That initial time frame when you go from aching to having more energy and starting to feel better, and also noticing clothes are starting to feel a bit looser, for me, was a motivating time. It felt good and I wanted it to feel even better. Keep it up, it does get even better.
One thing we do so we both eat better is to plan and prepare meals together. Can't always do that because of differing time schedules, but when we do we make it more than just a meal, but an activity we do together. It is fun, except for the cleanup, because I make a huge mess, both in the kitchen and on the deck where I grill a lot.