Burger King’s same-store sales in the U.S. and Canada declined 4.6% in the three months ended Sept. 30, 2009. People 18 to 34 cut their consumption of fast-food meals from November 2006 to November 2009 according to the market-research firm NPD Group. The combination of the economy and better health information has influenced people to eat at home and to opt for leaner lower calorie foods.