When we require extra energy from our bodies due to pressure at work and emotional stress, they use up their energy reserves, and as a result, vitamin B reserves, which in turn, makes us more susceptible to becoming depressed, suffering insomnia or irritability. To avoid this, your diet should include food sources rich in vitamin A, B and C, and minerals such as potassium, magnesium and calcium. You should also make a habit of exercising and doing lovely things that you enjoy to relax, like walking, speaking to loved ones on the phone, going to the cinema, etc.