Experts say the phrase "you are what you eat" applies to your state of mind.
The food that we eat contains nutrients which ultimately affect brain chemicals. And it's those brain chemicals, specifically the release of brain chemicals that can cause changes in our mood. So it's more than just calories, it can actually alter our brain chemistry.
So if you've been feeling blue or tired, look no further than what's on your plate. To ward off depression, omega 3 fatty acids keep symptoms at bay. The best source -- fatty fish like salmon or mackerel, or walnuts.
If it's concentration you're after, go for protein such as turkey, string cheese, beans or yogurt. Blueberries are also known to improve memory.
"Protein boosts levels of dopamine in the brain and that increases feelings of alertness, as well as concentration," Lisa Dreyer, Registered Dietitian.
Complex carbs boost energy. Try whole grain toast with peanut butter, a whole grain bagel, pretzels or yogurt.
If you want to relax or calm down, reach for sweet, starchy carbs such as low-fat cookies, pretzels, a granola bar or banana.
"The key is to not over-consume these sweet starchy foods. I say give yourself a calorie budget of 150 calories,” says Dreyer.
But overdoing it can leave you unhappy in the long run.
"Too much ice cream or candy can put us in a bad mood if it means we can no longer fit into our jeans or look good in our bathing suits," says Dryer.
And, we didn't forget you chocolate lovers. Research shows dark chocolate leads to euphoria.