Regardless of your age, it just makes sense to take a lunch along. Here are a few tips to make it healthy and increase the fun factor.

Bring a little extra to share.
Kids are 75% more likely to eat apples that have been peeled and sliced. Okay, so I made the percentage up. The point is, that even though the peel is reported to have nutritional value, if they just won't eat it, it's not going to be very nutritious! Find a way to make fruits and vegetables part of every meal.
Refill a bottled water container with milk or orange juice and freeze for one hour before leaving home.
Skip the paper sack, pack your lunch in a reusable mini-cooler or lunch box.
Whole wheat bread slathered in ketchup with a chunky slice of meatloaf makes a quick sandwich that will hold you through the day.
Check the salt content on chips. High salt consumption is possibly linked to decreased bone density, stomach cancer, hypertension, and asthma.
Their favorite salad dressing makes dipped raw veggies a treat for kids. Well, fine, it works for some, though.
Beware of white bread in disguise. The darker bread labeled "100% wheat" is not whole wheat bread.
What to drink? For those with no milk sensitivities, it's a great choice. Soda and fruit juice high in sugar will make you sluggish and cranky after a few hours. Orange juice is the most nutritious, followed by grapefruit juice (not high on the kid hit-parade!), then white grape juice.