1. Mix it up! You need more than 40 different nutrients for good health, and no single food supplies them all. Every day eat some whole-grains, fruits, vegetables, dairy products; meat, poultry, and fish.
www.health.gov/dietaryguidelines/dga95/VARIETY.HTM

2. Ask your brain: "What’s a grain?” A grain is a part of a plant. Grains come from such plants as wheat, corn and oats. They’re used to make foods like bread and cereal. Oatmeal, rice and popcorn are grains, too. Foods that say “whole-grain” on them are best because they’re high in fiber and nutrients.
http://teamnutrition.usda.gov/resources/mpk1_lesson1.pdf and http://teamnutrition.usda.gov/resources/mpk3_lesson1.pdf

3. What’s the big deal about sugar and fat? If you eat foods with too much sugar and fat, you don’t have enough room to eat other foods that help you stay healthy and grow up strong. http://teamnutrition.usda.gov/resources/mpk1_lesson1.pdf

4. Mighty muscles. Protein helps your muscles get big and strong. Meat is a good source of protein. So are beans, nuts and seeds—add them to your salads and sandwiches! http://teamnutrition.usda.gov/resources/mpk1_lesson2.pdf and http://teamnutrition.usda.gov/resources/mpk3_lesson2.pdf

5. Be colorful when you eat. If you try to eat as many different-colored foods as possible, you’ll be more likely to get all the different vitamins you need. So munch on those strawberries, grapes, blueberries, broccoli and squash.
http://teamnutrition.usda.gov/resources/mpk3_lesson1.pdf

6. Rough it up! Just about everyone can use more fiber in their diets. Fiber is “rough stuff” found in the outer layers of plants. High-fiber foods make you feel fuller longer, and keep everything moving along in your digestive system. Which foods make the grade? Whole-grain breads, beans, fruits, vegetables and nuts.
http://www.ehealthmd.com/library/fiber/FIB_whatis.html

7. Think whole-grain bread is weird? An easy way to start liking it is by toasting it and adding a little jam. It gets nutty and sweet. Pretty soon you’ll think white bread is just plain boring!

8. Be lean at lunch. For lunch sandwiches, choose naturally low-fat options like turkey and chicken, or low-fat versions of normally high-fat meats such as salami, bologna and ham. http://familydoctor.org/297.xml

9. Add crunch to your lunch. Sandwiches have more “oomph” when they have vegetables in them (not to mention extra vitamins, minerals and fiber). Try different kinds of vegetables like lettuce, spinach, cucumber, carrots and green pepper.

10. Cruciferous vegetables rock!  You may never have heard of some of these champs (kohlrabi, daikon), but others may already be old friends (like broccoli and cauliflower). They are rich in nutrients and keep you healthy. Ask the chef in your family to cook up a new vegetable today. (Hint: ANYTHING tastes good stir-fried with a little olive oil, garlic and lemon.)
http://www.deliciousorganics.com

11. Your body loves green and orange things… Eat at least one dark green vegetable (broccoli, romaine lettuce, spinach) and one orange vegetable (carrots, sweet potatoes, squash) each day. They’re loaded with vitamins, minerals and fiber to keep you healthy and full of energy.
http://www.fruitsandveggiesmorematters.org/

12. If a baked sweet potato and a French Fry were going to have a contest to see who was healthier, which do you think would win? If you said the baked sweet potato, you’re right! It’s orange – which tells you it’s full of vitamins and minerals, plus it’s baked, not fried, so it’s lower in fat.
http://teamnutrition.usda.gov/resources/mpk3_lesson1.pdf

13. More fruits and veggies, please! According to the experts, many kids eat less than one serving of fruit a day and less than one serving of vegetables a day, when you should be aiming for five. So get busy!
www.obesity.org

14. You hear lots of talk about vitamins, but what exactly are they? Vitamins are tiny little substances found in food that make your body work properly. Different vitamins do all sorts of different jobs, from making your cells grow to helping you see in color instead of black and white.
www.mamashealth.com

15. Learn your ABCs! Vitamin A in carrots, cantaloupe and nectarines helps you see at night. B vitamins in leafy green vegetables, chicken and meat help your body make protein and energy. Vitamin C in oranges helps your body heal if you get a cut, and also helps you resist infections. Vitamin D in milk makes your bones stronger. http://www.kidshealth.org/kid/stay_healthy/food/vitamin.html

16. Move over, mayo. Regular mayonnaise has a lot of fat in it. Reach instead for light mayo, or even better, mustard. Try a new flavor, like honey mustard. 
http://www.health-fitness-tips.com/features/10-essential-health-tips.htm

17. Juice is good for you, right? Yes and no… While fruit juices contain essential nutrients, it’s easy to drink too much of them and not leave room for actual food. Get the benefits of juice by eating fruit and drinking water.  You’ll also get some fiber as an added bonus. http://pediatrics.about.com/cs/nutrition/a/fruit_juice.htm

18. Play with your food! Next time you have friends over, ask Mom or Dad to slice you up some carrot sticks, celery sticks, apples, bananas or other fruits and veggies, and put out a bowl of raisins, sunflower seeds or other small healthy items. Next, ask them to give you some low-fat cream cheese or yogurt. Your job? Build something cool with your “building” materials and “cement.” Then - eat it, of course!

19. Mix it up before dinner. Start each dinner with a mixed green salad. It’ll help reduce your appetite for more fattening foods and will automatically add vegetables to your meal.

20.For a healthy snack, go digging for bugs! Put a graham cracker in a plastic sandwich bag, seal it shut and crush the crackers into a fine “sand” using a large spoon. Then add raisins to the bag and dig for “bugs.” Other tasty “creepy crawlers” might include dried cranberries or fruit snacks. What other healthy snack can you think of that would make a good bug?

21. For better health, tell your parents to stick to the outside aisles of the supermarket, where you’ll find more “real” food (meats, dairy, produce) and fewer processed foods. http://www.rd.com/content/openContent.do?contentId=15959

22. The next time someone asks you “Do you want to supersize that?” say “No!” Huge portions of food can make you eat more than you should. So get to know what a sensible portion looks like. For example, a portion of fruit, veggies or pasta is about the size of a baseball. A portion of chicken or fish looks like a deck of cards.
www.Kidnetic.com

23.Score another point for breakfast! Kids who eat a healthy breakfast do a much better job of getting enough vitamins and keeping up their energy throughout the day. http://www.keepkidshealthy.com/nutrition/breakfast.html

24. Breakfast makes for better students! The State of Minnesota Breakfast Study showed that kids who eat breakfast do better at math and reading, visit the nurse less and behave better than kids who skip breakfast. http://www.keepkidshealthy.com/nutrition/breakfast.html

25. Hitting the vending machine for an after-school snack? Pretzels, nuts, trail mix, raisins,
and fat-free popcorn are healthier choices than candy, chips and cookies.
Variety of sources