Egg

Feel sunnier by adding a bit of yellow. Egg yolks contain choline, a mood enhancer. Being low on this nutrient could lead to feeling anxious. Yolks act as a multivitamin, delivering vitamins A and D, as well as folate and calcium. Dark chocolate is high in polyphenols, which are shown to improve cognitive function, said Pratt. Chocolate also contains phenylethylamines, a neurotransmitter that, in low levels, is associated with depression and in high levels can be associated with schizophrenia. Phenylethylamines work by releasing endorphins in the brain and promote feelings of attraction and giddiness.