Eating every few hours is a must when you're trying to drop pounds. It keeps hunger pangs at bay so you're not famished when you head into a meal, preventing you from inhaling way more calories than you normally would. Snacking also keeps blood sugar levels stable, so that low-energy, shaky feeling doesn't cause you to reach for a high-calorie pick-me-up. Eating often also keeps your metabolism going so you burn more calories all day long.
If you're trying to lose weight, it's important to stick to a snack that's 150 calories or less. Choose something that has both fiber and protein to fill you up, and avoid sugary, nutritionless foods. 150 calories might not seem like a lot, so in order for your brain to register that you're fueling up, eat your snack slowly. Make your snack last at least 15 minutes, and really savor each bite. Slowing down when eating your snack will help you feel satiated by the time you finish, which will prevent you from wanting to reach for more.