Before choking down a quick bite, have a seat.  People who snack while sitting at a set table eat fewer calories in their next meal than people who are snacking on-the-go, according to a Canadian study.  Researchers served identical portions of soup with crackers, a sandwich, yogurt and fruit to study participants, who either ate while standing at a counter or at a cloth-covered table.  Those who were seated consumed a third less calories when returning for dinner.  When you feel like you are eating a formal meal, it makes you feel like you are eating more than you actually are, increasing your satiety levels, according to the study's author.