I plan most of my week's work meals on Sundays - shop and cook so I have good healthy things to eat while at work and then I'm not tempted to get take out or snack in a way that undermines my efforts.
If you have lunchtime access to a microwave getting in your veggie servings is easy as throwing a bag of Birdseye Steamfresh in the microwave - ready in minutes - 4 servings!!
I love to find healthy recipes or develop my own subs for less healthy ones. I try to keep processed foods out of our home and diet.
Whenver I feel like I'm not doing great I turn to the Biggest Loser and see what those people can accomplish and it helps get me back on track.
i love finding new healthy versions of recipes I love since I love to cook - I use eatingwell.com a lot for this and have made some great tasting foods.
I eat low carb so when I REALLY need some pasta I cook a whole spaghetti squash and use it as the base for my home made lo carb sauce - I can have as much as i want guilt free!
Find something you love to do - don't just exercise for the sake of it and you will find that activity comes easily. I LOVE yoga and can schedule three weekly sessions with no problem because it is something I really enjoy doing!