I am a big believer in healthy snacking. Eat every two hours, just a little.
Instead of having junk snacks, snack on fresh fruit. It's portable, tasty, full of vitamins, low in calories and fat. And it’s accessible. You'll find fresh fruit almost everywhere.
Try an apple or orange, banana, pear, peach, grapes, kiwi, tangerine. Pay attention to what your body says you want or need. Many people tell me, "Fruit's more expensive." I say "Nonsense!" Compare prices of candy bars or chips with apples and oranges. I find them about the same. Besides, isn't your health worthy of a good investment?
One word of advice, though. It takes a few weeks for your body to get used to eating fruit for a snack if you've been a candy or junk food eater. Fruit is far subtler than a big sugar-jolt from candy. There's natural sugar in fruits (fructose), and that'll taste good and give you a little energy. Far better than the highly concentrated sugar found in candy and snack stuff.