Happy birthday Coca-Cola (NYSE:KO), 125 today. It was the world's most valuable brand last year...

Happy birthday Coca-Cola (NYSE:KO), 125 today. It was the world's most valuable brand last year but it faces a decline in its main market in the U.S. as Americans get more health conscious. Other challenges include driving sales in the world's fastest-growing major economies, and, like everyone else, coping with volatile commodity prices.