release of insulin. This in turn causes any amino acids in the blood to be absorbed into the body except for tryptophan. It remains in the bloodstream at high levels following a carbohydrate meal, which means it can freely enter the brain and cause serotonin levels to rise.
Getting an adequate supply of vitamin B-6, which can influence the rate at which tryptophan is converted to serotonin.
APA Reference
Psych Central. (2008). Frequently Asked Questions about Serotonin. Psych Central. Retrieved on March 9, 2014