To avoid, you may do more regular exercises like cycling, ball games, swimming, yoga, etc. Besides, eat some food like bananas, chocolates, walnuts, and food that contains a lot of Vitamin B because these foods can keep your brain in balance. Depression can be due to the lack of a brain substance called 血清素. Try doing exercises and eat some healthy food, it may help you to regain the balance, get better and happier to face pressure.