We all have heard it before: eating snacks between meals or eating 4-5 smaller meals is much healthier (and helps when you want to loose weight) than eating 3 big meals. So it comes down to making a good (healthy) choice when you eat a snack.
The healthy snacks include (naming just a few): yogurt (low-fat), fruits (apples, bananas, peaches, grapes, pears, plums, oranges, and watermelon), vegetables (carrots, broccoli, celery, tomato, green or red pepper, cauliflower), chicken soup, nuts, milk (low-fat) and whole wheat cereals.
However, you should watch how much of these snacks you eat and you should consider eating single servings of any snack. As you could see, a healthy snack can be anything, from fruits and veggies to dairy products.