Coca-Cola became one of the world's most powerful brands by equating its soft drinks with happiness. Now, for the first time, it's addressing a growing cloud over the industry: obesity. The US-based company on Monday will begin airing a twominute ad during the highestrated shows on CNN, Fox News and MSNBC in hopes of becoming a stronger voice in the debate over sodas and their impact on public health. The ad lays out Coca-Cola's record of providing drinks with fewer calories over the years and notes that weight gain is the result of consuming too many calories of any kind — not just soda.