"Then go shopping to stock up on food selections that are good for you," advises Lona Sandon, a registered dietician at the University of Texas Southwestern Medical Center in Dallas.
"It's easier to stick to a healthy eating plan when you've got nutritious foods handy -- when it's easy to grab something nutritious and low-calorie, you're more likely to eat right."
Fresh fruits and vegetables, low-fat yogurt and milk, lean meats, whole-grain cereals and walnuts or almonds are healthy foods that can be eaten as snacks.
Sandon also advises to:
-- Eat a well-balanced diet, but eat in moderation because eating large portions of even healthy foods can prompt weight gain or prevent weight loss.
-- Exercise regularly so it becomes part of your normal daily routine. At least 30 minutes of vigorous physical activity each day is a good rule of thumb.
-- Get plenty of sleep.