Get out a calendar. Pick four small goals. I mean small goals. Like “Take a vitamin every day”. Write down one goal for each week. Commit to doing that one thing each week by using the calendar to schedule it in. Set reminders (e.g. using Outlook, Blackberry) each day to remind yourself of your week’s goal. I recommend:

-walk 10 min each day
-take a multivitamin every day
-eat one more helpful food serving (e.g. one vegetable) each day
-eat one less unhelpful food serving (e.g. one can of soda) each day