Good mental health, to some extent, depends on your good physical health right now: so if you're feeling blue, you have to get active right away! When your blood is pumping those endorphins around your body, your mind starts to see things in a more positive and hopeful light. Diet is also an important consideration: avoid anything that makes you feel too bogged down today, and try not to eat on the go. Sit down and enjoy whatever meal you're eating.