Check all the weight loss programs and you'll find they all list a special section on dining out.  It's tough to maintain healthy eating when eating on the go...and the challenge is there considering how often we visit restaurants...almost FIVE times a week!   The average U.S. adult eats 4.8 meals per week in restaurant. The LivingSocial "Dining Out" survey of consumer behavior, conducted last month among 4,000 online Americans by Mandala Research, found the most popular restaurant meal is lunch, with 2.6 meals eaten on average each week -- both carryout and dining -- followed by 1.4 sit-down dinners per week and .8 brunch or breakfast meals per week. Sixty-five percent say they favor Italian cuisine, 62 percent say Mexican, 59 percent say Chinese and 58 percent say pizza. When asked which new type of restaurant they'd most recently tried, Thai finished on top, beating out 25 other types of cuisine. (UPI)