Snacking throughout the day is not a bad habit, so long as it's conducted in moderation and with healthy choices. Good-for-you snacks can be part of a healthy diet if snacking is done in a sensible way —hence not eating the entire bag of dark chocolate Hershey Kisses. The truth is what you snack on in between meals goes a long way, especially in keeping your metabolism burning. If you have a regular exercise routine, it can also help continue to tone your muscles throughout the day.