[header] How to discipline yourself efficiently [title] Eat healthy : [step] This is a golden rule. Eat at least 5 fruits or vegetables a day and avoid fast food at all costs. Gather up all the food in your house that you like yet that you know is bad and burn it/throw it away. 
Even foods such as coffee and energy drinks which claim to help you will only worsen your mood and overall health. Avoid alcohol and cigarettes/illegal drugs are a no-go.