- Eat more fruit. Add it to your cereal, your salads or even your dinners
- Sneak in more veggies. Add them wherever you can--a tomato on your sandwich, peppers on your pizza, or extra veggies in your pasta sauce. Keep pre-cut or canned/frozen veggies ready for quick snacks.
- Switch your salad dressing. If you eat full-fat dressing, switch to something lighter and you'll automatically eat less calories.
- Eat low-fat or fat-free dairy. Switching to skim milk or fat free yogurt is another simple way to eat less calories without having to change too much in your diet.
- Make some substitutes. Look through your cabinets or fridge and pick 3 foods you eat every day. Write down the nutritional content and, the next time you're at the store, find lower-calorie substitutes for just those 3 items.
source: exercise.about.com