I need 4 possible reasons for the trend toward a "snacking lifestyle."

Snacks were traditionally designed to assuage hunger in
between meals. However, a snacking lifestyle makes own think that the meal itself is
consumed quickly and not necessarily on nutritious foods. Perhaps one reason is because
it is available easily and needs little preparation.
Another reason is because of the taste;snack foods are
generally sweet, salty, rich in fats and therefore taste good to most
people. Busy lifestyles may be another reason for a
snacking lifestyle as people may not all be present in the household to sit down to a
traditional meal. It may also be less cost prohibitive to
eat meals that are snacks than a large, home-cooked traditional
meal.