In time of stress, food with high omega 3 fatty acids can greatly help. Salmon, tuna, walnuts, flax seed or fish oil are all good choices. Research has found that food with high omega 3 content can curb cortisol production. Folic acid, which is found in green vegetables, and vitamin B12 in lean meat can also help steady your mood. Folic acid creates dopamine, the happy hormone. Vitamin B12 gives a sense of calmness.