If you want to be healthier, reduce the barriers that you have in front of improving your health. Don’t keep junk food in the house. Cool your meals instead of going out to eat. Keep your workout clothes close to your bed and work out early in the day. Start off each day by eating healthy food for your first meal. Gain momentum by doing the right thing early and often…then you’ll be less likely to want to squander what you’ve already done as the day goes on.
Another way to think of this is that most of the time, we try to go the path of the least resistance. If there is an easier, more convenient option, we go with it. So make the healthier way the easier way and you will take that option/make that choice more often.